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Merge branch 'akpm' (patches from Andrew)

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Merge second set of updates from Andrew Morton:
 "More of MM"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (83 commits)
  mm/nommu.c: fix arithmetic overflow in __vm_enough_memory()
  mm/mmap.c: fix arithmetic overflow in __vm_enough_memory()
  vmstat: Reduce time interval to stat update on idle cpu
  mm/page_owner.c: remove unnecessary stack_trace field
  Documentation/filesystems/proc.txt: describe /proc/<pid>/map_files
  mm: incorporate read-only pages into transparent huge pages
  vmstat: do not use deferrable delayed work for vmstat_update
  mm: more aggressive page stealing for UNMOVABLE allocations
  mm: always steal split buddies in fallback allocations
  mm: when stealing freepages, also take pages created by splitting buddy page
  mincore: apply page table walker on do_mincore()
  mm: /proc/pid/clear_refs: avoid split_huge_page()
  mm: pagewalk: fix misbehavior of walk_page_range for vma(VM_PFNMAP)
  mempolicy: apply page table walker on queue_pages_range()
  arch/powerpc/mm/subpage-prot.c: use walk->vma and walk_page_vma()
  memcg: cleanup preparation for page table walk
  numa_maps: remove numa_maps->vma
  numa_maps: fix typo in gather_hugetbl_stats
  pagemap: use walk->vma instead of calling find_vma()
  clear_refs: remove clear_refs_private->vma and introduce clear_refs_test_walk()
  ...
This commit is contained in:
Linus Torvalds 2015-02-11 18:23:28 -08:00
commit 59d53737a8
116 changed files with 2503 additions and 1729 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
Documentation/cgroups/unified-hierarchy.txt
View File

@ -327,6 +327,85 @@ supported and the interface files "release_agent" and
- use_hierarchy is on by default and the cgroup file for the flag is
not created.
- The original lower boundary, the soft limit, is defined as a limit
that is per default unset. As a result, the set of cgroups that
global reclaim prefers is opt-in, rather than opt-out. The costs
for optimizing these mostly negative lookups are so high that the
implementation, despite its enormous size, does not even provide the
basic desirable behavior. First off, the soft limit has no
hierarchical meaning. All configured groups are organized in a
global rbtree and treated like equal peers, regardless where they
are located in the hierarchy. This makes subtree delegation
impossible. Second, the soft limit reclaim pass is so aggressive
that it not just introduces high allocation latencies into the
system, but also impacts system performance due to overreclaim, to
the point where the feature becomes self-defeating.
The memory.low boundary on the other hand is a top-down allocated
reserve. A cgroup enjoys reclaim protection when it and all its
ancestors are below their low boundaries, which makes delegation of
subtrees possible. Secondly, new cgroups have no reserve per
default and in the common case most cgroups are eligible for the
preferred reclaim pass. This allows the new low boundary to be
efficiently implemented with just a minor addition to the generic
reclaim code, without the need for out-of-band data structures and
reclaim passes. Because the generic reclaim code considers all
cgroups except for the ones running low in the preferred first
reclaim pass, overreclaim of individual groups is eliminated as
well, resulting in much better overall workload performance.
- The original high boundary, the hard limit, is defined as a strict
limit that can not budge, even if the OOM killer has to be called.
But this generally goes against the goal of making the most out of
the available memory. The memory consumption of workloads varies
during runtime, and that requires users to overcommit. But doing
that with a strict upper limit requires either a fairly accurate
prediction of the working set size or adding slack to the limit.
Since working set size estimation is hard and error prone, and
getting it wrong results in OOM kills, most users tend to err on the
side of a looser limit and end up wasting precious resources.
The memory.high boundary on the other hand can be set much more
conservatively. When hit, it throttles allocations by forcing them
into direct reclaim to work off the excess, but it never invokes the
OOM killer. As a result, a high boundary that is chosen too
aggressively will not terminate the processes, but instead it will
lead to gradual performance degradation. The user can monitor this
and make corrections until the minimal memory footprint that still
gives acceptable performance is found.
In extreme cases, with many concurrent allocations and a complete
breakdown of reclaim progress within the group, the high boundary
can be exceeded. But even then it's mostly better to satisfy the
allocation from the slack available in other groups or the rest of
the system than killing the group. Otherwise, memory.max is there
to limit this type of spillover and ultimately contain buggy or even
malicious applications.
- The original control file names are unwieldy and inconsistent in
many different ways. For example, the upper boundary hit count is
exported in the memory.failcnt file, but an OOM event count has to
be manually counted by listening to memory.oom_control events, and
lower boundary / soft limit events have to be counted by first
setting a threshold for that value and then counting those events.
Also, usage and limit files encode their units in the filename.
That makes the filenames very long, even though this is not
information that a user needs to be reminded of every time they type
out those names.
To address these naming issues, as well as to signal clearly that
the new interface carries a new configuration model, the naming
conventions in it necessarily differ from the old interface.
- The original limit files indicate the state of an unset limit with a
Very High Number, and a configured limit can be unset by echoing -1
into those files. But that very high number is implementation and
architecture dependent and not very descriptive. And while -1 can
be understood as an underflow into the highest possible value, -2 or
-10M etc. do not work, so it's not consistent.
memory.low, memory.high, and memory.max will use the string
"infinity" to indicate and set the highest possible value.
5. Planned Changes

23
Documentation/filesystems/proc.txt
View File

@ -42,6 +42,7 @@ Table of Contents
3.6 /proc/<pid>/comm & /proc/<pid>/task/<tid>/comm
3.7 /proc/<pid>/task/<tid>/children - Information about task children
3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file
3.9 /proc/<pid>/map_files - Information about memory mapped files
4 Configuring procfs
4.1 Mount options
@ -1763,6 +1764,28 @@ pair provide additional information particular to the objects they represent.
with TIMER_ABSTIME option which will be shown in 'settime flags', but 'it_value'
still exhibits timer's remaining time.
3.9 /proc/<pid>/map_files - Information about memory mapped files
---------------------------------------------------------------------
This directory contains symbolic links which represent memory mapped files
the process is maintaining. Example output:
| lr-------- 1 root root 64 Jan 27 11:24 333c600000-333c620000 -> /usr/lib64/ld-2.18.so
| lr-------- 1 root root 64 Jan 27 11:24 333c81f000-333c820000 -> /usr/lib64/ld-2.18.so
| lr-------- 1 root root 64 Jan 27 11:24 333c820000-333c821000 -> /usr/lib64/ld-2.18.so
| ...
| lr-------- 1 root root 64 Jan 27 11:24 35d0421000-35d0422000 -> /usr/lib64/libselinux.so.1
| lr-------- 1 root root 64 Jan 27 11:24 400000-41a000 -> /usr/bin/ls
The name of a link represents the virtual memory bounds of a mapping, i.e.
vm_area_struct::vm_start-vm_area_struct::vm_end.
The main purpose of the map_files is to retrieve a set of memory mapped
files in a fast way instead of parsing /proc/<pid>/maps or
/proc/<pid>/smaps, both of which contain many more records. At the same
time one can open(2) mappings from the listings of two processes and
comparing their inode numbers to figure out which anonymous memory areas
are actually shared.
------------------------------------------------------------------------------
Configuring procfs
------------------------------------------------------------------------------

12
Documentation/sysctl/vm.txt
View File

@ -555,12 +555,12 @@ this is causing problems for your system/application.
oom_dump_tasks
Enables a system-wide task dump (excluding kernel threads) to be
produced when the kernel performs an OOM-killing and includes such
information as pid, uid, tgid, vm size, rss, nr_ptes, swapents,
oom_score_adj score, and name. This is helpful to determine why the
OOM killer was invoked, to identify the rogue task that caused it,
and to determine why the OOM killer chose the task it did to kill.
Enables a system-wide task dump (excluding kernel threads) to be produced
when the kernel performs an OOM-killing and includes such information as
pid, uid, tgid, vm size, rss, nr_ptes, nr_pmds, swapents, oom_score_adj
score, and name. This is helpful to determine why the OOM killer was
invoked, to identify the rogue task that caused it, and to determine why
the OOM killer chose the task it did to kill.
If this is set to zero, this information is suppressed. On very
large systems with thousands of tasks it may not be feasible to dump

8
Documentation/vm/pagemap.txt
View File

@ -62,6 +62,8 @@ There are three components to pagemap:
20. NOPAGE
21. KSM
22. THP
23. BALLOON
24. ZERO_PAGE
Short descriptions to the page flags:
@ -102,6 +104,12 @@ Short descriptions to the page flags:
22. THP
contiguous pages which construct transparent hugepages
23. BALLOON
balloon compaction page
24. ZERO_PAGE
zero page for pfn_zero or huge_zero page
[IO related page flags]
1. ERROR IO error occurred
3. UPTODATE page has up-to-date data

2
arch/alpha/include/asm/pgtable.h
View File

@ -45,7 +45,7 @@ struct vm_area_struct;
#define PTRS_PER_PMD (1UL << (PAGE_SHIFT-3))
#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-3))
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
/* Number of pointers that fit on a page: this will go away. */
#define PTRS_PER_PAGE (1UL << (PAGE_SHIFT-3))

2
arch/arc/include/asm/pgtable.h
View File

@ -211,7 +211,7 @@
* No special requirements for lowest virtual address we permit any user space
* mapping to be mapped at.
*/
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
/****************************************************************

2
arch/arm/include/asm/pgtable-2level.h
View File

@ -10,6 +10,8 @@
#ifndef _ASM_PGTABLE_2LEVEL_H
#define _ASM_PGTABLE_2LEVEL_H
#define __PAGETABLE_PMD_FOLDED
/*
* Hardware-wise, we have a two level page table structure, where the first
* level has 4096 entries, and the second level has 256 entries. Each entry

2
arch/arm/include/asm/pgtable-nommu.h
View File

@ -85,7 +85,7 @@ extern unsigned int kobjsize(const void *objp);
#define VMALLOC_START 0UL
#define VMALLOC_END 0xffffffffUL
#define FIRST_USER_ADDRESS (0)
#define FIRST_USER_ADDRESS 0UL
#include <asm-generic/pgtable.h>

6
arch/arm/mm/hugetlbpage.c
View File

@ -36,12 +36,6 @@
* of type casting from pmd_t * to pte_t *.
*/
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
int write)
{
return ERR_PTR(-EINVAL);
}
int pud_huge(pud_t pud)
{
return 0;

4
arch/arm/mm/pgd.c
View File

@ -97,6 +97,7 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
no_pte:
pmd_free(mm, new_pmd);
mm_dec_nr_pmds(mm);
no_pmd:
pud_free(mm, new_pud);
no_pud:
@ -130,9 +131,11 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd_base)
pte = pmd_pgtable(*pmd);
pmd_clear(pmd);
pte_free(mm, pte);
atomic_long_dec(&mm->nr_ptes);
no_pmd:
pud_clear(pud);
pmd_free(mm, pmd);
mm_dec_nr_pmds(mm);
no_pud:
pgd_clear(pgd);
pud_free(mm, pud);
@ -152,6 +155,7 @@ no_pgd:
pmd = pmd_offset(pud, 0);
pud_clear(pud);
pmd_free(mm, pmd);
mm_dec_nr_pmds(mm);
pgd_clear(pgd);
pud_free(mm, pud);
}

2
arch/arm64/include/asm/pgtable.h
View File

@ -45,7 +45,7 @@
#define vmemmap ((struct page *)(VMALLOC_END + SZ_64K))
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#ifndef __ASSEMBLY__
extern void __pte_error(const char *file, int line, unsigned long val);

6
arch/arm64/mm/hugetlbpage.c
View File

@ -38,12 +38,6 @@ int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
}
#endif
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
int write)
{
return ERR_PTR(-EINVAL);
}
int pmd_huge(pmd_t pmd)
{
return !(pmd_val(pmd) & PMD_TABLE_BIT);

2
arch/avr32/include/asm/pgtable.h
View File

@ -30,7 +30,7 @@
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#ifndef __ASSEMBLY__
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];

2
arch/cris/include/asm/pgtable.h
View File

@ -67,7 +67,7 @@ extern void paging_init(void);
*/
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
/* zero page used for uninitialized stuff */
#ifndef __ASSEMBLY__

2
arch/frv/include/asm/pgtable.h
View File

@ -140,7 +140,7 @@ extern unsigned long empty_zero_page;
#define PTRS_PER_PTE 4096
#define USER_PGDS_IN_LAST_PML4 (TASK_SIZE / PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
#define KERNEL_PGD_PTRS (PTRS_PER_PGD - USER_PGD_PTRS)

2
arch/hexagon/include/asm/pgtable.h
View File

@ -171,7 +171,7 @@ extern unsigned long _dflt_cache_att;
extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* located in head.S */
/* Seems to be zero even in architectures where the zero page is firewalled? */
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define pte_special(pte) 0
#define pte_mkspecial(pte) (pte)

2
arch/ia64/include/asm/pgtable.h
View File

@ -127,7 +127,7 @@
#define PTRS_PER_PGD_SHIFT PTRS_PER_PTD_SHIFT
#define PTRS_PER_PGD (1UL << PTRS_PER_PGD_SHIFT)
#define USER_PTRS_PER_PGD (5*PTRS_PER_PGD/8) /* regions 0-4 are user regions */
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
/*
* All the normal masks have the "page accessed" bits on, as any time

6
arch/ia64/mm/hugetlbpage.c
View File

@ -114,12 +114,6 @@ int pud_huge(pud_t pud)
return 0;
}
struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd, int write)
{
return NULL;
}
void hugetlb_free_pgd_range(struct mmu_gather *tlb,
unsigned long addr, unsigned long end,
unsigned long floor, unsigned long ceiling)

2
arch/m32r/include/asm/pgtable.h
View File

@ -53,7 +53,7 @@ extern unsigned long empty_zero_page[1024];
#define PGDIR_MASK (~(PGDIR_SIZE - 1))
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#ifndef __ASSEMBLY__
/* Just any arbitrary offset to the start of the vmalloc VM area: the

2
arch/m68k/include/asm/pgtable_mm.h
View File

@ -66,7 +66,7 @@
#define PTRS_PER_PGD 128
#endif
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
/* Virtual address region for use by kernel_map() */
#ifdef CONFIG_SUN3

6
arch/metag/mm/hugetlbpage.c
View File

@ -94,12 +94,6 @@ int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
return 0;
}
struct page *follow_huge_addr(struct mm_struct *mm,
unsigned long address, int write)
{
return ERR_PTR(-EINVAL);
}
int pmd_huge(pmd_t pmd)
{
return pmd_page_shift(pmd) > PAGE_SHIFT;

4
arch/microblaze/include/asm/pgtable.h
View File

@ -61,6 +61,8 @@ extern int mem_init_done;
#include <asm-generic/4level-fixup.h>
#define __PAGETABLE_PMD_FOLDED
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
@ -70,7 +72,7 @@ extern int mem_init_done;
#include <asm/mmu.h>
#include <asm/page.h>
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
extern unsigned long va_to_phys(unsigned long address);
extern pte_t *va_to_pte(unsigned long address);

2
arch/mips/include/asm/pgtable-32.h
View File

@ -57,7 +57,7 @@ extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define VMALLOC_START MAP_BASE

8
arch/mips/mm/gup.c
View File

@ -301,11 +301,9 @@ slow_irqon:
start += nr << PAGE_SHIFT;
pages += nr;
down_read(&mm->mmap_sem);
ret = get_user_pages(current, mm, start,
(end - start) >> PAGE_SHIFT,
write, 0, pages, NULL);
up_read(&mm->mmap_sem);
ret = get_user_pages_unlocked(current, mm, start,
(end - start) >> PAGE_SHIFT,
write, 0, pages);
/* Have to be a bit careful with return values */
if (nr > 0) {

18
arch/mips/mm/hugetlbpage.c
View File

@ -68,12 +68,6 @@ int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
return 0;
}
struct page *
follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
{
return ERR_PTR(-EINVAL);
}
int pmd_huge(pmd_t pmd)
{
return (pmd_val(pmd) & _PAGE_HUGE) != 0;
@ -83,15 +77,3 @@ int pud_huge(pud_t pud)
{
return (pud_val(pud) & _PAGE_HUGE) != 0;
}
struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
{
struct page *page;
page = pte_page(*(pte_t *)pmd);
if (page)
page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT);
return page;
}

2
arch/mn10300/include/asm/pgtable.h
View File

@ -65,7 +65,7 @@ extern void paging_init(void);
#define PGDIR_MASK (~(PGDIR_SIZE - 1))
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
#define KERNEL_PGD_PTRS (PTRS_PER_PGD - USER_PGD_PTRS)

2
arch/nios2/include/asm/pgtable.h
View File

@ -24,7 +24,7 @@
#include <asm/pgtable-bits.h>
#include <asm-generic/pgtable-nopmd.h>
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE
#define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1)

2
arch/openrisc/include/asm/pgtable.h
View File

@ -77,7 +77,7 @@ extern void paging_init(void);
*/
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
/*
* Kernels own virtual memory area.

2
arch/parisc/include/asm/pgtable.h
View File

@ -134,7 +134,7 @@ extern void purge_tlb_entries(struct mm_struct *, unsigned long);
* pgd entries used up by user/kernel:
*/
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
/* NB: The tlb miss handlers make certain assumptions about the order */
/* of the following bits, so be careful (One example, bits 25-31 */

2
arch/powerpc/include/asm/pgtable-ppc32.h
View File

@ -45,7 +45,7 @@ extern int icache_44x_need_flush;
#define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT))
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define pte_ERROR(e) \
pr_err("%s:%d: bad pte %llx.\n", __FILE__, __LINE__, \

2
arch/powerpc/include/asm/pgtable-ppc64.h
View File

@ -12,7 +12,7 @@
#endif
#include <asm/barrier.h>
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
/*
* Size of EA range mapped by our pagetables.

8
arch/powerpc/mm/hugetlbpage.c
View File

@ -714,6 +714,14 @@ follow_huge_pmd(struct mm_struct *mm, unsigned long address,
return NULL;
}
struct page *
follow_huge_pud(struct mm_struct *mm, unsigned long address,
pud_t *pud, int write)
{
BUG();
return NULL;
}
static unsigned long hugepte_addr_end(unsigned long addr, unsigned long end,
unsigned long sz)
{

6
arch/powerpc/mm/subpage-prot.c
View File

@ -134,7 +134,7 @@ static void subpage_prot_clear(unsigned long addr, unsigned long len)
static int subpage_walk_pmd_entry(pmd_t *pmd, unsigned long addr,
unsigned long end, struct mm_walk *walk)
{
struct vm_area_struct *vma = walk->private;
struct vm_area_struct *vma = walk->vma;
split_huge_page_pmd(vma, addr, pmd);
return 0;
}
@ -163,9 +163,7 @@ static void subpage_mark_vma_nohuge(struct mm_struct *mm, unsigned long addr,
if (vma->vm_start >= (addr + len))
break;
vma->vm_flags |= VM_NOHUGEPAGE;
subpage_proto_walk.private = vma;
walk_page_range(vma->vm_start, vma->vm_end,
&subpage_proto_walk);
walk_page_vma(vma, &subpage_proto_walk);
vma = vma->vm_next;
}
}

2
arch/s390/include/asm/pgtable.h
View File

@ -99,7 +99,7 @@ extern unsigned long zero_page_mask;
#endif /* CONFIG_64BIT */
#define PTRS_PER_PGD 2048
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define pte_ERROR(e) \
printk("%s:%d: bad pte %p.\n", __FILE__, __LINE__, (void *) pte_val(e))

6
arch/s390/mm/gup.c
View File

@ -235,10 +235,8 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
/* Try to get the remaining pages with get_user_pages */
start += nr << PAGE_SHIFT;
pages += nr;
down_read(&mm->mmap_sem);
ret = get_user_pages(current, mm, start,
nr_pages - nr, write, 0, pages, NULL);
up_read(&mm->mmap_sem);
ret = get_user_pages_unlocked(current, mm, start,
nr_pages - nr, write, 0, pages);
/* Have to be a bit careful with return values */
if (nr > 0)
ret = (ret < 0) ? nr : ret + nr;

20
arch/s390/mm/hugetlbpage.c
View File

@ -192,12 +192,6 @@ int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
return 0;
}
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
int write)
{
return ERR_PTR(-EINVAL);
}
int pmd_huge(pmd_t pmd)
{
if (!MACHINE_HAS_HPAGE)
@ -210,17 +204,3 @@ int pud_huge(pud_t pud)
{
return 0;
}
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmdp, int write)
{
struct page *page;
if (!MACHINE_HAS_HPAGE)
return NULL;
page = pmd_page(*pmdp);
if (page)
page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT);
return page;
}

2
arch/score/include/asm/pgtable.h
View File

@ -27,7 +27,7 @@ extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
#define PTRS_PER_PTE 1024
#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define VMALLOC_START (0xc0000000UL)

2
arch/sh/include/asm/pgtable.h
View File

@ -62,7 +62,7 @@ static inline unsigned long long neff_sign_extend(unsigned long val)
/* Entries per level */
#define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE))
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define PHYS_ADDR_MASK29 0x1fffffff
#define PHYS_ADDR_MASK32 0xffffffff

6
arch/sh/mm/gup.c
View File

@ -257,10 +257,8 @@ slow_irqon:
start += nr << PAGE_SHIFT;
pages += nr;
down_read(&mm->mmap_sem);
ret = get_user_pages(current, mm, start,
(end - start) >> PAGE_SHIFT, write, 0, pages, NULL);
up_read(&mm->mmap_sem);
ret = get_user_pages_unlocked(current, mm, start,
(end - start) >> PAGE_SHIFT, write, 0, pages);
/* Have to be a bit careful with return values */
if (nr > 0) {

12
arch/sh/mm/hugetlbpage.c
View File

@ -67,12 +67,6 @@ int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
return 0;
}
struct page *follow_huge_addr(struct mm_struct *mm,
unsigned long address, int write)
{
return ERR_PTR(-EINVAL);
}
int pmd_huge(pmd_t pmd)
{
return 0;
@ -82,9 +76,3 @@ int pud_huge(pud_t pud)
{
return 0;
}
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
{
return NULL;
}

5
arch/sparc/include/asm/pgtable_32.h
View File

@ -44,7 +44,7 @@ unsigned long __init bootmem_init(unsigned long *pages_avail);
#define PTRS_PER_PMD SRMMU_PTRS_PER_PMD
#define PTRS_PER_PGD SRMMU_PTRS_PER_PGD
#define USER_PTRS_PER_PGD PAGE_OFFSET / SRMMU_PGDIR_SIZE
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define PTE_SIZE (PTRS_PER_PTE*4)
#define PAGE_NONE SRMMU_PAGE_NONE
@ -102,7 +102,8 @@ extern unsigned long empty_zero_page;
*/
static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value)
{
__asm__ __volatile__("swap [%2], %0" : "=&r" (value) : "0" (value), "r" (addr));
__asm__ __volatile__("swap [%2], %0" :
"=&r" (value) : "0" (value), "r" (addr) : "memory");
return value;
}

2
arch/sparc/include/asm/pgtable_64.h
View File

@ -93,7 +93,7 @@ bool kern_addr_valid(unsigned long addr);
#define PTRS_PER_PGD (1UL << PGDIR_BITS)
/* Kernel has a separate 44bit address space. */
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define pmd_ERROR(e) \
pr_err("%s:%d: bad pmd %p(%016lx) seen at (%pS)\n", \

6
arch/sparc/mm/gup.c
View File

@ -249,10 +249,8 @@ slow:
start += nr << PAGE_SHIFT;
pages += nr;
down_read(&mm->mmap_sem);
ret = get_user_pages(current, mm, start,
(end - start) >> PAGE_SHIFT, write, 0, pages, NULL);
up_read(&mm->mmap_sem);
ret = get_user_pages_unlocked(current, mm, start,
(end - start) >> PAGE_SHIFT, write, 0, pages);
/* Have to be a bit careful with return values */
if (nr > 0) {

12
arch/sparc/mm/hugetlbpage.c
View File

@ -215,12 +215,6 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
return entry;
}
struct page *follow_huge_addr(struct mm_struct *mm,
unsigned long address, int write)
{
return ERR_PTR(-EINVAL);
}
int pmd_huge(pmd_t pmd)
{
return 0;
@ -230,9 +224,3 @@ int pud_huge(pud_t pud)
{
return 0;
}
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
{
return NULL;
}

2
arch/tile/include/asm/pgtable.h
View File

@ -67,7 +67,7 @@ extern void pgtable_cache_init(void);
extern void paging_init(void);
extern void set_page_homes(void);
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define _PAGE_PRESENT HV_PTE_PRESENT
#define _PAGE_HUGE_PAGE HV_PTE_PAGE

28
arch/tile/mm/hugetlbpage.c
View File

@ -150,12 +150,6 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
return NULL;
}
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
int write)
{
return ERR_PTR(-EINVAL);
}
int pmd_huge(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_HUGE_PAGE);
@ -166,28 +160,6 @@ int pud_huge(pud_t pud)
return !!(pud_val(pud) & _PAGE_HUGE_PAGE);
}
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
{
struct page *page;
page = pte_page(*(pte_t *)pmd);
if (page)
page += ((address & ~PMD_MASK) >> PAGE_SHIFT);
return page;
}
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
pud_t *pud, int write)
{
struct page *page;
page = pte_page(*(pte_t *)pud);
if (page)
page += ((address & ~PUD_MASK) >> PAGE_SHIFT);
return page;
}
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
{
return 0;

2
arch/um/include/asm/pgtable-2level.h
View File

@ -23,7 +23,7 @@
#define PTRS_PER_PTE 1024
#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
#define PTRS_PER_PGD 1024
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define pte_ERROR(e) \
printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \

2
arch/um/include/asm/pgtable-3level.h
View File

@ -41,7 +41,7 @@
#endif
#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define pte_ERROR(e) \
printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \

3
arch/unicore32/mm/pgd.c
View File

@ -69,6 +69,7 @@ pgd_t *get_pgd_slow(struct mm_struct *mm)
no_pte:
pmd_free(mm, new_pmd);
mm_dec_nr_pmds(mm);
no_pmd:
free_pages((unsigned long)new_pgd, 0);
no_pgd:
@ -96,7 +97,9 @@ void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd)
pte = pmd_pgtable(*pmd);
pmd_clear(pmd);
pte_free(mm, pte);
atomic_long_dec(&mm->nr_ptes);
pmd_free(mm, pmd);
mm_dec_nr_pmds(mm);
free:
free_pages((unsigned long) pgd, 0);
}

2
arch/x86/include/asm/pgtable_types.h
View File

@ -4,7 +4,7 @@
#include <linux/const.h>
#include <asm/page_types.h>
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define _PAGE_BIT_PRESENT 0 /* is present */
#define _PAGE_BIT_RW 1 /* writeable */

9
arch/x86/mm/gup.c
View File

@ -172,7 +172,7 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end,
*/
if (pmd_none(pmd) || pmd_trans_splitting(pmd))
return 0;
if (unlikely(pmd_large(pmd))) {
if (unlikely(pmd_large(pmd) || !pmd_present(pmd))) {
/*
* NUMA hinting faults need to be handled in the GUP
* slowpath for accounting purposes and so that they
@ -388,10 +388,9 @@ slow_irqon:
start += nr << PAGE_SHIFT;
pages += nr;
down_read(&mm->mmap_sem);
ret = get_user_pages(current, mm, start,
(end - start) >> PAGE_SHIFT, write, 0, pages, NULL);
up_read(&mm->mmap_sem);
ret = get_user_pages_unlocked(current, mm, start,
(end - start) >> PAGE_SHIFT,
write, 0, pages);
/* Have to be a bit careful with return values */
if (nr > 0) {

20
arch/x86/mm/hugetlbpage.c
View File

@ -52,23 +52,17 @@ int pud_huge(pud_t pud)
return 0;
}
struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
{
return NULL;
}
#else
struct page *
follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
{
return ERR_PTR(-EINVAL);
}
/*
* pmd_huge() returns 1 if @pmd is hugetlb related entry, that is normal
* hugetlb entry or non-present (migration or hwpoisoned) hugetlb entry.
* Otherwise, returns 0.
*/
int pmd_huge(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_PSE);
return !pmd_none(pmd) &&
(pmd_val(pmd) & (_PAGE_PRESENT|_PAGE_PSE)) != _PAGE_PRESENT;
}
int pud_huge(pud_t pud)

14
arch/x86/mm/pgtable.c
View File

@ -190,7 +190,7 @@ void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
#endif /* CONFIG_X86_PAE */
static void free_pmds(pmd_t *pmds[])
static void free_pmds(struct mm_struct *mm, pmd_t *pmds[])
{
int i;
@ -198,10 +198,11 @@ static void free_pmds(pmd_t *pmds[])
if (pmds[i]) {
pgtable_pmd_page_dtor(virt_to_page(pmds[i]));
free_page((unsigned long)pmds[i]);
mm_dec_nr_pmds(mm);
}
}
static int preallocate_pmds(pmd_t *pmds[])
static int preallocate_pmds(struct mm_struct *mm, pmd_t *pmds[])
{
int i;
bool failed = false;
@ -215,11 +216,13 @@ static int preallocate_pmds(pmd_t *pmds[])
pmd = NULL;
failed = true;
}
if (pmd)
mm_inc_nr_pmds(mm);
pmds[i] = pmd;
}
if (failed) {
free_pmds(pmds);
free_pmds(mm, pmds);
return -ENOMEM;
}
@ -246,6 +249,7 @@ static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
paravirt_release_pmd(pgd_val(pgd) >> PAGE_SHIFT);
pmd_free(mm, pmd);
mm_dec_nr_pmds(mm);
}
}
}
@ -283,7 +287,7 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
mm->pgd = pgd;
if (preallocate_pmds(pmds) != 0)
if (preallocate_pmds(mm, pmds) != 0)
goto out_free_pgd;
if (paravirt_pgd_alloc(mm) != 0)
@ -304,7 +308,7 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
return pgd;
out_free_pmds:
free_pmds(pmds);
free_pmds(mm, pmds);
out_free_pgd:
free_page((unsigned long)pgd);
out:

2
arch/xtensa/include/asm/pgtable.h
View File

@ -57,7 +57,7 @@
#define PTRS_PER_PGD 1024
#define PGD_ORDER 0
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define FIRST_USER_ADDRESS 0UL
#define FIRST_USER_PGD_NR (FIRST_USER_ADDRESS >> PGDIR_SHIFT)
/*

6
drivers/media/pci/ivtv/ivtv-udma.c
View File

@ -124,10 +124,8 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
}
/* Get user pages for DMA Xfer */
down_read(&current->mm->mmap_sem);
err = get_user_pages(current, current->mm,
user_dma.uaddr, user_dma.page_count, 0, 1, dma->map, NULL);
up_read(&current->mm->mmap_sem);
err = get_user_pages_unlocked(current, current->mm,
user_dma.uaddr, user_dma.page_count, 0, 1, dma->map);
if (user_dma.page_count != err) {
IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",

7
drivers/scsi/st.c
View File

@ -4551,18 +4551,15 @@ static int sgl_map_user_pages(struct st_buffer *STbp,
return -ENOMEM;
/* Try to fault in all of the necessary pages */
down_read(&current->mm->mmap_sem);
/* rw==READ means read from drive, write into memory area */
res = get_user_pages(
res = get_user_pages_unlocked(
current,
current->mm,
uaddr,
nr_pages,
rw == READ,
0, /* don't force */
pages,
NULL);
up_read(&current->mm->mmap_sem);
pages);
/* Errors and no page mapped should return here */
if (res < nr_pages)

7
drivers/staging/android/lowmemorykiller.c
View File

@ -160,7 +160,12 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
selected->pid, selected->comm,
selected_oom_score_adj, selected_tasksize);
lowmem_deathpending_timeout = jiffies + HZ;
set_tsk_thread_flag(selected, TIF_MEMDIE);
/*
* FIXME: lowmemorykiller shouldn't abuse global OOM killer
* infrastructure. There is no real reason why the selected
* task should have access to the memory reserves.
*/
mark_tsk_oom_victim(selected);
send_sig(SIGKILL, selected, 0);
rem += selected_tasksize;
}

23
drivers/tty/sysrq.c
View File

@ -90,7 +90,7 @@ static void sysrq_handle_loglevel(int key)
i = key - '0';
console_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
printk("Loglevel set to %d\n", i);
pr_info("Loglevel set to %d\n", i);
console_loglevel = i;
}
static struct sysrq_key_op sysrq_loglevel_op = {
@ -220,7 +220,7 @@ static void showacpu(void *dummy)
return;
spin_lock_irqsave(&show_lock, flags);
printk(KERN_INFO "CPU%d:\n", smp_processor_id());
pr_info("CPU%d:\n", smp_processor_id());
show_stack(NULL, NULL);
spin_unlock_irqrestore(&show_lock, flags);
}
@ -243,7 +243,7 @@ static void sysrq_handle_showallcpus(int key)
struct pt_regs *regs = get_irq_regs();
if (regs) {
printk(KERN_INFO "CPU%d:\n", smp_processor_id());
pr_info("CPU%d:\n", smp_processor_id());
show_regs(regs);
}
schedule_work(&sysrq_showallcpus);
@ -355,8 +355,9 @@ static struct sysrq_key_op sysrq_term_op = {
static void moom_callback(struct work_struct *ignored)
{
out_of_memory(node_zonelist(first_memory_node, GFP_KERNEL), GFP_KERNEL,
0, NULL, true);
if (!out_of_memory(node_zonelist(first_memory_node, GFP_KERNEL),
GFP_KERNEL, 0, NULL, true))
pr_info("OOM request ignored because killer is disabled\n");
}
static DECLARE_WORK(moom_work, moom_callback);
@ -522,7 +523,7 @@ void __handle_sysrq(int key, bool check_mask)
*/
orig_log_level = console_loglevel;
console_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
printk(KERN_INFO "SysRq : ");
pr_info("SysRq : ");
op_p = __sysrq_get_key_op(key);
if (op_p) {
@ -531,14 +532,14 @@ void __handle_sysrq(int key, bool check_mask)
* should not) and is the invoked operation enabled?
*/
if (!check_mask || sysrq_on_mask(op_p->enable_mask)) {
printk("%s\n", op_p->action_msg);
pr_cont("%s\n", op_p->action_msg);
console_loglevel = orig_log_level;
op_p->handler(key);
} else {
printk("This sysrq operation is disabled.\n");
pr_cont("This sysrq operation is disabled.\n");
}
} else {
printk("HELP : ");
pr_cont("HELP : ");
/* Only print the help msg once per handler */
for (i = 0; i < ARRAY_SIZE(sysrq_key_table); i++) {
if (sysrq_key_table[i]) {
@ -549,10 +550,10 @@ void __handle_sysrq(int key, bool check_mask)
;
if (j != i)
continue;
printk("%s ", sysrq_key_table[i]->help_msg);
pr_cont("%s ", sysrq_key_table[i]->help_msg);
}
}
printk("\n");
pr_cont("\n");
console_loglevel = orig_log_level;
}
rcu_read_unlock();

6
drivers/video/fbdev/pvr2fb.c
View File

@ -686,10 +686,8 @@ static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
if (!pages)
return -ENOMEM;
down_read(&current->mm->mmap_sem);
ret = get_user_pages(current, current->mm, (unsigned long)buf,
nr_pages, WRITE, 0, pages, NULL);
up_read(&current->mm->mmap_sem);
ret = get_user_pages_unlocked(current, current->mm, (unsigned long)buf,
nr_pages, WRITE, 0, pages);
if (ret < nr_pages) {
nr_pages = ret;

2
fs/btrfs/extent_io.c
View File

@ -1407,8 +1407,8 @@ int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end)
while (index <= end_index) {
page = find_get_page(inode->i_mapping, index);
BUG_ON(!page); /* Pages should be in the extent_io_tree */
account_page_redirty(page);
__set_page_dirty_nobuffers(page);
account_page_redirty(page);
page_cache_release(page);
index++;
}

16
fs/proc/page.c
View File

@ -5,6 +5,7 @@
#include <linux/ksm.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/huge_mm.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/hugetlb.h>
@ -121,9 +122,18 @@ u64 stable_page_flags(struct page *page)
* just checks PG_head/PG_tail, so we need to check PageLRU/PageAnon
* to make sure a given page is a thp, not a non-huge compound page.
*/
else if (PageTransCompound(page) && (PageLRU(compound_head(page)) ||
PageAnon(compound_head(page))))
u |= 1 << KPF_THP;
else if (PageTransCompound(page)) {
struct page *head = compound_head(page);
if (PageLRU(head) || PageAnon(head))
u |= 1 << KPF_THP;
else if (is_huge_zero_page(head)) {
u |= 1 << KPF_ZERO_PAGE;
u |= 1 << KPF_THP;
}
} else if (is_zero_pfn(page_to_pfn(page)))
u |= 1 << KPF_ZERO_PAGE;
/*
* Caveats on high order pages: page->_count will only be set

218
fs/proc/task_mmu.c
View File

@ -21,7 +21,7 @@
void task_mem(struct seq_file *m, struct mm_struct *mm)
{
unsigned long data, text, lib, swap;
unsigned long data, text, lib, swap, ptes, pmds;
unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
/*
@ -42,6 +42,8 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
swap = get_mm_counter(mm, MM_SWAPENTS);
ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes);
pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm);
seq_printf(m,
"VmPeak:\t%8lu kB\n"
"VmSize:\t%8lu kB\n"
@ -54,6 +56,7 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
"VmExe:\t%8lu kB\n"
"VmLib:\t%8lu kB\n"
"VmPTE:\t%8lu kB\n"
"VmPMD:\t%8lu kB\n"
"VmSwap:\t%8lu kB\n",
hiwater_vm << (PAGE_SHIFT-10),
total_vm << (PAGE_SHIFT-10),
@ -63,8 +66,8 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
total_rss << (PAGE_SHIFT-10),
data << (PAGE_SHIFT-10),
mm->stack_vm << (PAGE_SHIFT-10), text, lib,
(PTRS_PER_PTE * sizeof(pte_t) *
atomic_long_read(&mm->nr_ptes)) >> 10,
ptes >> 10,
pmds >> 10,
swap << (PAGE_SHIFT-10));
}
@ -433,7 +436,6 @@ const struct file_operations proc_tid_maps_operations = {
#ifdef CONFIG_PROC_PAGE_MONITOR
struct mem_size_stats {
struct vm_area_struct *vma;
unsigned long resident;
unsigned long shared_clean;
unsigned long shared_dirty;
@ -482,7 +484,7 @@ static void smaps_pte_entry(pte_t *pte, unsigned long addr,
struct mm_walk *walk)
{
struct mem_size_stats *mss = walk->private;
struct vm_area_struct *vma = mss->vma;
struct vm_area_struct *vma = walk->vma;
struct page *page = NULL;
if (pte_present(*pte)) {
@ -506,7 +508,7 @@ static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
struct mm_walk *walk)
{
struct mem_size_stats *mss = walk->private;
struct vm_area_struct *vma = mss->vma;
struct vm_area_struct *vma = walk->vma;
struct page *page;
/* FOLL_DUMP will return -EFAULT on huge zero page */
@ -527,8 +529,7 @@ static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
struct mem_size_stats *mss = walk->private;
struct vm_area_struct *vma = mss->vma;
struct vm_area_struct *vma = walk->vma;
pte_t *pte;
spinlock_t *ptl;
@ -620,10 +621,8 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
};
memset(&mss, 0, sizeof mss);
mss.vma = vma;
/* mmap_sem is held in m_start */
if (vma->vm_mm && !is_vm_hugetlb_page(vma))
walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk);
walk_page_vma(vma, &smaps_walk);
show_map_vma(m, vma, is_pid);
@ -737,14 +736,13 @@ enum clear_refs_types {
};
struct clear_refs_private {
struct vm_area_struct *vma;
enum clear_refs_types type;
};
#ifdef CONFIG_MEM_SOFT_DIRTY
static inline void clear_soft_dirty(struct vm_area_struct *vma,
unsigned long addr, pte_t *pte)
{
#ifdef CONFIG_MEM_SOFT_DIRTY
/*
* The soft-dirty tracker uses #PF-s to catch writes
* to pages, so write-protect the pte as well. See the
@ -761,19 +759,60 @@ static inline void clear_soft_dirty(struct vm_area_struct *vma,
}
set_pte_at(vma->vm_mm, addr, pte, ptent);
#endif
}
static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmdp)
{
pmd_t pmd = *pmdp;
pmd = pmd_wrprotect(pmd);
pmd = pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
if (vma->vm_flags & VM_SOFTDIRTY)
vma->vm_flags &= ~VM_SOFTDIRTY;
set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
}
#else
static inline void clear_soft_dirty(struct vm_area_struct *vma,
unsigned long addr, pte_t *pte)
{
}
static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmdp)
{
}
#endif
static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
unsigned long end, struct mm_walk *walk)
{
struct clear_refs_private *cp = walk->private;
struct vm_area_struct *vma = cp->vma;
struct vm_area_struct *vma = walk->vma;
pte_t *pte, ptent;
spinlock_t *ptl;
struct page *page;
split_huge_page_pmd(vma, addr, pmd);
if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
clear_soft_dirty_pmd(vma, addr, pmd);
goto out;
}
page = pmd_page(*pmd);
/* Clear accessed and referenced bits. */
pmdp_test_and_clear_young(vma, addr, pmd);
ClearPageReferenced(page);
out:
spin_unlock(ptl);
return 0;
}
if (pmd_trans_unstable(pmd))
return 0;
@ -802,6 +841,28 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
return 0;
}
static int clear_refs_test_walk(unsigned long start, unsigned long end,
struct mm_walk *walk)
{
struct clear_refs_private *cp = walk->private;
struct vm_area_struct *vma = walk->vma;
if (vma->vm_flags & VM_PFNMAP)
return 1;
/*
* Writing 1 to /proc/pid/clear_refs affects all pages.
* Writing 2 to /proc/pid/clear_refs only affects anonymous pages.
* Writing 3 to /proc/pid/clear_refs only affects file mapped pages.
* Writing 4 to /proc/pid/clear_refs affects all pages.
*/
if (cp->type == CLEAR_REFS_ANON && vma->vm_file)
return 1;
if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file)
return 1;
return 0;
}
static ssize_t clear_refs_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
@ -842,6 +903,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
};
struct mm_walk clear_refs_walk = {
.pmd_entry = clear_refs_pte_range,
.test_walk = clear_refs_test_walk,
.mm = mm,
.private = &cp,
};
@ -861,28 +923,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
}
mmu_notifier_invalidate_range_start(mm, 0, -1);
}
for (vma = mm->mmap; vma; vma = vma->vm_next) {
cp.vma = vma;
if (is_vm_hugetlb_page(vma))
continue;
/*
* Writing 1 to /proc/pid/clear_refs affects all pages.
*
* Writing 2 to /proc/pid/clear_refs only affects
* Anonymous pages.
*
* Writing 3 to /proc/pid/clear_refs only affects file
* mapped pages.
*
* Writing 4 to /proc/pid/clear_refs affects all pages.
*/
if (type == CLEAR_REFS_ANON && vma->vm_file)
continue;
if (type == CLEAR_REFS_MAPPED && !vma->vm_file)
continue;
walk_page_range(vma->vm_start, vma->vm_end,
&clear_refs_walk);
}
walk_page_range(0, ~0UL, &clear_refs_walk);
if (type == CLEAR_REFS_SOFT_DIRTY)
mmu_notifier_invalidate_range_end(mm, 0, -1);
flush_tlb_mm(mm);
@ -1050,15 +1091,13 @@ static inline void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, struct pagemap
static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
struct vm_area_struct *vma;
struct vm_area_struct *vma = walk->vma;
struct pagemapread *pm = walk->private;
spinlock_t *ptl;
pte_t *pte;
pte_t *pte, *orig_pte;
int err = 0;
/* find the first VMA at or above 'addr' */
vma = find_vma(walk->mm, addr);
if (vma && pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
int pmd_flags2;
if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(*pmd))
@ -1084,51 +1123,20 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
if (pmd_trans_unstable(pmd))
return 0;
while (1) {
/* End of address space hole, which we mark as non-present. */
unsigned long hole_end;
/*
* We can assume that @vma always points to a valid one and @end never
* goes beyond vma->vm_end.
*/
orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
for (; addr < end; pte++, addr += PAGE_SIZE) {
pagemap_entry_t pme;
if (vma)
hole_end = min(end, vma->vm_start);
else
hole_end = end;
for (; addr < hole_end; addr += PAGE_SIZE) {
pagemap_entry_t pme = make_pme(PM_NOT_PRESENT(pm->v2));
err = add_to_pagemap(addr, &pme, pm);
if (err)
return err;
}
if (!vma || vma->vm_start >= end)
pte_to_pagemap_entry(&pme, pm, vma, addr, *pte);
err = add_to_pagemap(addr, &pme, pm);
if (err)
break;
/*
* We can't possibly be in a hugetlb VMA. In general,
* for a mm_walk with a pmd_entry and a hugetlb_entry,
* the pmd_entry can only be called on addresses in a
* hugetlb if the walk starts in a non-hugetlb VMA and
* spans a hugepage VMA. Since pagemap_read walks are
* PMD-sized and PMD-aligned, this will never be true.
*/
BUG_ON(is_vm_hugetlb_page(vma));
/* Addresses in the VMA. */
for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) {
pagemap_entry_t pme;
pte = pte_offset_map(pmd, addr);
pte_to_pagemap_entry(&pme, pm, vma, addr, *pte);
pte_unmap(pte);
err = add_to_pagemap(addr, &pme, pm);
if (err)
return err;
}
if (addr == end)
break;
vma = find_vma(walk->mm, addr);
}
pte_unmap_unlock(orig_pte, ptl);
cond_resched();
@ -1154,15 +1162,12 @@ static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
struct mm_walk *walk)
{
struct pagemapread *pm = walk->private;
struct vm_area_struct *vma;
struct vm_area_struct *vma = walk->vma;
int err = 0;
int flags2;
pagemap_entry_t pme;
vma = find_vma(walk->mm, addr);
WARN_ON_ONCE(!vma);
if (vma && (vma->vm_flags & VM_SOFTDIRTY))
if (vma->vm_flags & VM_SOFTDIRTY)
flags2 = __PM_SOFT_DIRTY;
else
flags2 = 0;
@ -1322,7 +1327,6 @@ const struct file_operations proc_pagemap_operations = {
#ifdef CONFIG_NUMA
struct numa_maps {
struct vm_area_struct *vma;
unsigned long pages;
unsigned long anon;
unsigned long active;
@ -1391,18 +1395,17 @@ static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
unsigned long end, struct mm_walk *walk)
{
struct numa_maps *md;
struct numa_maps *md = walk->private;
struct vm_area_struct *vma = walk->vma;
spinlock_t *ptl;
pte_t *orig_pte;
pte_t *pte;
md = walk->private;
if (pmd_trans_huge_lock(pmd, md->vma, &ptl) == 1) {
if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
pte_t huge_pte = *(pte_t *)pmd;
struct page *page;
page = can_gather_numa_stats(huge_pte, md->vma, addr);
page = can_gather_numa_stats(huge_pte, vma, addr);
if (page)
gather_stats(page, md, pte_dirty(huge_pte),
HPAGE_PMD_SIZE/PAGE_SIZE);
@ -1414,7 +1417,7 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
return 0;
orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
do {
struct page *page = can_gather_numa_stats(*pte, md->vma, addr);
struct page *page = can_gather_numa_stats(*pte, vma, addr);
if (!page)
continue;
gather_stats(page, md, pte_dirty(*pte), 1);
@ -1424,7 +1427,7 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
return 0;
}
#ifdef CONFIG_HUGETLB_PAGE
static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
unsigned long addr, unsigned long end, struct mm_walk *walk)
{
struct numa_maps *md;
@ -1443,7 +1446,7 @@ static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
}
#else
static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
unsigned long addr, unsigned long end, struct mm_walk *walk)
{
return 0;
@ -1461,7 +1464,12 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
struct numa_maps *md = &numa_priv->md;
struct file *file = vma->vm_file;
struct mm_struct *mm = vma->vm_mm;
struct mm_walk walk = {};
struct mm_walk walk = {
.hugetlb_entry = gather_hugetlb_stats,
.pmd_entry = gather_pte_stats,
.private = md,
.mm = mm,
};
struct mempolicy *pol;
char buffer[64];
int nid;
@ -1472,13 +1480,6 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
/* Ensure we start with an empty set of numa_maps statistics. */
memset(md, 0, sizeof(*md));
md->vma = vma;
walk.hugetlb_entry = gather_hugetbl_stats;
walk.pmd_entry = gather_pte_stats;
walk.private = md;
walk.mm = mm;
pol = __get_vma_policy(vma, vma->vm_start);
if (pol) {
mpol_to_str(buffer, sizeof(buffer), pol);
@ -1512,7 +1513,8 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
if (is_vm_hugetlb_page(vma))
seq_puts(m, " huge");
walk_page_range(vma->vm_start, vma->vm_end, &walk);
/* mmap_sem is held by m_start */
walk_page_vma(vma, &walk);
if (!md->pages)
goto out;

1
include/asm-generic/4level-fixup.h
View File

@ -4,6 +4,7 @@
#define __ARCH_HAS_4LEVEL_HACK
#define __PAGETABLE_PUD_FOLDED
#define PUD_SHIFT PGDIR_SHIFT
#define PUD_SIZE PGDIR_SIZE
#define PUD_MASK PGDIR_MASK
#define PTRS_PER_PUD 1

86
include/linux/compaction.h
View File

@ -12,6 +12,10 @@
#define COMPACT_PARTIAL 3
/* The full zone was compacted */
#define COMPACT_COMPLETE 4
/* For more detailed tracepoint output */
#define COMPACT_NO_SUITABLE_PAGE 5
#define COMPACT_NOT_SUITABLE_ZONE 6
/* When adding new state, please change compaction_status_string, too */
/* Used to signal whether compaction detected need_sched() or lock contention */
/* No contention detected */
@ -21,6 +25,8 @@
/* Zone lock or lru_lock was contended in async compaction */
#define COMPACT_CONTENDED_LOCK 2
struct alloc_context; /* in mm/internal.h */
#ifdef CONFIG_COMPACTION
extern int sysctl_compact_memory;
extern int sysctl_compaction_handler(struct ctl_table *table, int write,
@ -30,81 +36,25 @@ extern int sysctl_extfrag_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *length, loff_t *ppos);
extern int fragmentation_index(struct zone *zone, unsigned int order);
extern unsigned long try_to_compact_pages(struct zonelist *zonelist,
int order, gfp_t gfp_mask, nodemask_t *mask,
enum migrate_mode mode, int *contended,
int alloc_flags, int classzone_idx);
extern unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
int alloc_flags, const struct alloc_context *ac,
enum migrate_mode mode, int *contended);
extern void compact_pgdat(pg_data_t *pgdat, int order);
extern void reset_isolation_suitable(pg_data_t *pgdat);
extern unsigned long compaction_suitable(struct zone *zone, int order,
int alloc_flags, int classzone_idx);
/* Do not skip compaction more than 64 times */
#define COMPACT_MAX_DEFER_SHIFT 6
/*
* Compaction is deferred when compaction fails to result in a page
* allocation success. 1 << compact_defer_limit compactions are skipped up
* to a limit of 1 << COMPACT_MAX_DEFER_SHIFT
*/
static inline void defer_compaction(struct zone *zone, int order)
{
zone->compact_considered = 0;
zone->compact_defer_shift++;
if (order < zone->compact_order_failed)
zone->compact_order_failed = order;
if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT)
zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT;
}
/* Returns true if compaction should be skipped this time */
static inline bool compaction_deferred(struct zone *zone, int order)
{
unsigned long defer_limit = 1UL << zone->compact_defer_shift;
if (order < zone->compact_order_failed)
return false;
/* Avoid possible overflow */
if (++zone->compact_considered > defer_limit)
zone->compact_considered = defer_limit;
return zone->compact_considered < defer_limit;
}
/*
* Update defer tracking counters after successful compaction of given order,
* which means an allocation either succeeded (alloc_success == true) or is
* expected to succeed.
*/
static inline void compaction_defer_reset(struct zone *zone, int order,
bool alloc_success)
{
if (alloc_success) {
zone->compact_considered = 0;
zone->compact_defer_shift = 0;
}
if (order >= zone->compact_order_failed)
zone->compact_order_failed = order + 1;
}
/* Returns true if restarting compaction after many failures */
static inline bool compaction_restarting(struct zone *zone, int order)
{
if (order < zone->compact_order_failed)
return false;
return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT &&
zone->compact_considered >= 1UL << zone->compact_defer_shift;
}
extern void defer_compaction(struct zone *zone, int order);
extern bool compaction_deferred(struct zone *zone, int order);
extern void compaction_defer_reset(struct zone *zone, int order,
bool alloc_success);
extern bool compaction_restarting(struct zone *zone, int order);
#else
static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
int order, gfp_t gfp_mask, nodemask_t *nodemask,
enum migrate_mode mode, int *contended,
int alloc_flags, int classzone_idx)
static inline unsigned long try_to_compact_pages(gfp_t gfp_mask,
unsigned int order, int alloc_flags,
const struct alloc_context *ac,
enum migrate_mode mode, int *contended)
{
return COMPACT_CONTINUE;
}

12
include/linux/gfp.h
View File

@ -334,18 +334,22 @@ alloc_pages(gfp_t gfp_mask, unsigned int order)
}
extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
struct vm_area_struct *vma, unsigned long addr,
int node);
int node, bool hugepage);
#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true)
#else
#define alloc_pages(gfp_mask, order) \
alloc_pages_node(numa_node_id(), gfp_mask, order)
#define alloc_pages_vma(gfp_mask, order, vma, addr, node) \
#define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\
alloc_pages(gfp_mask, order)
#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
alloc_pages(gfp_mask, order)
#endif
#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
#define alloc_page_vma(gfp_mask, vma, addr) \
alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id())
alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false)
#define alloc_page_vma_node(gfp_mask, vma, addr, node) \
alloc_pages_vma(gfp_mask, 0, vma, addr, node)
alloc_pages_vma(gfp_mask, 0, vma, addr, node, false)
extern struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order);
extern struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask,

12
include/linux/huge_mm.h
View File

@ -157,6 +157,13 @@ static inline int hpage_nr_pages(struct page *page)
extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, pmd_t pmd, pmd_t *pmdp);
extern struct page *huge_zero_page;
static inline bool is_huge_zero_page(struct page *page)
{
return ACCESS_ONCE(huge_zero_page) == page;
}
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
@ -206,6 +213,11 @@ static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_str
return 0;
}
static inline bool is_huge_zero_page(struct page *page)
{
return false;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif /* _LINUX_HUGE_MM_H */

8
include/linux/hugetlb.h
View File

@ -99,9 +99,9 @@ int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
int write);
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write);
pmd_t *pmd, int flags);
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
pud_t *pud, int write);
pud_t *pud, int flags);
int pmd_huge(pmd_t pmd);
int pud_huge(pud_t pmd);
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
@ -133,8 +133,8 @@ static inline void hugetlb_report_meminfo(struct seq_file *m)
static inline void hugetlb_show_meminfo(void)
{
}
#define follow_huge_pmd(mm, addr, pmd, write) NULL
#define follow_huge_pud(mm, addr, pud, write) NULL
#define follow_huge_pmd(mm, addr, pmd, flags) NULL
#define follow_huge_pud(mm, addr, pud, flags) NULL
#define prepare_hugepage_range(file, addr, len) (-EINVAL)
#define pmd_huge(x) 0
#define pud_huge(x) 0

11
include/linux/kvm_host.h
View File

@ -200,17 +200,6 @@ int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, unsigned long hva,
int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
#endif
/*
* Carry out a gup that requires IO. Allow the mm to relinquish the mmap
* semaphore if the filemap/swap has to wait on a page lock. pagep == NULL
* controls whether we retry the gup one more time to completion in that case.
* Typically this is called after a FAULT_FLAG_RETRY_NOWAIT in the main tdp
* handler.
*/
int kvm_get_user_page_io(struct task_struct *tsk, struct mm_struct *mm,
unsigned long addr, bool write_fault,
struct page **pagep);
enum {
OUTSIDE_GUEST_MODE,
IN_GUEST_MODE,

50
include/linux/memcontrol.h
View File

@ -52,7 +52,27 @@ struct mem_cgroup_reclaim_cookie {
unsigned int generation;
};
enum mem_cgroup_events_index {
MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */
MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */
MEM_CGROUP_EVENTS_PGFAULT, /* # of page-faults */
MEM_CGROUP_EVENTS_PGMAJFAULT, /* # of major page-faults */
MEM_CGROUP_EVENTS_NSTATS,
/* default hierarchy events */
MEMCG_LOW = MEM_CGROUP_EVENTS_NSTATS,
MEMCG_HIGH,
MEMCG_MAX,
MEMCG_OOM,
MEMCG_NR_EVENTS,
};
#ifdef CONFIG_MEMCG
void mem_cgroup_events(struct mem_cgroup *memcg,
enum mem_cgroup_events_index idx,
unsigned int nr);
bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg);
int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask, struct mem_cgroup **memcgp);
void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
@ -102,6 +122,7 @@ void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
* For memory reclaim.
*/
int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec);
bool mem_cgroup_lruvec_online(struct lruvec *lruvec);
int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
@ -138,12 +159,10 @@ static inline bool mem_cgroup_disabled(void)
return false;
}
struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page, bool *locked,
unsigned long *flags);
void mem_cgroup_end_page_stat(struct mem_cgroup *memcg, bool *locked,
unsigned long *flags);
struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page);
void mem_cgroup_update_page_stat(struct mem_cgroup *memcg,
enum mem_cgroup_stat_index idx, int val);
void mem_cgroup_end_page_stat(struct mem_cgroup *memcg);
static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg,
enum mem_cgroup_stat_index idx)
@ -176,6 +195,18 @@ void mem_cgroup_split_huge_fixup(struct page *head);
#else /* CONFIG_MEMCG */
struct mem_cgroup;
static inline void mem_cgroup_events(struct mem_cgroup *memcg,
enum mem_cgroup_events_index idx,
unsigned int nr)
{
}
static inline bool mem_cgroup_low(struct mem_cgroup *root,
struct mem_cgroup *memcg)
{
return false;
}
static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask,
struct mem_cgroup **memcgp)
@ -268,6 +299,11 @@ mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
return 1;
}
static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec)
{
return true;
}
static inline unsigned long
mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
{
@ -285,14 +321,12 @@ mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
{
}
static inline struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page,
bool *locked, unsigned long *flags)
static inline struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page)
{
return NULL;
}
static inline void mem_cgroup_end_page_stat(struct mem_cgroup *memcg,
bool *locked, unsigned long *flags)
static inline void mem_cgroup_end_page_stat(struct mem_cgroup *memcg)
{
}

69
include/linux/mm.h
View File

@ -484,7 +484,8 @@ static inline void page_mapcount_reset(struct page *page)
static inline int page_mapcount(struct page *page)
{
return atomic_read(&(page)->_mapcount) + 1;
VM_BUG_ON_PAGE(PageSlab(page), page);
return atomic_read(&page->_mapcount) + 1;
}
static inline int page_count(struct page *page)
@ -627,29 +628,28 @@ int split_free_page(struct page *page);
* prototype for that function and accessor functions.
* These are _only_ valid on the head of a PG_compound page.
*/
typedef void compound_page_dtor(struct page *);
static inline void set_compound_page_dtor(struct page *page,
compound_page_dtor *dtor)
{
page[1].lru.next = (void *)dtor;
page[1].compound_dtor = dtor;
}
static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
{
return (compound_page_dtor *)page[1].lru.next;
return page[1].compound_dtor;
}
static inline int compound_order(struct page *page)
{
if (!PageHead(page))
return 0;
return (unsigned long)page[1].lru.prev;
return page[1].compound_order;
}
static inline void set_compound_order(struct page *page, unsigned long order)
{
page[1].lru.prev = (void *)order;
page[1].compound_order = order;
}
#ifdef CONFIG_MMU
@ -1164,8 +1164,6 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
/**
* mm_walk - callbacks for walk_page_range
* @pgd_entry: if set, called for each non-empty PGD (top-level) entry
* @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
* @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
* this handler is required to be able to handle
* pmd_trans_huge() pmds. They may simply choose to
@ -1173,16 +1171,18 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
* @pte_entry: if set, called for each non-empty PTE (4th-level) entry
* @pte_hole: if set, called for each hole at all levels
* @hugetlb_entry: if set, called for each hugetlb entry
* *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
* is used.
* @test_walk: caller specific callback function to determine whether
* we walk over the current vma or not. A positive returned
* value means "do page table walk over the current vma,"
* and a negative one means "abort current page table walk
* right now." 0 means "skip the current vma."
* @mm: mm_struct representing the target process of page table walk
* @vma: vma currently walked (NULL if walking outside vmas)
* @private: private data for callbacks' usage
*
* (see walk_page_range for more details)
* (see the comment on walk_page_range() for more details)
*/
struct mm_walk {
int (*pgd_entry)(pgd_t *pgd, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pud_entry)(pud_t *pud, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
unsigned long next, struct mm_walk *walk);
int (*pte_entry)(pte_t *pte, unsigned long addr,
@ -1192,12 +1192,16 @@ struct mm_walk {
int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
unsigned long addr, unsigned long next,
struct mm_walk *walk);
int (*test_walk)(unsigned long addr, unsigned long next,
struct mm_walk *walk);
struct mm_struct *mm;
struct vm_area_struct *vma;
void *private;
};
int walk_page_range(unsigned long addr, unsigned long end,
struct mm_walk *walk);
int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
unsigned long end, unsigned long floor, unsigned long ceiling);
int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
@ -1261,6 +1265,17 @@ long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
struct vm_area_struct **vmas);
long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
int *locked);
long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
unsigned int gup_flags);
long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages);
int get_user_pages_fast(unsigned long start, int nr_pages, int write,
struct page **pages);
struct kvec;
@ -1438,8 +1453,32 @@ static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
{
return 0;
}
static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
{
return 0;
}
static inline void mm_inc_nr_pmds(struct mm_struct *mm) {}
static inline void mm_dec_nr_pmds(struct mm_struct *mm) {}
#else
int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
static inline unsigned long mm_nr_pmds(struct mm_struct *mm)
{
return atomic_long_read(&mm->nr_pmds);
}
static inline void mm_inc_nr_pmds(struct mm_struct *mm)
{
atomic_long_inc(&mm->nr_pmds);
}
static inline void mm_dec_nr_pmds(struct mm_struct *mm)
{
atomic_long_dec(&mm->nr_pmds);
}
#endif
int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,

11
include/linux/mm_types.h
View File

@ -28,6 +28,8 @@ struct mem_cgroup;
IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK))
#define ALLOC_SPLIT_PTLOCKS (SPINLOCK_SIZE > BITS_PER_LONG/8)
typedef void compound_page_dtor(struct page *);
/*
* Each physical page in the system has a struct page associated with
* it to keep track of whatever it is we are using the page for at the
@ -142,6 +144,12 @@ struct page {
struct rcu_head rcu_head; /* Used by SLAB
* when destroying via RCU
*/
/* First tail page of compound page */
struct {
compound_page_dtor *compound_dtor;
unsigned long compound_order;
};
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && USE_SPLIT_PMD_PTLOCKS
pgtable_t pmd_huge_pte; /* protected by page->ptl */
#endif
@ -355,7 +363,8 @@ struct mm_struct {
pgd_t * pgd;
atomic_t mm_users; /* How many users with user space? */
atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
atomic_long_t nr_ptes; /* Page table pages */
atomic_long_t nr_ptes; /* PTE page table pages */
atomic_long_t nr_pmds; /* PMD page table pages */
int map_count; /* number of VMAs */
spinlock_t page_table_lock; /* Protects page tables and some counters */

15
include/linux/mmzone.h
View File

@ -426,7 +426,7 @@ struct zone {
const char *name;
/*
* Number of MIGRATE_RESEVE page block. To maintain for just
* Number of MIGRATE_RESERVE page block. To maintain for just
* optimization. Protected by zone->lock.
*/
int nr_migrate_reserve_block;
@ -970,7 +970,6 @@ static inline int zonelist_node_idx(struct zoneref *zoneref)
* @z - The cursor used as a starting point for the search
* @highest_zoneidx - The zone index of the highest zone to return
* @nodes - An optional nodemask to filter the zonelist with
* @zone - The first suitable zone found is returned via this parameter
*
* This function returns the next zone at or below a given zone index that is
* within the allowed nodemask using a cursor as the starting point for the
@ -980,8 +979,7 @@ static inline int zonelist_node_idx(struct zoneref *zoneref)
*/
struct zoneref *next_zones_zonelist(struct zoneref *z,
enum zone_type highest_zoneidx,
nodemask_t *nodes,
struct zone **zone);
nodemask_t *nodes);
/**
* first_zones_zonelist - Returns the first zone at or below highest_zoneidx within the allowed nodemask in a zonelist
@ -1000,8 +998,10 @@ static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist,
nodemask_t *nodes,
struct zone **zone)
{
return next_zones_zonelist(zonelist->_zonerefs, highest_zoneidx, nodes,
zone);
struct zoneref *z = next_zones_zonelist(zonelist->_zonerefs,
highest_zoneidx, nodes);
*zone = zonelist_zone(z);
return z;
}
/**
@ -1018,7 +1018,8 @@ static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist,
#define for_each_zone_zonelist_nodemask(zone, z, zlist, highidx, nodemask) \
for (z = first_zones_zonelist(zlist, highidx, nodemask, &zone); \
zone; \
z = next_zones_zonelist(++z, highidx, nodemask, &zone)) \
z = next_zones_zonelist(++z, highidx, nodemask), \
zone = zonelist_zone(z)) \
/**
* for_each_zone_zonelist - helper macro to iterate over valid zones in a zonelist at or below a given zone index

18
include/linux/oom.h
View File

@ -47,6 +47,10 @@ static inline bool oom_task_origin(const struct task_struct *p)
return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN);
}
extern void mark_tsk_oom_victim(struct task_struct *tsk);
extern void unmark_oom_victim(void);
extern unsigned long oom_badness(struct task_struct *p,
struct mem_cgroup *memcg, const nodemask_t *nodemask,
unsigned long totalpages);
@ -68,22 +72,14 @@ extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
unsigned long totalpages, const nodemask_t *nodemask,
bool force_kill);
extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
extern bool out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
int order, nodemask_t *mask, bool force_kill);
extern int register_oom_notifier(struct notifier_block *nb);
extern int unregister_oom_notifier(struct notifier_block *nb);
extern bool oom_killer_disabled;
static inline void oom_killer_disable(void)
{
oom_killer_disabled = true;
}
static inline void oom_killer_enable(void)
{
oom_killer_disabled = false;
}
extern bool oom_killer_disable(void);
extern void oom_killer_enable(void);
extern struct task_struct *find_lock_task_mm(struct task_struct *p);

3
include/linux/page_counter.h
View File

@ -41,7 +41,8 @@ int page_counter_try_charge(struct page_counter *counter,
struct page_counter **fail);
void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages);
int page_counter_limit(struct page_counter *counter, unsigned long limit);
int page_counter_memparse(const char *buf, unsigned long *nr_pages);
int page_counter_memparse(const char *buf, const char *max,
unsigned long *nr_pages);
static inline void page_counter_reset_watermark(struct page_counter *counter)
{

2
include/linux/page_ext.h
View File

@ -40,7 +40,7 @@ struct page_ext {
#ifdef CONFIG_PAGE_OWNER
unsigned int order;
gfp_t gfp_mask;
struct stack_trace trace;
unsigned int nr_entries;
unsigned long trace_entries[8];
#endif
};

15
include/linux/swap.h
View File

@ -437,16 +437,6 @@ extern int reuse_swap_page(struct page *);
extern int try_to_free_swap(struct page *);
struct backing_dev_info;
#ifdef CONFIG_MEMCG
extern void
mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout);
#else
static inline void
mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout)
{
}
#endif
#else /* CONFIG_SWAP */
#define swap_address_space(entry) (NULL)
@ -547,11 +537,6 @@ static inline swp_entry_t get_swap_page(void)
return entry;
}
static inline void
mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent)
{
}
#endif /* CONFIG_SWAP */
#endif /* __KERNEL__*/
#endif /* _LINUX_SWAP_H */

4
include/linux/swapops.h
View File

@ -135,6 +135,8 @@ static inline void make_migration_entry_read(swp_entry_t *entry)
*entry = swp_entry(SWP_MIGRATION_READ, swp_offset(*entry));
}
extern void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
spinlock_t *ptl);
extern void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
unsigned long address);
extern void migration_entry_wait_huge(struct vm_area_struct *vma,
@ -148,6 +150,8 @@ static inline int is_migration_entry(swp_entry_t swp)
}
#define migration_entry_to_page(swp) NULL
static inline void make_migration_entry_read(swp_entry_t *entryp) { }
static inline void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
spinlock_t *ptl) { }
static inline void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
unsigned long address) { }
static inline void migration_entry_wait_huge(struct vm_area_struct *vma,

209
include/trace/events/compaction.h
View File

@ -11,39 +11,55 @@
DECLARE_EVENT_CLASS(mm_compaction_isolate_template,
TP_PROTO(unsigned long nr_scanned,
TP_PROTO(
unsigned long start_pfn,
unsigned long end_pfn,
unsigned long nr_scanned,
unsigned long nr_taken),
TP_ARGS(nr_scanned, nr_taken),
TP_ARGS(start_pfn, end_pfn, nr_scanned, nr_taken),
TP_STRUCT__entry(
__field(unsigned long, start_pfn)
__field(unsigned long, end_pfn)
__field(unsigned long, nr_scanned)
__field(unsigned long, nr_taken)
),
TP_fast_assign(
__entry->start_pfn = start_pfn;
__entry->end_pfn = end_pfn;
__entry->nr_scanned = nr_scanned;
__entry->nr_taken = nr_taken;
),
TP_printk("nr_scanned=%lu nr_taken=%lu",
TP_printk("range=(0x%lx ~ 0x%lx) nr_scanned=%lu nr_taken=%lu",
__entry->start_pfn,
__entry->end_pfn,
__entry->nr_scanned,
__entry->nr_taken)
);
DEFINE_EVENT(mm_compaction_isolate_template, mm_compaction_isolate_migratepages,
TP_PROTO(unsigned long nr_scanned,
TP_PROTO(
unsigned long start_pfn,
unsigned long end_pfn,
unsigned long nr_scanned,
unsigned long nr_taken),
TP_ARGS(nr_scanned, nr_taken)
TP_ARGS(start_pfn, end_pfn, nr_scanned, nr_taken)
);
DEFINE_EVENT(mm_compaction_isolate_template, mm_compaction_isolate_freepages,
TP_PROTO(unsigned long nr_scanned,
TP_PROTO(
unsigned long start_pfn,
unsigned long end_pfn,
unsigned long nr_scanned,
unsigned long nr_taken),
TP_ARGS(nr_scanned, nr_taken)
TP_ARGS(start_pfn, end_pfn, nr_scanned, nr_taken)
);
TRACE_EVENT(mm_compaction_migratepages,
@ -85,48 +101,199 @@ TRACE_EVENT(mm_compaction_migratepages,
);
TRACE_EVENT(mm_compaction_begin,
TP_PROTO(unsigned long zone_start, unsigned long migrate_start,
unsigned long free_start, unsigned long zone_end),
TP_PROTO(unsigned long zone_start, unsigned long migrate_pfn,
unsigned long free_pfn, unsigned long zone_end, bool sync),
TP_ARGS(zone_start, migrate_start, free_start, zone_end),
TP_ARGS(zone_start, migrate_pfn, free_pfn, zone_end, sync),
TP_STRUCT__entry(
__field(unsigned long, zone_start)
__field(unsigned long, migrate_start)
__field(unsigned long, free_start)
__field(unsigned long, migrate_pfn)
__field(unsigned long, free_pfn)
__field(unsigned long, zone_end)
__field(bool, sync)
),
TP_fast_assign(
__entry->zone_start = zone_start;
__entry->migrate_start = migrate_start;
__entry->free_start = free_start;
__entry->migrate_pfn = migrate_pfn;
__entry->free_pfn = free_pfn;
__entry->zone_end = zone_end;
__entry->sync = sync;
),
TP_printk("zone_start=%lu migrate_start=%lu free_start=%lu zone_end=%lu",
TP_printk("zone_start=0x%lx migrate_pfn=0x%lx free_pfn=0x%lx zone_end=0x%lx, mode=%s",
__entry->zone_start,
__entry->migrate_start,
__entry->free_start,
__entry->zone_end)
__entry->migrate_pfn,
__entry->free_pfn,
__entry->zone_end,
__entry->sync ? "sync" : "async")
);
TRACE_EVENT(mm_compaction_end,
TP_PROTO(int status),
TP_PROTO(unsigned long zone_start, unsigned long migrate_pfn,
unsigned long free_pfn, unsigned long zone_end, bool sync,
int status),
TP_ARGS(status),
TP_ARGS(zone_start, migrate_pfn, free_pfn, zone_end, sync, status),
TP_STRUCT__entry(
__field(unsigned long, zone_start)
__field(unsigned long, migrate_pfn)
__field(unsigned long, free_pfn)
__field(unsigned long, zone_end)
__field(bool, sync)
__field(int, status)
),
TP_fast_assign(
__entry->zone_start = zone_start;
__entry->migrate_pfn = migrate_pfn;
__entry->free_pfn = free_pfn;
__entry->zone_end = zone_end;
__entry->sync = sync;
__entry->status = status;
),
TP_printk("status=%d", __entry->status)
TP_printk("zone_start=0x%lx migrate_pfn=0x%lx free_pfn=0x%lx zone_end=0x%lx, mode=%s status=%s",
__entry->zone_start,
__entry->migrate_pfn,
__entry->free_pfn,
__entry->zone_end,
__entry->sync ? "sync" : "async",
compaction_status_string[__entry->status])
);
TRACE_EVENT(mm_compaction_try_to_compact_pages,
TP_PROTO(
int order,
gfp_t gfp_mask,
enum migrate_mode mode),
TP_ARGS(order, gfp_mask, mode),
TP_STRUCT__entry(
__field(int, order)
__field(gfp_t, gfp_mask)
__field(enum migrate_mode, mode)
),
TP_fast_assign(
__entry->order = order;
__entry->gfp_mask = gfp_mask;
__entry->mode = mode;
),
TP_printk("order=%d gfp_mask=0x%x mode=%d",
__entry->order,
__entry->gfp_mask,
(int)__entry->mode)
);
DECLARE_EVENT_CLASS(mm_compaction_suitable_template,
TP_PROTO(struct zone *zone,
int order,
int ret),
TP_ARGS(zone, order, ret),
TP_STRUCT__entry(
__field(int, nid)
__field(char *, name)
__field(int, order)
__field(int, ret)
),
TP_fast_assign(
__entry->nid = zone_to_nid(zone);
__entry->name = (char *)zone->name;
__entry->order = order;
__entry->ret = ret;
),
TP_printk("node=%d zone=%-8s order=%d ret=%s",
__entry->nid,
__entry->name,
__entry->order,
compaction_status_string[__entry->ret])
);
DEFINE_EVENT(mm_compaction_suitable_template, mm_compaction_finished,
TP_PROTO(struct zone *zone,
int order,
int ret),
TP_ARGS(zone, order, ret)
);
DEFINE_EVENT(mm_compaction_suitable_template, mm_compaction_suitable,
TP_PROTO(struct zone *zone,
int order,
int ret),
TP_ARGS(zone, order, ret)
);
#ifdef CONFIG_COMPACTION
DECLARE_EVENT_CLASS(mm_compaction_defer_template,
TP_PROTO(struct zone *zone, int order),
TP_ARGS(zone, order),
TP_STRUCT__entry(
__field(int, nid)
__field(char *, name)
__field(int, order)
__field(unsigned int, considered)
__field(unsigned int, defer_shift)
__field(int, order_failed)
),
TP_fast_assign(
__entry->nid = zone_to_nid(zone);
__entry->name = (char *)zone->name;
__entry->order = order;
__entry->considered = zone->compact_considered;
__entry->defer_shift = zone->compact_defer_shift;
__entry->order_failed = zone->compact_order_failed;
),
TP_printk("node=%d zone=%-8s order=%d order_failed=%d consider=%u limit=%lu",
__entry->nid,
__entry->name,
__entry->order,
__entry->order_failed,
__entry->considered,
1UL << __entry->defer_shift)
);
DEFINE_EVENT(mm_compaction_defer_template, mm_compaction_deferred,
TP_PROTO(struct zone *zone, int order),
TP_ARGS(zone, order)
);
DEFINE_EVENT(mm_compaction_defer_template, mm_compaction_defer_compaction,
TP_PROTO(struct zone *zone, int order),
TP_ARGS(zone, order)
);
DEFINE_EVENT(mm_compaction_defer_template, mm_compaction_defer_reset,
TP_PROTO(struct zone *zone, int order),
TP_ARGS(zone, order)
);
#endif
#endif /* _TRACE_COMPACTION_H */
/* This part must be outside protection */

7
include/trace/events/kmem.h
View File

@ -268,11 +268,11 @@ TRACE_EVENT(mm_page_alloc_extfrag,
TP_PROTO(struct page *page,
int alloc_order, int fallback_order,
int alloc_migratetype, int fallback_migratetype, int new_migratetype),
int alloc_migratetype, int fallback_migratetype),
TP_ARGS(page,
alloc_order, fallback_order,
alloc_migratetype, fallback_migratetype, new_migratetype),
alloc_migratetype, fallback_migratetype),
TP_STRUCT__entry(
__field( struct page *, page )
@ -289,7 +289,8 @@ TRACE_EVENT(mm_page_alloc_extfrag,
__entry->fallback_order = fallback_order;
__entry->alloc_migratetype = alloc_migratetype;
__entry->fallback_migratetype = fallback_migratetype;
__entry->change_ownership = (new_migratetype == alloc_migratetype);
__entry->change_ownership = (alloc_migratetype ==
get_pageblock_migratetype(page));
),
TP_printk("page=%p pfn=%lu alloc_order=%d fallback_order=%d pageblock_order=%d alloc_migratetype=%d fallback_migratetype=%d fragmenting=%d change_ownership=%d",

1
include/uapi/linux/kernel-page-flags.h
View File

@ -32,6 +32,7 @@
#define KPF_KSM 21
#define KPF_THP 22
#define KPF_BALLOON 23
#define KPF_ZERO_PAGE 24
#endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */

3
kernel/exit.c
View File

@ -435,7 +435,8 @@ static void exit_mm(struct task_struct *tsk)
task_unlock(tsk);
mm_update_next_owner(mm);
mmput(mm);
clear_thread_flag(TIF_MEMDIE);
if (test_thread_flag(TIF_MEMDIE))
unmark_oom_victim();
}
static struct task_struct *find_alive_thread(struct task_struct *p)

11
kernel/fork.c
View File

@ -555,6 +555,9 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p)
INIT_LIST_HEAD(&mm->mmlist);
mm->core_state = NULL;
atomic_long_set(&mm->nr_ptes, 0);
#ifndef __PAGETABLE_PMD_FOLDED
atomic_long_set(&mm->nr_pmds, 0);
#endif
mm->map_count = 0;
mm->locked_vm = 0;
mm->pinned_vm = 0;
@ -603,6 +606,14 @@ static void check_mm(struct mm_struct *mm)
printk(KERN_ALERT "BUG: Bad rss-counter state "
"mm:%p idx:%d val:%ld\n", mm, i, x);
}
if (atomic_long_read(&mm->nr_ptes))
pr_alert("BUG: non-zero nr_ptes on freeing mm: %ld\n",
atomic_long_read(&mm->nr_ptes));
if (mm_nr_pmds(mm))
pr_alert("BUG: non-zero nr_pmds on freeing mm: %ld\n",
mm_nr_pmds(mm));
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
VM_BUG_ON_MM(mm->pmd_huge_pte, mm);
#endif

75
kernel/power/process.c
View File

@ -84,8 +84,8 @@ static int try_to_freeze_tasks(bool user_only)
elapsed_msecs = elapsed_msecs64;
if (todo) {
printk("\n");
printk(KERN_ERR "Freezing of tasks %s after %d.%03d seconds "
pr_cont("\n");
pr_err("Freezing of tasks %s after %d.%03d seconds "
"(%d tasks refusing to freeze, wq_busy=%d):\n",
wakeup ? "aborted" : "failed",
elapsed_msecs / 1000, elapsed_msecs % 1000,
@ -101,37 +101,13 @@ static int try_to_freeze_tasks(bool user_only)
read_unlock(&tasklist_lock);
}
} else {
printk("(elapsed %d.%03d seconds) ", elapsed_msecs / 1000,
pr_cont("(elapsed %d.%03d seconds) ", elapsed_msecs / 1000,
elapsed_msecs % 1000);
}
return todo ? -EBUSY : 0;
}
static bool __check_frozen_processes(void)
{
struct task_struct *g, *p;
for_each_process_thread(g, p)
if (p != current && !freezer_should_skip(p) && !frozen(p))
return false;
return true;
}
/*
* Returns true if all freezable tasks (except for current) are frozen already
*/
static bool check_frozen_processes(void)
{
bool ret;
read_lock(&tasklist_lock);
ret = __check_frozen_processes();
read_unlock(&tasklist_lock);
return ret;
}
/**
* freeze_processes - Signal user space processes to enter the refrigerator.
* The current thread will not be frozen. The same process that calls
@ -142,7 +118,6 @@ static bool check_frozen_processes(void)
int freeze_processes(void)
{
int error;
int oom_kills_saved;
error = __usermodehelper_disable(UMH_FREEZING);
if (error)
@ -155,31 +130,24 @@ int freeze_processes(void)
atomic_inc(&system_freezing_cnt);
pm_wakeup_clear();
printk("Freezing user space processes ... ");
pr_info("Freezing user space processes ... ");
pm_freezing = true;
oom_kills_saved = oom_kills_count();
error = try_to_freeze_tasks(true);
if (!error) {
__usermodehelper_set_disable_depth(UMH_DISABLED);
oom_killer_disable();
/*
* There might have been an OOM kill while we were
* freezing tasks and the killed task might be still
* on the way out so we have to double check for race.
*/
if (oom_kills_count() != oom_kills_saved &&
!check_frozen_processes()) {
__usermodehelper_set_disable_depth(UMH_ENABLED);
printk("OOM in progress.");
error = -EBUSY;
} else {
printk("done.");
}
pr_cont("done.");
}
printk("\n");
pr_cont("\n");
BUG_ON(in_atomic());
/*
* Now that the whole userspace is frozen we need to disbale
* the OOM killer to disallow any further interference with
* killable tasks.
*/
if (!error && !oom_killer_disable())
error = -EBUSY;
if (error)
thaw_processes();
return error;
@ -197,13 +165,14 @@ int freeze_kernel_threads(void)
{
int error;
printk("Freezing remaining freezable tasks ... ");
pr_info("Freezing remaining freezable tasks ... ");
pm_nosig_freezing = true;
error = try_to_freeze_tasks(false);
if (!error)
printk("done.");
pr_cont("done.");
printk("\n");
pr_cont("\n");
BUG_ON(in_atomic());
if (error)
@ -224,7 +193,7 @@ void thaw_processes(void)
oom_killer_enable();
printk("Restarting tasks ... ");
pr_info("Restarting tasks ... ");
__usermodehelper_set_disable_depth(UMH_FREEZING);
thaw_workqueues();
@ -243,7 +212,7 @@ void thaw_processes(void)
usermodehelper_enable();
schedule();
printk("done.\n");
pr_cont("done.\n");
trace_suspend_resume(TPS("thaw_processes"), 0, false);
}
@ -252,7 +221,7 @@ void thaw_kernel_threads(void)
struct task_struct *g, *p;
pm_nosig_freezing = false;
printk("Restarting kernel threads ... ");
pr_info("Restarting kernel threads ... ");
thaw_workqueues();
@ -264,5 +233,5 @@ void thaw_kernel_threads(void)
read_unlock(&tasklist_lock);
schedule();
printk("done.\n");
pr_cont("done.\n");
}

2
mm/cma.c
View File

@ -199,6 +199,7 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
cma->order_per_bit = order_per_bit;
*res_cma = cma;
cma_area_count++;
totalcma_pages += (size / PAGE_SIZE);
return 0;
}
@ -337,7 +338,6 @@ int __init cma_declare_contiguous(phys_addr_t base,
if (ret)
goto err;
totalcma_pages += (size / PAGE_SIZE);
pr_info("Reserved %ld MiB at %pa\n", (unsigned long)size / SZ_1M,
&base);
return 0;

156
mm/compaction.c
View File

@ -34,6 +34,17 @@ static inline void count_compact_events(enum vm_event_item item, long delta)
#endif
#if defined CONFIG_COMPACTION || defined CONFIG_CMA
#ifdef CONFIG_TRACEPOINTS
static const char *const compaction_status_string[] = {
"deferred",
"skipped",
"continue",
"partial",
"complete",
"no_suitable_page",
"not_suitable_zone",
};
#endif
#define CREATE_TRACE_POINTS
#include <trace/events/compaction.h>
@ -113,6 +124,77 @@ static struct page *pageblock_pfn_to_page(unsigned long start_pfn,
}
#ifdef CONFIG_COMPACTION
/* Do not skip compaction more than 64 times */
#define COMPACT_MAX_DEFER_SHIFT 6
/*
* Compaction is deferred when compaction fails to result in a page
* allocation success. 1 << compact_defer_limit compactions are skipped up
* to a limit of 1 << COMPACT_MAX_DEFER_SHIFT
*/
void defer_compaction(struct zone *zone, int order)
{
zone->compact_considered = 0;
zone->compact_defer_shift++;
if (order < zone->compact_order_failed)
zone->compact_order_failed = order;
if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT)
zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT;
trace_mm_compaction_defer_compaction(zone, order);
}
/* Returns true if compaction should be skipped this time */
bool compaction_deferred(struct zone *zone, int order)
{
unsigned long defer_limit = 1UL << zone->compact_defer_shift;
if (order < zone->compact_order_failed)
return false;
/* Avoid possible overflow */
if (++zone->compact_considered > defer_limit)
zone->compact_considered = defer_limit;
if (zone->compact_considered >= defer_limit)
return false;
trace_mm_compaction_deferred(zone, order);
return true;
}
/*
* Update defer tracking counters after successful compaction of given order,
* which means an allocation either succeeded (alloc_success == true) or is
* expected to succeed.
*/
void compaction_defer_reset(struct zone *zone, int order,
bool alloc_success)
{
if (alloc_success) {
zone->compact_considered = 0;
zone->compact_defer_shift = 0;
}
if (order >= zone->compact_order_failed)
zone->compact_order_failed = order + 1;
trace_mm_compaction_defer_reset(zone, order);
}
/* Returns true if restarting compaction after many failures */
bool compaction_restarting(struct zone *zone, int order)
{
if (order < zone->compact_order_failed)
return false;
return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT &&
zone->compact_considered >= 1UL << zone->compact_defer_shift;
}
/* Returns true if the pageblock should be scanned for pages to isolate. */
static inline bool isolation_suitable(struct compact_control *cc,
struct page *page)
@ -421,11 +503,12 @@ isolate_fail:
}
trace_mm_compaction_isolate_freepages(*start_pfn, blockpfn,
nr_scanned, total_isolated);
/* Record how far we have got within the block */
*start_pfn = blockpfn;
trace_mm_compaction_isolate_freepages(nr_scanned, total_isolated);
/*
* If strict isolation is requested by CMA then check that all the
* pages requested were isolated. If there were any failures, 0 is
@ -581,6 +664,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
unsigned long flags = 0;
bool locked = false;
struct page *page = NULL, *valid_page = NULL;
unsigned long start_pfn = low_pfn;
/*
* Ensure that there are not too many pages isolated from the LRU
@ -741,7 +825,8 @@ isolate_success:
if (low_pfn == end_pfn)
update_pageblock_skip(cc, valid_page, nr_isolated, true);
trace_mm_compaction_isolate_migratepages(nr_scanned, nr_isolated);
trace_mm_compaction_isolate_migratepages(start_pfn, low_pfn,
nr_scanned, nr_isolated);
count_compact_events(COMPACTMIGRATE_SCANNED, nr_scanned);
if (nr_isolated)
@ -1037,7 +1122,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
return cc->nr_migratepages ? ISOLATE_SUCCESS : ISOLATE_NONE;
}
static int compact_finished(struct zone *zone, struct compact_control *cc,
static int __compact_finished(struct zone *zone, struct compact_control *cc,
const int migratetype)
{
unsigned int order;
@ -1092,7 +1177,20 @@ static int compact_finished(struct zone *zone, struct compact_control *cc,
return COMPACT_PARTIAL;
}
return COMPACT_CONTINUE;
return COMPACT_NO_SUITABLE_PAGE;
}
static int compact_finished(struct zone *zone, struct compact_control *cc,
const int migratetype)
{
int ret;
ret = __compact_finished(zone, cc, migratetype);
trace_mm_compaction_finished(zone, cc->order, ret);
if (ret == COMPACT_NO_SUITABLE_PAGE)
ret = COMPACT_CONTINUE;
return ret;
}
/*
@ -1102,7 +1200,7 @@ static int compact_finished(struct zone *zone, struct compact_control *cc,
* COMPACT_PARTIAL - If the allocation would succeed without compaction
* COMPACT_CONTINUE - If compaction should run now
*/
unsigned long compaction_suitable(struct zone *zone, int order,
static unsigned long __compaction_suitable(struct zone *zone, int order,
int alloc_flags, int classzone_idx)
{
int fragindex;
@ -1146,11 +1244,24 @@ unsigned long compaction_suitable(struct zone *zone, int order,
*/
fragindex = fragmentation_index(zone, order);
if (fragindex >= 0 && fragindex <= sysctl_extfrag_threshold)
return COMPACT_SKIPPED;
return COMPACT_NOT_SUITABLE_ZONE;
return COMPACT_CONTINUE;
}
unsigned long compaction_suitable(struct zone *zone, int order,
int alloc_flags, int classzone_idx)
{
unsigned long ret;
ret = __compaction_suitable(zone, order, alloc_flags, classzone_idx);
trace_mm_compaction_suitable(zone, order, ret);
if (ret == COMPACT_NOT_SUITABLE_ZONE)
ret = COMPACT_SKIPPED;
return ret;
}
static int compact_zone(struct zone *zone, struct compact_control *cc)
{
int ret;
@ -1197,7 +1308,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
zone->compact_cached_migrate_pfn[1] = cc->migrate_pfn;
}
trace_mm_compaction_begin(start_pfn, cc->migrate_pfn, cc->free_pfn, end_pfn);
trace_mm_compaction_begin(start_pfn, cc->migrate_pfn,
cc->free_pfn, end_pfn, sync);
migrate_prep_local();
@ -1299,7 +1411,8 @@ out:
zone->compact_cached_free_pfn = free_pfn;
}
trace_mm_compaction_end(ret);
trace_mm_compaction_end(start_pfn, cc->migrate_pfn,
cc->free_pfn, end_pfn, sync, ret);
return ret;
}
@ -1335,22 +1448,20 @@ int sysctl_extfrag_threshold = 500;
/**
* try_to_compact_pages - Direct compact to satisfy a high-order allocation
* @zonelist: The zonelist used for the current allocation
* @order: The order of the current allocation
* @gfp_mask: The GFP mask of the current allocation
* @nodemask: The allowed nodes to allocate from
* @order: The order of the current allocation
* @alloc_flags: The allocation flags of the current allocation
* @ac: The context of current allocation
* @mode: The migration mode for async, sync light, or sync migration
* @contended: Return value that determines if compaction was aborted due to
* need_resched() or lock contention
*
* This is the main entry point for direct page compaction.
*/
unsigned long try_to_compact_pages(struct zonelist *zonelist,
int order, gfp_t gfp_mask, nodemask_t *nodemask,
enum migrate_mode mode, int *contended,
int alloc_flags, int classzone_idx)
unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
int alloc_flags, const struct alloc_context *ac,
enum migrate_mode mode, int *contended)
{
enum zone_type high_zoneidx = gfp_zone(gfp_mask);
int may_enter_fs = gfp_mask & __GFP_FS;
int may_perform_io = gfp_mask & __GFP_IO;
struct zoneref *z;
@ -1364,9 +1475,11 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
if (!order || !may_enter_fs || !may_perform_io)
return COMPACT_SKIPPED;
trace_mm_compaction_try_to_compact_pages(order, gfp_mask, mode);
/* Compact each zone in the list */
for_each_zone_zonelist_nodemask(zone, z, zonelist, high_zoneidx,
nodemask) {
for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx,
ac->nodemask) {
int status;
int zone_contended;
@ -1374,7 +1487,8 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
continue;
status = compact_zone_order(zone, order, gfp_mask, mode,
&zone_contended, alloc_flags, classzone_idx);
&zone_contended, alloc_flags,
ac->classzone_idx);
rc = max(status, rc);
/*
* It takes at least one zone that wasn't lock contended
@ -1384,7 +1498,7 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
/* If a normal allocation would succeed, stop compacting */
if (zone_watermark_ok(zone, order, low_wmark_pages(zone),
classzone_idx, alloc_flags)) {
ac->classzone_idx, alloc_flags)) {
/*
* We think the allocation will succeed in this zone,
* but it is not certain, hence the false. The caller

3
mm/debug.c
View File

@ -173,7 +173,7 @@ void dump_mm(const struct mm_struct *mm)
"get_unmapped_area %p\n"
#endif
"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
"pgd %p mm_users %d mm_count %d nr_ptes %lu map_count %d\n"
"pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
"pinned_vm %lx shared_vm %lx exec_vm %lx stack_vm %lx\n"
"start_code %lx end_code %lx start_data %lx end_data %lx\n"
@ -206,6 +206,7 @@ void dump_mm(const struct mm_struct *mm)
mm->pgd, atomic_read(&mm->mm_users),
atomic_read(&mm->mm_count),
atomic_long_read((atomic_long_t *)&mm->nr_ptes),
mm_nr_pmds((struct mm_struct *)mm),
mm->map_count,
mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
mm->pinned_vm, mm->shared_vm, mm->exec_vm, mm->stack_vm,

228
mm/gup.c
View File

@ -167,10 +167,10 @@ struct page *follow_page_mask(struct vm_area_struct *vma,
if (pud_none(*pud))
return no_page_table(vma, flags);
if (pud_huge(*pud) && vma->vm_flags & VM_HUGETLB) {
if (flags & FOLL_GET)
return NULL;
page = follow_huge_pud(mm, address, pud, flags & FOLL_WRITE);
return page;
page = follow_huge_pud(mm, address, pud, flags);
if (page)
return page;
return no_page_table(vma, flags);
}
if (unlikely(pud_bad(*pud)))
return no_page_table(vma, flags);
@ -179,19 +179,10 @@ struct page *follow_page_mask(struct vm_area_struct *vma,
if (pmd_none(*pmd))
return no_page_table(vma, flags);
if (pmd_huge(*pmd) && vma->vm_flags & VM_HUGETLB) {
page = follow_huge_pmd(mm, address, pmd, flags & FOLL_WRITE);
if (flags & FOLL_GET) {
/*
* Refcount on tail pages are not well-defined and
* shouldn't be taken. The caller should handle a NULL
* return when trying to follow tail pages.
*/
if (PageHead(page))
get_page(page);
else
page = NULL;
}
return page;
page = follow_huge_pmd(mm, address, pmd, flags);
if (page)
return page;
return no_page_table(vma, flags);
}
if ((flags & FOLL_NUMA) && pmd_numa(*pmd))
return no_page_table(vma, flags);
@ -584,6 +575,185 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
return 0;
}
static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
struct mm_struct *mm,
unsigned long start,
unsigned long nr_pages,
int write, int force,
struct page **pages,
struct vm_area_struct **vmas,
int *locked, bool notify_drop,
unsigned int flags)
{
long ret, pages_done;
bool lock_dropped;
if (locked) {
/* if VM_FAULT_RETRY can be returned, vmas become invalid */
BUG_ON(vmas);
/* check caller initialized locked */
BUG_ON(*locked != 1);
}
if (pages)
flags |= FOLL_GET;
if (write)
flags |= FOLL_WRITE;
if (force)
flags |= FOLL_FORCE;
pages_done = 0;
lock_dropped = false;
for (;;) {
ret = __get_user_pages(tsk, mm, start, nr_pages, flags, pages,
vmas, locked);
if (!locked)
/* VM_FAULT_RETRY couldn't trigger, bypass */
return ret;
/* VM_FAULT_RETRY cannot return errors */
if (!*locked) {
BUG_ON(ret < 0);
BUG_ON(ret >= nr_pages);
}
if (!pages)
/* If it's a prefault don't insist harder */
return ret;
if (ret > 0) {
nr_pages -= ret;
pages_done += ret;
if (!nr_pages)
break;
}
if (*locked) {
/* VM_FAULT_RETRY didn't trigger */
if (!pages_done)
pages_done = ret;
break;
}
/* VM_FAULT_RETRY triggered, so seek to the faulting offset */
pages += ret;
start += ret << PAGE_SHIFT;
/*
* Repeat on the address that fired VM_FAULT_RETRY
* without FAULT_FLAG_ALLOW_RETRY but with
* FAULT_FLAG_TRIED.
*/
*locked = 1;
lock_dropped = true;
down_read(&mm->mmap_sem);
ret = __get_user_pages(tsk, mm, start, 1, flags | FOLL_TRIED,
pages, NULL, NULL);
if (ret != 1) {
BUG_ON(ret > 1);
if (!pages_done)
pages_done = ret;
break;
}
nr_pages--;
pages_done++;
if (!nr_pages)
break;
pages++;
start += PAGE_SIZE;
}
if (notify_drop && lock_dropped && *locked) {
/*
* We must let the caller know we temporarily dropped the lock
* and so the critical section protected by it was lost.
*/
up_read(&mm->mmap_sem);
*locked = 0;
}
return pages_done;
}
/*
* We can leverage the VM_FAULT_RETRY functionality in the page fault
* paths better by using either get_user_pages_locked() or
* get_user_pages_unlocked().
*
* get_user_pages_locked() is suitable to replace the form:
*
* down_read(&mm->mmap_sem);
* do_something()
* get_user_pages(tsk, mm, ..., pages, NULL);
* up_read(&mm->mmap_sem);
*
* to:
*
* int locked = 1;
* down_read(&mm->mmap_sem);
* do_something()
* get_user_pages_locked(tsk, mm, ..., pages, &locked);
* if (locked)
* up_read(&mm->mmap_sem);
*/
long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
int *locked)
{
return __get_user_pages_locked(tsk, mm, start, nr_pages, write, force,
pages, NULL, locked, true, FOLL_TOUCH);
}
EXPORT_SYMBOL(get_user_pages_locked);
/*
* Same as get_user_pages_unlocked(...., FOLL_TOUCH) but it allows to
* pass additional gup_flags as last parameter (like FOLL_HWPOISON).
*
* NOTE: here FOLL_TOUCH is not set implicitly and must be set by the
* caller if required (just like with __get_user_pages). "FOLL_GET",
* "FOLL_WRITE" and "FOLL_FORCE" are set implicitly as needed
* according to the parameters "pages", "write", "force"
* respectively.
*/
__always_inline long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
unsigned int gup_flags)
{
long ret;
int locked = 1;
down_read(&mm->mmap_sem);
ret = __get_user_pages_locked(tsk, mm, start, nr_pages, write, force,
pages, NULL, &locked, false, gup_flags);
if (locked)
up_read(&mm->mmap_sem);
return ret;
}
EXPORT_SYMBOL(__get_user_pages_unlocked);
/*
* get_user_pages_unlocked() is suitable to replace the form:
*
* down_read(&mm->mmap_sem);
* get_user_pages(tsk, mm, ..., pages, NULL);
* up_read(&mm->mmap_sem);
*
* with:
*
* get_user_pages_unlocked(tsk, mm, ..., pages);
*
* It is functionally equivalent to get_user_pages_fast so
* get_user_pages_fast should be used instead, if the two parameters
* "tsk" and "mm" are respectively equal to current and current->mm,
* or if "force" shall be set to 1 (get_user_pages_fast misses the
* "force" parameter).
*/
long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages)
{
return __get_user_pages_unlocked(tsk, mm, start, nr_pages, write,
force, pages, FOLL_TOUCH);
}
EXPORT_SYMBOL(get_user_pages_unlocked);
/*
* get_user_pages() - pin user pages in memory
* @tsk: the task_struct to use for page fault accounting, or
@ -633,22 +803,18 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
* use the correct cache flushing APIs.
*
* See also get_user_pages_fast, for performance critical applications.
*
* get_user_pages should be phased out in favor of
* get_user_pages_locked|unlocked or get_user_pages_fast. Nothing
* should use get_user_pages because it cannot pass
* FAULT_FLAG_ALLOW_RETRY to handle_mm_fault.
*/
long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages, int write,
int force, struct page **pages, struct vm_area_struct **vmas)
{
int flags = FOLL_TOUCH;
if (pages)
flags |= FOLL_GET;
if (write)
flags |= FOLL_WRITE;
if (force)
flags |= FOLL_FORCE;
return __get_user_pages(tsk, mm, start, nr_pages, flags, pages, vmas,
NULL);
return __get_user_pages_locked(tsk, mm, start, nr_pages, write, force,
pages, vmas, NULL, false, FOLL_TOUCH);
}
EXPORT_SYMBOL(get_user_pages);
@ -1077,10 +1243,8 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
start += nr << PAGE_SHIFT;
pages += nr;
down_read(&mm->mmap_sem);
ret = get_user_pages(current, mm, start,
nr_pages - nr, write, 0, pages, NULL);
up_read(&mm->mmap_sem);
ret = get_user_pages_unlocked(current, mm, start,
nr_pages - nr, write, 0, pages);
/* Have to be a bit careful with return values */
if (nr > 0) {

106
mm/huge_memory.c
View File

@ -171,12 +171,7 @@ static int start_khugepaged(void)
}
static atomic_t huge_zero_refcount;
static struct page *huge_zero_page __read_mostly;
static inline bool is_huge_zero_page(struct page *page)
{
return ACCESS_ONCE(huge_zero_page) == page;
}
struct page *huge_zero_page __read_mostly;
static inline bool is_huge_zero_pmd(pmd_t pmd)
{
@ -766,15 +761,6 @@ static inline gfp_t alloc_hugepage_gfpmask(int defrag, gfp_t extra_gfp)
return (GFP_TRANSHUGE & ~(defrag ? 0 : __GFP_WAIT)) | extra_gfp;
}
static inline struct page *alloc_hugepage_vma(int defrag,
struct vm_area_struct *vma,
unsigned long haddr, int nd,
gfp_t extra_gfp)
{
return alloc_pages_vma(alloc_hugepage_gfpmask(defrag, extra_gfp),
HPAGE_PMD_ORDER, vma, haddr, nd);
}
/* Caller must hold page table lock. */
static bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
struct vm_area_struct *vma, unsigned long haddr, pmd_t *pmd,
@ -795,6 +781,7 @@ int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, pmd_t *pmd,
unsigned int flags)
{
gfp_t gfp;
struct page *page;
unsigned long haddr = address & HPAGE_PMD_MASK;
@ -829,8 +816,8 @@ int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
}
return 0;
}
page = alloc_hugepage_vma(transparent_hugepage_defrag(vma),
vma, haddr, numa_node_id(), 0);
gfp = alloc_hugepage_gfpmask(transparent_hugepage_defrag(vma), 0);
page = alloc_hugepage_vma(gfp, vma, haddr, HPAGE_PMD_ORDER);
if (unlikely(!page)) {
count_vm_event(THP_FAULT_FALLBACK);
return VM_FAULT_FALLBACK;
@ -1118,10 +1105,12 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
spin_unlock(ptl);
alloc:
if (transparent_hugepage_enabled(vma) &&
!transparent_hugepage_debug_cow())
new_page = alloc_hugepage_vma(transparent_hugepage_defrag(vma),
vma, haddr, numa_node_id(), 0);
else
!transparent_hugepage_debug_cow()) {
gfp_t gfp;
gfp = alloc_hugepage_gfpmask(transparent_hugepage_defrag(vma), 0);
new_page = alloc_hugepage_vma(gfp, vma, haddr, HPAGE_PMD_ORDER);
} else
new_page = NULL;
if (unlikely(!new_page)) {
@ -1423,26 +1412,6 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
return ret;
}
int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end,
unsigned char *vec)
{
spinlock_t *ptl;
int ret = 0;
if (__pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
/*
* All logical pages in the range are present
* if backed by a huge page.
*/
spin_unlock(ptl);
memset(vec, 1, (end - addr) >> PAGE_SHIFT);
ret = 1;
}
return ret;
}
int move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma,
unsigned long old_addr,
unsigned long new_addr, unsigned long old_end,
@ -2148,7 +2117,8 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
{
struct page *page;
pte_t *_pte;
int referenced = 0, none = 0;
int none = 0;
bool referenced = false, writable = false;
for (_pte = pte; _pte < pte+HPAGE_PMD_NR;
_pte++, address += PAGE_SIZE) {
pte_t pteval = *_pte;
@ -2158,7 +2128,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
else
goto out;
}
if (!pte_present(pteval) || !pte_write(pteval))
if (!pte_present(pteval))
goto out;
page = vm_normal_page(vma, address, pteval);
if (unlikely(!page))
@ -2168,9 +2138,6 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
VM_BUG_ON_PAGE(!PageAnon(page), page);
VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
/* cannot use mapcount: can't collapse if there's a gup pin */
if (page_count(page) != 1)
goto out;
/*
* We can do it before isolate_lru_page because the
* page can't be freed from under us. NOTE: PG_lock
@ -2179,6 +2146,29 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
*/
if (!trylock_page(page))
goto out;
/*
* cannot use mapcount: can't collapse if there's a gup pin.
* The page must only be referenced by the scanned process
* and page swap cache.
*/
if (page_count(page) != 1 + !!PageSwapCache(page)) {
unlock_page(page);
goto out;
}
if (pte_write(pteval)) {
writable = true;
} else {
if (PageSwapCache(page) && !reuse_swap_page(page)) {
unlock_page(page);
goto out;
}
/*
* Page is not in the swap cache. It can be collapsed
* into a THP.
*/
}
/*
* Isolate the page to avoid collapsing an hugepage
* currently in use by the VM.
@ -2195,9 +2185,9 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
/* If there is no mapped pte young don't collapse the page */
if (pte_young(pteval) || PageReferenced(page) ||
mmu_notifier_test_young(vma->vm_mm, address))
referenced = 1;
referenced = true;
}
if (likely(referenced))
if (likely(referenced && writable))
return 1;
out:
release_pte_pages(pte, _pte);
@ -2550,11 +2540,12 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
{
pmd_t *pmd;
pte_t *pte, *_pte;
int ret = 0, referenced = 0, none = 0;
int ret = 0, none = 0;
struct page *page;
unsigned long _address;
spinlock_t *ptl;
int node = NUMA_NO_NODE;
bool writable = false, referenced = false;
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
@ -2573,8 +2564,11 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
else
goto out_unmap;
}
if (!pte_present(pteval) || !pte_write(pteval))
if (!pte_present(pteval))
goto out_unmap;
if (pte_write(pteval))
writable = true;
page = vm_normal_page(vma, _address, pteval);
if (unlikely(!page))
goto out_unmap;
@ -2591,14 +2585,18 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
VM_BUG_ON_PAGE(PageCompound(page), page);
if (!PageLRU(page) || PageLocked(page) || !PageAnon(page))
goto out_unmap;
/* cannot use mapcount: can't collapse if there's a gup pin */
if (page_count(page) != 1)
/*
* cannot use mapcount: can't collapse if there's a gup pin.
* The page must only be referenced by the scanned process
* and page swap cache.
*/
if (page_count(page) != 1 + !!PageSwapCache(page))
goto out_unmap;
if (pte_young(pteval) || PageReferenced(page) ||
mmu_notifier_test_young(vma->vm_mm, address))
referenced = 1;
referenced = true;
}
if (referenced)
if (referenced && writable)
ret = 1;
out_unmap:
pte_unmap_unlock(pte, ptl);

168
mm/hugetlb.c
View File

@ -2657,9 +2657,10 @@ again:
goto unlock;
/*
* HWPoisoned hugepage is already unmapped and dropped reference
* Migrating hugepage or HWPoisoned hugepage is already
* unmapped and its refcount is dropped, so just clear pte here.
*/
if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) {
if (unlikely(!pte_present(pte))) {
huge_pte_clear(mm, address, ptep);
goto unlock;
}
@ -3134,6 +3135,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
struct page *pagecache_page = NULL;
struct hstate *h = hstate_vma(vma);
struct address_space *mapping;
int need_wait_lock = 0;
address &= huge_page_mask(h);
@ -3171,6 +3173,16 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
ret = 0;
/*
* entry could be a migration/hwpoison entry at this point, so this
* check prevents the kernel from going below assuming that we have
* a active hugepage in pagecache. This goto expects the 2nd page fault,
* and is_hugetlb_entry_(migration|hwpoisoned) check will properly
* handle it.
*/
if (!pte_present(entry))
goto out_mutex;
/*
* If we are going to COW the mapping later, we examine the pending
* reservations for this page now. This will ensure that any
@ -3190,30 +3202,31 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
vma, address);
}
/*
* hugetlb_cow() requires page locks of pte_page(entry) and
* pagecache_page, so here we need take the former one
* when page != pagecache_page or !pagecache_page.
* Note that locking order is always pagecache_page -> page,
* so no worry about deadlock.
*/
page = pte_page(entry);
get_page(page);
if (page != pagecache_page)
lock_page(page);
ptl = huge_pte_lock(h, mm, ptep);
ptl = huge_pte_lockptr(h, mm, ptep);
spin_lock(ptl);
/* Check for a racing update before calling hugetlb_cow */
if (unlikely(!pte_same(entry, huge_ptep_get(ptep))))
goto out_ptl;
/*
* hugetlb_cow() requires page locks of pte_page(entry) and
* pagecache_page, so here we need take the former one
* when page != pagecache_page or !pagecache_page.
*/
page = pte_page(entry);
if (page != pagecache_page)
if (!trylock_page(page)) {
need_wait_lock = 1;
goto out_ptl;
}
get_page(page);
if (flags & FAULT_FLAG_WRITE) {
if (!huge_pte_write(entry)) {
ret = hugetlb_cow(mm, vma, address, ptep, entry,
pagecache_page, ptl);
goto out_ptl;
goto out_put_page;
}
entry = huge_pte_mkdirty(entry);
}
@ -3221,7 +3234,10 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
if (huge_ptep_set_access_flags(vma, address, ptep, entry,
flags & FAULT_FLAG_WRITE))
update_mmu_cache(vma, address, ptep);
out_put_page:
if (page != pagecache_page)
unlock_page(page);
put_page(page);
out_ptl:
spin_unlock(ptl);
@ -3229,12 +3245,17 @@ out_ptl:
unlock_page(pagecache_page);
put_page(pagecache_page);
}
if (page != pagecache_page)
unlock_page(page);
put_page(page);
out_mutex:
mutex_unlock(&htlb_fault_mutex_table[hash]);
/*
* Generally it's safe to hold refcount during waiting page lock. But
* here we just wait to defer the next page fault to avoid busy loop and
* the page is not used after unlocked before returning from the current
* page fault. So we are safe from accessing freed page, even if we wait
* here without taking refcount.
*/
if (need_wait_lock)
wait_on_page_locked(page);
return ret;
}
@ -3364,7 +3385,26 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
spin_unlock(ptl);
continue;
}
if (!huge_pte_none(huge_ptep_get(ptep))) {
pte = huge_ptep_get(ptep);
if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) {
spin_unlock(ptl);
continue;
}
if (unlikely(is_hugetlb_entry_migration(pte))) {
swp_entry_t entry = pte_to_swp_entry(pte);
if (is_write_migration_entry(entry)) {
pte_t newpte;
make_migration_entry_read(&entry);
newpte = swp_entry_to_pte(entry);
set_huge_pte_at(mm, address, ptep, newpte);
pages++;
}
spin_unlock(ptl);
continue;
}
if (!huge_pte_none(pte)) {
pte = huge_ptep_get_and_clear(mm, address, ptep);
pte = pte_mkhuge(huge_pte_modify(pte, newprot));
pte = arch_make_huge_pte(pte, vma, NULL, 0);
@ -3558,6 +3598,7 @@ pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
if (saddr) {
spte = huge_pte_offset(svma->vm_mm, saddr);
if (spte) {
mm_inc_nr_pmds(mm);
get_page(virt_to_page(spte));
break;
}
@ -3569,11 +3610,13 @@ pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
ptl = huge_pte_lockptr(hstate_vma(vma), mm, spte);
spin_lock(ptl);
if (pud_none(*pud))
if (pud_none(*pud)) {
pud_populate(mm, pud,
(pmd_t *)((unsigned long)spte & PAGE_MASK));
else
} else {
put_page(virt_to_page(spte));
mm_inc_nr_pmds(mm);
}
spin_unlock(ptl);
out:
pte = (pte_t *)pmd_alloc(mm, pud, addr);
@ -3604,6 +3647,7 @@ int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
pud_clear(pud);
put_page(virt_to_page(ptep));
mm_dec_nr_pmds(mm);
*addr = ALIGN(*addr, HPAGE_SIZE * PTRS_PER_PTE) - HPAGE_SIZE;
return 1;
}
@ -3660,42 +3704,64 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
return (pte_t *) pmd;
}
struct page *
#endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
/*
* These functions are overwritable if your architecture needs its own
* behavior.
*/
struct page * __weak
follow_huge_addr(struct mm_struct *mm, unsigned long address,
int write)
{
return ERR_PTR(-EINVAL);
}
struct page * __weak
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
pmd_t *pmd, int flags)
{
struct page *page;
page = pte_page(*(pte_t *)pmd);
if (page)
page += ((address & ~PMD_MASK) >> PAGE_SHIFT);
struct page *page = NULL;
spinlock_t *ptl;
retry:
ptl = pmd_lockptr(mm, pmd);
spin_lock(ptl);
/*
* make sure that the address range covered by this pmd is not
* unmapped from other threads.
*/
if (!pmd_huge(*pmd))
goto out;
if (pmd_present(*pmd)) {
page = pte_page(*(pte_t *)pmd) +
((address & ~PMD_MASK) >> PAGE_SHIFT);
if (flags & FOLL_GET)
get_page(page);
} else {
if (is_hugetlb_entry_migration(huge_ptep_get((pte_t *)pmd))) {
spin_unlock(ptl);
__migration_entry_wait(mm, (pte_t *)pmd, ptl);
goto retry;
}
/*
* hwpoisoned entry is treated as no_page_table in
* follow_page_mask().
*/
}
out:
spin_unlock(ptl);
return page;
}
struct page *
follow_huge_pud(struct mm_struct *mm, unsigned long address,
pud_t *pud, int write)
{
struct page *page;
page = pte_page(*(pte_t *)pud);
if (page)
page += ((address & ~PUD_MASK) >> PAGE_SHIFT);
return page;
}
#else /* !CONFIG_ARCH_WANT_GENERAL_HUGETLB */
/* Can be overriden by architectures */
struct page * __weak
follow_huge_pud(struct mm_struct *mm, unsigned long address,
pud_t *pud, int write)
pud_t *pud, int flags)
{
BUG();
return NULL;
}
if (flags & FOLL_GET)
return NULL;
#endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
return pte_page(*(pte_t *)pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT);
}
#ifdef CONFIG_MEMORY_FAILURE

2
mm/hugetlb_cgroup.c
View File

@ -279,7 +279,7 @@ static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
return -EINVAL;
buf = strstrip(buf);
ret = page_counter_memparse(buf, &nr_pages);
ret = page_counter_memparse(buf, "-1", &nr_pages);
if (ret)
return ret;

22
mm/internal.h
View File

@ -109,6 +109,28 @@ extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
* in mm/page_alloc.c
*/
/*
* Structure for holding the mostly immutable allocation parameters passed
* between functions involved in allocations, including the alloc_pages*
* family of functions.
*
* nodemask, migratetype and high_zoneidx are initialized only once in
* __alloc_pages_nodemask() and then never change.
*
* zonelist, preferred_zone and classzone_idx are set first in
* __alloc_pages_nodemask() for the fast path, and might be later changed
* in __alloc_pages_slowpath(). All other functions pass the whole strucure
* by a const pointer.
*/
struct alloc_context {
struct zonelist *zonelist;
nodemask_t *nodemask;
struct zone *preferred_zone;
int classzone_idx;
int migratetype;
enum zone_type high_zoneidx;
};
/*
* Locate the struct page for both the matching buddy in our
* pair (buddy1) and the combined O(n+1) page they form (page).

716
mm/memcontrol.c
View File

File diff suppressed because it is too large Load Diff

15
mm/memory.c
View File

@ -428,6 +428,7 @@ static inline void free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
pmd = pmd_offset(pud, start);
pud_clear(pud);
pmd_free_tlb(tlb, pmd, start);
mm_dec_nr_pmds(tlb->mm);
}
static inline void free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
@ -3322,15 +3323,17 @@ int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
spin_lock(&mm->page_table_lock);
#ifndef __ARCH_HAS_4LEVEL_HACK
if (pud_present(*pud)) /* Another has populated it */
pmd_free(mm, new);
else
if (!pud_present(*pud)) {
mm_inc_nr_pmds(mm);
pud_populate(mm, pud, new);
#else
if (pgd_present(*pud)) /* Another has populated it */
} else /* Another has populated it */
pmd_free(mm, new);
else
#else
if (!pgd_present(*pud)) {
mm_inc_nr_pmds(mm);
pgd_populate(mm, pud, new);
} else /* Another has populated it */
pmd_free(mm, new);
#endif /* __ARCH_HAS_4LEVEL_HACK */
spin_unlock(&mm->page_table_lock);
return 0;

273
mm/mempolicy.c
View File

@ -471,24 +471,34 @@ static const struct mempolicy_operations mpol_ops[MPOL_MAX] = {
static void migrate_page_add(struct page *page, struct list_head *pagelist,
unsigned long flags);
struct queue_pages {
struct list_head *pagelist;
unsigned long flags;
nodemask_t *nmask;
struct vm_area_struct *prev;
};
/*
* Scan through pages checking if pages follow certain conditions,
* and move them to the pagelist if they do.
*/
static int queue_pages_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end,
const nodemask_t *nodes, unsigned long flags,
void *private)
static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
unsigned long end, struct mm_walk *walk)
{
pte_t *orig_pte;
struct vm_area_struct *vma = walk->vma;
struct page *page;
struct queue_pages *qp = walk->private;
unsigned long flags = qp->flags;
int nid;
pte_t *pte;
spinlock_t *ptl;
orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
do {
struct page *page;
int nid;
split_huge_page_pmd(vma, addr, pmd);
if (pmd_trans_unstable(pmd))
return 0;
pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
for (; addr != end; pte++, addr += PAGE_SIZE) {
if (!pte_present(*pte))
continue;
page = vm_normal_page(vma, addr, *pte);
@ -501,114 +511,46 @@ static int queue_pages_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
if (PageReserved(page))
continue;
nid = page_to_nid(page);
if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT))
continue;
if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
migrate_page_add(page, private, flags);
else
break;
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap_unlock(orig_pte, ptl);
return addr != end;
migrate_page_add(page, qp->pagelist, flags);
}
pte_unmap_unlock(pte - 1, ptl);
cond_resched();
return 0;
}
static void queue_pages_hugetlb_pmd_range(struct vm_area_struct *vma,
pmd_t *pmd, const nodemask_t *nodes, unsigned long flags,
void *private)
static int queue_pages_hugetlb(pte_t *pte, unsigned long hmask,
unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
#ifdef CONFIG_HUGETLB_PAGE
struct queue_pages *qp = walk->private;
unsigned long flags = qp->flags;
int nid;
struct page *page;
spinlock_t *ptl;
pte_t entry;
ptl = huge_pte_lock(hstate_vma(vma), vma->vm_mm, (pte_t *)pmd);
entry = huge_ptep_get((pte_t *)pmd);
ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte);
entry = huge_ptep_get(pte);
if (!pte_present(entry))
goto unlock;
page = pte_page(entry);
nid = page_to_nid(page);
if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT))
goto unlock;
/* With MPOL_MF_MOVE, we migrate only unshared hugepage. */
if (flags & (MPOL_MF_MOVE_ALL) ||
(flags & MPOL_MF_MOVE && page_mapcount(page) == 1))
isolate_huge_page(page, private);
isolate_huge_page(page, qp->pagelist);
unlock:
spin_unlock(ptl);
#else
BUG();
#endif
}
static inline int queue_pages_pmd_range(struct vm_area_struct *vma, pud_t *pud,
unsigned long addr, unsigned long end,
const nodemask_t *nodes, unsigned long flags,
void *private)
{
pmd_t *pmd;
unsigned long next;
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
if (!pmd_present(*pmd))
continue;
if (pmd_huge(*pmd) && is_vm_hugetlb_page(vma)) {
queue_pages_hugetlb_pmd_range(vma, pmd, nodes,
flags, private);
continue;
}
split_huge_page_pmd(vma, addr, pmd);
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
continue;
if (queue_pages_pte_range(vma, pmd, addr, next, nodes,
flags, private))
return -EIO;
} while (pmd++, addr = next, addr != end);
return 0;
}
static inline int queue_pages_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
unsigned long addr, unsigned long end,
const nodemask_t *nodes, unsigned long flags,
void *private)
{
pud_t *pud;
unsigned long next;
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
if (pud_huge(*pud) && is_vm_hugetlb_page(vma))
continue;
if (pud_none_or_clear_bad(pud))
continue;
if (queue_pages_pmd_range(vma, pud, addr, next, nodes,
flags, private))
return -EIO;
} while (pud++, addr = next, addr != end);
return 0;
}
static inline int queue_pages_pgd_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long end,
const nodemask_t *nodes, unsigned long flags,
void *private)
{
pgd_t *pgd;
unsigned long next;
pgd = pgd_offset(vma->vm_mm, addr);
do {
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
if (queue_pages_pud_range(vma, pgd, addr, next, nodes,
flags, private))
return -EIO;
} while (pgd++, addr = next, addr != end);
return 0;
}
@ -641,6 +583,49 @@ static unsigned long change_prot_numa(struct vm_area_struct *vma,
}
#endif /* CONFIG_NUMA_BALANCING */
static int queue_pages_test_walk(unsigned long start, unsigned long end,
struct mm_walk *walk)
{
struct vm_area_struct *vma = walk->vma;
struct queue_pages *qp = walk->private;
unsigned long endvma = vma->vm_end;
unsigned long flags = qp->flags;
if (vma->vm_flags & VM_PFNMAP)
return 1;
if (endvma > end)
endvma = end;
if (vma->vm_start > start)
start = vma->vm_start;
if (!(flags & MPOL_MF_DISCONTIG_OK)) {
if (!vma->vm_next && vma->vm_end < end)
return -EFAULT;
if (qp->prev && qp->prev->vm_end < vma->vm_start)
return -EFAULT;
}
qp->prev = vma;
if (vma->vm_flags & VM_PFNMAP)
return 1;
if (flags & MPOL_MF_LAZY) {
/* Similar to task_numa_work, skip inaccessible VMAs */
if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
change_prot_numa(vma, start, endvma);
return 1;
}
if ((flags & MPOL_MF_STRICT) ||
((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) &&
vma_migratable(vma)))
/* queue pages from current vma */
return 0;
return 1;
}
/*
* Walk through page tables and collect pages to be migrated.
*
@ -650,50 +635,24 @@ static unsigned long change_prot_numa(struct vm_area_struct *vma,
*/
static int
queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
const nodemask_t *nodes, unsigned long flags, void *private)
nodemask_t *nodes, unsigned long flags,
struct list_head *pagelist)
{
int err = 0;
struct vm_area_struct *vma, *prev;
struct queue_pages qp = {
.pagelist = pagelist,
.flags = flags,
.nmask = nodes,
.prev = NULL,
};
struct mm_walk queue_pages_walk = {
.hugetlb_entry = queue_pages_hugetlb,
.pmd_entry = queue_pages_pte_range,
.test_walk = queue_pages_test_walk,
.mm = mm,
.private = &qp,
};
vma = find_vma(mm, start);
if (!vma)
return -EFAULT;
prev = NULL;
for (; vma && vma->vm_start < end; vma = vma->vm_next) {
unsigned long endvma = vma->vm_end;
if (endvma > end)
endvma = end;
if (vma->vm_start > start)
start = vma->vm_start;
if (!(flags & MPOL_MF_DISCONTIG_OK)) {
if (!vma->vm_next && vma->vm_end < end)
return -EFAULT;
if (prev && prev->vm_end < vma->vm_start)
return -EFAULT;
}
if (flags & MPOL_MF_LAZY) {
/* Similar to task_numa_work, skip inaccessible VMAs */
if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
change_prot_numa(vma, start, endvma);
goto next;
}
if ((flags & MPOL_MF_STRICT) ||
((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) &&
vma_migratable(vma))) {
err = queue_pages_pgd_range(vma, start, endvma, nodes,
flags, private);
if (err)
break;
}
next:
prev = vma;
}
return err;
return walk_page_range(start, end, &queue_pages_walk);
}
/*
@ -1988,43 +1947,63 @@ static struct page *alloc_page_interleave(gfp_t gfp, unsigned order,
* @order:Order of the GFP allocation.
* @vma: Pointer to VMA or NULL if not available.
* @addr: Virtual Address of the allocation. Must be inside the VMA.
* @node: Which node to prefer for allocation (modulo policy).
* @hugepage: for hugepages try only the preferred node if possible
*
* This function allocates a page from the kernel page pool and applies
* a NUMA policy associated with the VMA or the current process.
* When VMA is not NULL caller must hold down_read on the mmap_sem of the
* mm_struct of the VMA to prevent it from going away. Should be used for
* all allocations for pages that will be mapped into
* user space. Returns NULL when no page can be allocated.
*
* Should be called with the mm_sem of the vma hold.
* all allocations for pages that will be mapped into user space. Returns
* NULL when no page can be allocated.
*/
struct page *
alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma,
unsigned long addr, int node)
unsigned long addr, int node, bool hugepage)
{
struct mempolicy *pol;
struct page *page;
unsigned int cpuset_mems_cookie;
struct zonelist *zl;
nodemask_t *nmask;
retry_cpuset:
pol = get_vma_policy(vma, addr);
cpuset_mems_cookie = read_mems_allowed_begin();
if (unlikely(pol->mode == MPOL_INTERLEAVE)) {
if (unlikely(IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && hugepage &&
pol->mode != MPOL_INTERLEAVE)) {
/*
* For hugepage allocation and non-interleave policy which
* allows the current node, we only try to allocate from the
* current node and don't fall back to other nodes, as the
* cost of remote accesses would likely offset THP benefits.
*
* If the policy is interleave, or does not allow the current
* node in its nodemask, we allocate the standard way.
*/
nmask = policy_nodemask(gfp, pol);
if (!nmask || node_isset(node, *nmask)) {
mpol_cond_put(pol);
page = alloc_pages_exact_node(node, gfp, order);
goto out;
}
}
if (pol->mode == MPOL_INTERLEAVE) {
unsigned nid;
nid = interleave_nid(pol, vma, addr, PAGE_SHIFT + order);
mpol_cond_put(pol);
page = alloc_page_interleave(gfp, order, nid);
if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie)))
goto retry_cpuset;
return page;
goto out;
}
page = __alloc_pages_nodemask(gfp, order,
policy_zonelist(gfp, pol, node),
policy_nodemask(gfp, pol));
nmask = policy_nodemask(gfp, pol);
zl = policy_zonelist(gfp, pol, node);
mpol_cond_put(pol);
page = __alloc_pages_nodemask(gfp, order, zl, nmask);
out:
if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie)))
goto retry_cpuset;
return page;

5
mm/migrate.c
View File

@ -197,7 +197,7 @@ static void remove_migration_ptes(struct page *old, struct page *new)
* get to the page and wait until migration is finished.
* When we return from this function the fault will be retried.
*/
static void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
spinlock_t *ptl)
{
pte_t pte;
@ -1236,7 +1236,8 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
goto put_and_set;
if (PageHuge(page)) {
isolate_huge_page(page, &pagelist);
if (PageHead(page))
isolate_huge_page(page, &pagelist);
goto put_and_set;
}

170
mm/mincore.c
View File

@ -19,38 +19,25 @@
#include <asm/uaccess.h>
#include <asm/pgtable.h>
static void mincore_hugetlb_page_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long end,
unsigned char *vec)
static int mincore_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr,
unsigned long end, struct mm_walk *walk)
{
#ifdef CONFIG_HUGETLB_PAGE
struct hstate *h;
unsigned char present;
unsigned char *vec = walk->private;
h = hstate_vma(vma);
while (1) {
unsigned char present;
pte_t *ptep;
/*
* Huge pages are always in RAM for now, but
* theoretically it needs to be checked.
*/
ptep = huge_pte_offset(current->mm,
addr & huge_page_mask(h));
present = ptep && !huge_pte_none(huge_ptep_get(ptep));
while (1) {
*vec = present;
vec++;
addr += PAGE_SIZE;
if (addr == end)
return;
/* check hugepage border */
if (!(addr & ~huge_page_mask(h)))
break;
}
}
/*
* Hugepages under user process are always in RAM and never
* swapped out, but theoretically it needs to be checked.
*/
present = pte && !huge_pte_none(huge_ptep_get(pte));
for (; addr != end; vec++, addr += PAGE_SIZE)
*vec = present;
walk->private = vec;
#else
BUG();
#endif
return 0;
}
/*
@ -94,9 +81,8 @@ static unsigned char mincore_page(struct address_space *mapping, pgoff_t pgoff)
return present;
}
static void mincore_unmapped_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long end,
unsigned char *vec)
static int __mincore_unmapped_range(unsigned long addr, unsigned long end,
struct vm_area_struct *vma, unsigned char *vec)
{
unsigned long nr = (end - addr) >> PAGE_SHIFT;
int i;
@ -111,23 +97,44 @@ static void mincore_unmapped_range(struct vm_area_struct *vma,
for (i = 0; i < nr; i++)
vec[i] = 0;
}
return nr;
}
static void mincore_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end,
unsigned char *vec)
static int mincore_unmapped_range(unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
unsigned long next;
spinlock_t *ptl;
pte_t *ptep;
walk->private += __mincore_unmapped_range(addr, end,
walk->vma, walk->private);
return 0;
}
ptep = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
do {
static int mincore_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
struct mm_walk *walk)
{
spinlock_t *ptl;
struct vm_area_struct *vma = walk->vma;
pte_t *ptep;
unsigned char *vec = walk->private;
int nr = (end - addr) >> PAGE_SHIFT;
if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
memset(vec, 1, nr);
spin_unlock(ptl);
goto out;
}
if (pmd_trans_unstable(pmd)) {
__mincore_unmapped_range(addr, end, vma, vec);
goto out;
}
ptep = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
for (; addr != end; ptep++, addr += PAGE_SIZE) {
pte_t pte = *ptep;
next = addr + PAGE_SIZE;
if (pte_none(pte))
mincore_unmapped_range(vma, addr, next, vec);
__mincore_unmapped_range(addr, addr + PAGE_SIZE,
vma, vec);
else if (pte_present(pte))
*vec = 1;
else { /* pte is a swap entry */
@ -150,69 +157,12 @@ static void mincore_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
}
}
vec++;
} while (ptep++, addr = next, addr != end);
}
pte_unmap_unlock(ptep - 1, ptl);
}
static void mincore_pmd_range(struct vm_area_struct *vma, pud_t *pud,
unsigned long addr, unsigned long end,
unsigned char *vec)
{
unsigned long next;
pmd_t *pmd;
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
if (pmd_trans_huge(*pmd)) {
if (mincore_huge_pmd(vma, pmd, addr, next, vec)) {
vec += (next - addr) >> PAGE_SHIFT;
continue;
}
/* fall through */
}
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
mincore_unmapped_range(vma, addr, next, vec);
else
mincore_pte_range(vma, pmd, addr, next, vec);
vec += (next - addr) >> PAGE_SHIFT;
} while (pmd++, addr = next, addr != end);
}
static void mincore_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
unsigned long addr, unsigned long end,
unsigned char *vec)
{
unsigned long next;
pud_t *pud;
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
mincore_unmapped_range(vma, addr, next, vec);
else
mincore_pmd_range(vma, pud, addr, next, vec);
vec += (next - addr) >> PAGE_SHIFT;
} while (pud++, addr = next, addr != end);
}
static void mincore_page_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long end,
unsigned char *vec)
{
unsigned long next;
pgd_t *pgd;
pgd = pgd_offset(vma->vm_mm, addr);
do {
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
mincore_unmapped_range(vma, addr, next, vec);
else
mincore_pud_range(vma, pgd, addr, next, vec);
vec += (next - addr) >> PAGE_SHIFT;
} while (pgd++, addr = next, addr != end);
out:
walk->private += nr;
cond_resched();
return 0;
}
/*
@ -224,18 +174,22 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
{
struct vm_area_struct *vma;
unsigned long end;
int err;
struct mm_walk mincore_walk = {
.pmd_entry = mincore_pte_range,
.pte_hole = mincore_unmapped_range,
.hugetlb_entry = mincore_hugetlb,
.private = vec,
};
vma = find_vma(current->mm, addr);
if (!vma || addr < vma->vm_start)
return -ENOMEM;
mincore_walk.mm = vma->vm_mm;
end = min(vma->vm_end, addr + (pages << PAGE_SHIFT));
if (is_vm_hugetlb_page(vma))
mincore_hugetlb_page_range(vma, addr, end, vec);
else
mincore_page_range(vma, addr, end, vec);
err = walk_page_range(addr, end, &mincore_walk);
if (err < 0)
return err;
return (end - addr) >> PAGE_SHIFT;
}

7
mm/mmap.c
View File

@ -152,7 +152,7 @@ EXPORT_SYMBOL_GPL(vm_memory_committed);
*/
int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
{
unsigned long free, allowed, reserve;
long free, allowed, reserve;
VM_WARN_ONCE(percpu_counter_read(&vm_committed_as) <
-(s64)vm_committed_as_batch * num_online_cpus(),
@ -220,7 +220,7 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
*/
if (mm) {
reserve = sysctl_user_reserve_kbytes >> (PAGE_SHIFT - 10);
allowed -= min(mm->total_vm / 32, reserve);
allowed -= min_t(long, mm->total_vm / 32, reserve);
}
if (percpu_counter_read_positive(&vm_committed_as) < allowed)
@ -2851,9 +2851,6 @@ void exit_mmap(struct mm_struct *mm)
vma = remove_vma(vma);
}
vm_unacct_memory(nr_accounted);
WARN_ON(atomic_long_read(&mm->nr_ptes) >
(FIRST_USER_ADDRESS+PMD_SIZE-1)>>PMD_SHIFT);
}
/* Insert vm structure into process list sorted by address

4
mm/mmzone.c
View File

@ -54,8 +54,7 @@ static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
/* Returns the next zone at or below highest_zoneidx in a zonelist */
struct zoneref *next_zones_zonelist(struct zoneref *z,
enum zone_type highest_zoneidx,
nodemask_t *nodes,
struct zone **zone)
nodemask_t *nodes)
{
/*
* Find the next suitable zone to use for the allocation.
@ -69,7 +68,6 @@ struct zoneref *next_zones_zonelist(struct zoneref *z,
(z->zone && !zref_in_nodemask(z, nodes)))
z++;
*zone = zonelist_zone(z);
return z;
}

37
mm/nommu.c
View File

@ -214,6 +214,39 @@ long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
}
EXPORT_SYMBOL(get_user_pages);
long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
int *locked)
{
return get_user_pages(tsk, mm, start, nr_pages, write, force,
pages, NULL);
}
EXPORT_SYMBOL(get_user_pages_locked);
long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
unsigned int gup_flags)
{
long ret;
down_read(&mm->mmap_sem);
ret = get_user_pages(tsk, mm, start, nr_pages, write, force,
pages, NULL);
up_read(&mm->mmap_sem);
return ret;
}
EXPORT_SYMBOL(__get_user_pages_unlocked);
long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages)
{
return __get_user_pages_unlocked(tsk, mm, start, nr_pages, write,
force, pages, 0);
}
EXPORT_SYMBOL(get_user_pages_unlocked);
/**
* follow_pfn - look up PFN at a user virtual address
* @vma: memory mapping
@ -1895,7 +1928,7 @@ EXPORT_SYMBOL(unmap_mapping_range);
*/
int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
{
unsigned long free, allowed, reserve;
long free, allowed, reserve;
vm_acct_memory(pages);
@ -1959,7 +1992,7 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
*/
if (mm) {
reserve = sysctl_user_reserve_kbytes >> (PAGE_SHIFT - 10);
allowed -= min(mm->total_vm / 32, reserve);
allowed -= min_t(long, mm->total_vm / 32, reserve);
}
if (percpu_counter_read_positive(&vm_committed_as) < allowed)

169
mm/oom_kill.c
View File

@ -169,8 +169,8 @@ unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
* The baseline for the badness score is the proportion of RAM that each
* task's rss, pagetable and swap space use.
*/
points = get_mm_rss(p->mm) + atomic_long_read(&p->mm->nr_ptes) +
get_mm_counter(p->mm, MM_SWAPENTS);
points = get_mm_rss(p->mm) + get_mm_counter(p->mm, MM_SWAPENTS) +
atomic_long_read(&p->mm->nr_ptes) + mm_nr_pmds(p->mm);
task_unlock(p);
/*
@ -266,8 +266,6 @@ enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
* Don't allow any other task to have access to the reserves.
*/
if (test_tsk_thread_flag(task, TIF_MEMDIE)) {
if (unlikely(frozen(task)))
__thaw_task(task);
if (!force_kill)
return OOM_SCAN_ABORT;
}
@ -353,7 +351,7 @@ static void dump_tasks(struct mem_cgroup *memcg, const nodemask_t *nodemask)
struct task_struct *p;
struct task_struct *task;
pr_info("[ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name\n");
pr_info("[ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name\n");
rcu_read_lock();
for_each_process(p) {
if (oom_unkillable_task(p, memcg, nodemask))
@ -369,10 +367,11 @@ static void dump_tasks(struct mem_cgroup *memcg, const nodemask_t *nodemask)
continue;
}
pr_info("[%5d] %5d %5d %8lu %8lu %7ld %8lu %5hd %s\n",
pr_info("[%5d] %5d %5d %8lu %8lu %7ld %7ld %8lu %5hd %s\n",
task->pid, from_kuid(&init_user_ns, task_uid(task)),
task->tgid, task->mm->total_vm, get_mm_rss(task->mm),
atomic_long_read(&task->mm->nr_ptes),
mm_nr_pmds(task->mm),
get_mm_counter(task->mm, MM_SWAPENTS),
task->signal->oom_score_adj, task->comm);
task_unlock(task);
@ -400,20 +399,98 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
}
/*
* Number of OOM killer invocations (including memcg OOM killer).
* Primarily used by PM freezer to check for potential races with
* OOM killed frozen task.
* Number of OOM victims in flight
*/
static atomic_t oom_kills = ATOMIC_INIT(0);
static atomic_t oom_victims = ATOMIC_INIT(0);
static DECLARE_WAIT_QUEUE_HEAD(oom_victims_wait);
int oom_kills_count(void)
bool oom_killer_disabled __read_mostly;
static DECLARE_RWSEM(oom_sem);
/**
* mark_tsk_oom_victim - marks the given taks as OOM victim.
* @tsk: task to mark
*
* Has to be called with oom_sem taken for read and never after
* oom has been disabled already.
*/
void mark_tsk_oom_victim(struct task_struct *tsk)
{
return atomic_read(&oom_kills);
WARN_ON(oom_killer_disabled);
/* OOM killer might race with memcg OOM */
if (test_and_set_tsk_thread_flag(tsk, TIF_MEMDIE))
return;
/*
* Make sure that the task is woken up from uninterruptible sleep
* if it is frozen because OOM killer wouldn't be able to free
* any memory and livelock. freezing_slow_path will tell the freezer
* that TIF_MEMDIE tasks should be ignored.
*/
__thaw_task(tsk);
atomic_inc(&oom_victims);
}
void note_oom_kill(void)
/**
* unmark_oom_victim - unmarks the current task as OOM victim.
*
* Wakes up all waiters in oom_killer_disable()
*/
void unmark_oom_victim(void)
{
atomic_inc(&oom_kills);
if (!test_and_clear_thread_flag(TIF_MEMDIE))
return;
down_read(&oom_sem);
/*
* There is no need to signal the lasst oom_victim if there
* is nobody who cares.
*/
if (!atomic_dec_return(&oom_victims) && oom_killer_disabled)
wake_up_all(&oom_victims_wait);
up_read(&oom_sem);
}
/**
* oom_killer_disable - disable OOM killer
*
* Forces all page allocations to fail rather than trigger OOM killer.
* Will block and wait until all OOM victims are killed.
*
* The function cannot be called when there are runnable user tasks because
* the userspace would see unexpected allocation failures as a result. Any
* new usage of this function should be consulted with MM people.
*
* Returns true if successful and false if the OOM killer cannot be
* disabled.
*/
bool oom_killer_disable(void)
{
/*
* Make sure to not race with an ongoing OOM killer
* and that the current is not the victim.
*/
down_write(&oom_sem);
if (test_thread_flag(TIF_MEMDIE)) {
up_write(&oom_sem);
return false;
}
oom_killer_disabled = true;
up_write(&oom_sem);
wait_event(oom_victims_wait, !atomic_read(&oom_victims));
return true;
}
/**
* oom_killer_enable - enable OOM killer
*/
void oom_killer_enable(void)
{
down_write(&oom_sem);
oom_killer_disabled = false;
up_write(&oom_sem);
}
#define K(x) ((x) << (PAGE_SHIFT-10))
@ -438,11 +515,14 @@ void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
* If the task is already exiting, don't alarm the sysadmin or kill
* its children or threads, just set TIF_MEMDIE so it can die quickly
*/
if (task_will_free_mem(p)) {
set_tsk_thread_flag(p, TIF_MEMDIE);
task_lock(p);
if (p->mm && task_will_free_mem(p)) {
mark_tsk_oom_victim(p);
task_unlock(p);
put_task_struct(p);
return;
}
task_unlock(p);
if (__ratelimit(&oom_rs))
dump_header(p, gfp_mask, order, memcg, nodemask);
@ -492,6 +572,7 @@ void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
/* mm cannot safely be dereferenced after task_unlock(victim) */
mm = victim->mm;
mark_tsk_oom_victim(victim);
pr_err("Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB\n",
task_pid_nr(victim), victim->comm, K(victim->mm->total_vm),
K(get_mm_counter(victim->mm, MM_ANONPAGES)),
@ -522,7 +603,6 @@ void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
}
rcu_read_unlock();
set_tsk_thread_flag(victim, TIF_MEMDIE);
do_send_sig_info(SIGKILL, SEND_SIG_FORCED, victim, true);
put_task_struct(victim);
}
@ -611,7 +691,7 @@ void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_mask)
}
/**
* out_of_memory - kill the "best" process when we run out of memory
* __out_of_memory - kill the "best" process when we run out of memory
* @zonelist: zonelist pointer
* @gfp_mask: memory allocation flags
* @order: amount of memory being requested as a power of 2
@ -623,7 +703,7 @@ void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_mask)
* OR try to be smart about which process to kill. Note that we
* don't have to be perfect here, we just have to be good.
*/
void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
static void __out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
int order, nodemask_t *nodemask, bool force_kill)
{
const nodemask_t *mpol_mask;
@ -643,9 +723,13 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
* If current has a pending SIGKILL or is exiting, then automatically
* select it. The goal is to allow it to allocate so that it may
* quickly exit and free its memory.
*
* But don't select if current has already released its mm and cleared
* TIF_MEMDIE flag at exit_mm(), otherwise an OOM livelock may occur.
*/
if (fatal_signal_pending(current) || task_will_free_mem(current)) {
set_thread_flag(TIF_MEMDIE);
if (current->mm &&
(fatal_signal_pending(current) || task_will_free_mem(current))) {
mark_tsk_oom_victim(current);
return;
}
@ -688,6 +772,32 @@ out:
schedule_timeout_killable(1);
}
/**
* out_of_memory - tries to invoke OOM killer.
* @zonelist: zonelist pointer
* @gfp_mask: memory allocation flags
* @order: amount of memory being requested as a power of 2
* @nodemask: nodemask passed to page allocator
* @force_kill: true if a task must be killed, even if others are exiting
*
* invokes __out_of_memory if the OOM is not disabled by oom_killer_disable()
* when it returns false. Otherwise returns true.
*/
bool out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
int order, nodemask_t *nodemask, bool force_kill)
{
bool ret = false;
down_read(&oom_sem);
if (!oom_killer_disabled) {
__out_of_memory(zonelist, gfp_mask, order, nodemask, force_kill);
ret = true;
}
up_read(&oom_sem);
return ret;
}
/*
* The pagefault handler calls here because it is out of memory, so kill a
* memory-hogging task. If any populated zone has ZONE_OOM_LOCKED set, a
@ -697,12 +807,25 @@ void pagefault_out_of_memory(void)
{
struct zonelist *zonelist;
down_read(&oom_sem);
if (mem_cgroup_oom_synchronize(true))
return;
goto unlock;
zonelist = node_zonelist(first_memory_node, GFP_KERNEL);
if (oom_zonelist_trylock(zonelist, GFP_KERNEL)) {
out_of_memory(NULL, 0, 0, NULL, false);
if (!oom_killer_disabled)
__out_of_memory(NULL, 0, 0, NULL, false);
else
/*
* There shouldn't be any user tasks runable while the
* OOM killer is disabled so the current task has to
* be a racing OOM victim for which oom_killer_disable()
* is waiting for.
*/
WARN_ON(test_thread_flag(TIF_MEMDIE));
oom_zonelist_unlock(zonelist, GFP_KERNEL);
}
unlock:
up_read(&oom_sem);
}

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