korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 04:18:39 +08:00
Code Issues Packages Projects Releases Wiki Activity

thp: pte alloc trans splitting

Browse Source 
pte alloc routines must wait for split_huge_page if the pmd is not present
and not null (i.e.  pmd_trans_splitting).  The additional branches are
optimized away at compile time by pmd_trans_splitting if the config option
is off.  However we must pass the vma down in order to know the anon_vma
lock to wait for.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli 2011-01-13 15:46:43 -08:00 committed by Linus Torvalds
parent 64cc6ae001
commit 8ac1f8320a
11 changed files with 35 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/mm/pgd.c
View File

@ -50,7 +50,7 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
if (!new_pmd)
goto no_pmd;
new_pte = pte_alloc_map(mm, new_pmd, 0);
new_pte = pte_alloc_map(mm, NULL, new_pmd, 0);
if (!new_pte)
goto no_pte;

2
arch/ia64/mm/hugetlbpage.c
View File

@ -38,7 +38,7 @@ huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz)
if (pud) {
pmd = pmd_alloc(mm, pud, taddr);
if (pmd)
pte = pte_alloc_map(mm, pmd, taddr);
pte = pte_alloc_map(mm, NULL, pmd, taddr);
}
return pte;
}

2
arch/sh/mm/hugetlbpage.c
View File

@ -35,7 +35,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
if (pud) {
pmd = pmd_alloc(mm, pud, addr);
if (pmd)
pte = pte_alloc_map(mm, pmd, addr);
pte = pte_alloc_map(mm, NULL, pmd, addr);
}
}

2
arch/sparc/mm/generic_32.c
View File

@ -50,7 +50,7 @@ static inline int io_remap_pmd_range(struct mm_struct *mm, pmd_t * pmd, unsigned
end = PGDIR_SIZE;
offset -= address;
do {
pte_t * pte = pte_alloc_map(mm, pmd, address);
pte_t *pte = pte_alloc_map(mm, NULL, pmd, address);
if (!pte)
return -ENOMEM;
io_remap_pte_range(mm, pte, address, end - address, address + offset, prot, space);

2
arch/sparc/mm/generic_64.c
View File

@ -92,7 +92,7 @@ static inline int io_remap_pmd_range(struct mm_struct *mm, pmd_t * pmd, unsigned
end = PGDIR_SIZE;
offset -= address;
do {
pte_t * pte = pte_alloc_map(mm, pmd, address);
pte_t *pte = pte_alloc_map(mm, NULL, pmd, address);
if (!pte)
return -ENOMEM;
io_remap_pte_range(mm, pte, address, end - address, address + offset, prot, space);

2
arch/sparc/mm/hugetlbpage.c
View File

@ -214,7 +214,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
if (pud) {
pmd = pmd_alloc(mm, pud, addr);
if (pmd)
pte = pte_alloc_map(mm, pmd, addr);
pte = pte_alloc_map(mm, NULL, pmd, addr);
}
return pte;
}

2
arch/um/kernel/skas/mmu.c
View File

@ -31,7 +31,7 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
if (!pmd)
goto out_pmd;
pte = pte_alloc_map(mm, pmd, proc);
pte = pte_alloc_map(mm, NULL, pmd, proc);
if (!pte)
goto out_pte;

2
arch/x86/kernel/tboot.c
View File

@ -133,7 +133,7 @@ static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
pmd = pmd_alloc(&tboot_mm, pud, vaddr);
if (!pmd)
return -1;
pte = pte_alloc_map(&tboot_mm, pmd, vaddr);
pte = pte_alloc_map(&tboot_mm, NULL, pmd, vaddr);
if (!pte)
return -1;
set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));

15
include/linux/mm.h
View File

@ -1131,7 +1131,8 @@ static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
#endif
int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
pmd_t *pmd, unsigned long address);
int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
/*
@ -1200,16 +1201,18 @@ static inline void pgtable_page_dtor(struct page *page)
pte_unmap(pte); \
} while (0)
#define pte_alloc_map(mm, pmd, address) \
((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
NULL: pte_offset_map(pmd, address))
#define pte_alloc_map(mm, vma, pmd, address) \
((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \
pmd, address))? \
NULL: pte_offset_map(pmd, address))
#define pte_alloc_map_lock(mm, pmd, address, ptlp) \
((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \
pmd, address))? \
NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
#define pte_alloc_kernel(pmd, address) \
((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
NULL: pte_offset_kernel(pmd, address))
extern void free_area_init(unsigned long * zones_size);

19
mm/memory.c
View File

@ -394,9 +394,11 @@ void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *vma,
}
}
int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address)
int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
pmd_t *pmd, unsigned long address)
{
pgtable_t new = pte_alloc_one(mm, address);
int wait_split_huge_page;
if (!new)
return -ENOMEM;
@ -416,14 +418,18 @@ int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address)
smp_wmb(); /* Could be smp_wmb__xxx(before|after)_spin_lock */
spin_lock(&mm->page_table_lock);
if (!pmd_present(*pmd)) { /* Has another populated it ? */
wait_split_huge_page = 0;
if (likely(pmd_none(*pmd))) { /* Has another populated it ? */
mm->nr_ptes++;
pmd_populate(mm, pmd, new);
new = NULL;
}
} else if (unlikely(pmd_trans_splitting(*pmd)))
wait_split_huge_page = 1;
spin_unlock(&mm->page_table_lock);
if (new)
pte_free(mm, new);
if (wait_split_huge_page)
wait_split_huge_page(vma->anon_vma, pmd);
return 0;
}
@ -436,10 +442,11 @@ int __pte_alloc_kernel(pmd_t *pmd, unsigned long address)
smp_wmb(); /* See comment in __pte_alloc */
spin_lock(&init_mm.page_table_lock);
if (!pmd_present(*pmd)) { /* Has another populated it ? */
if (likely(pmd_none(*pmd))) { /* Has another populated it ? */
pmd_populate_kernel(&init_mm, pmd, new);
new = NULL;
}
} else
VM_BUG_ON(pmd_trans_splitting(*pmd));
spin_unlock(&init_mm.page_table_lock);
if (new)
pte_free_kernel(&init_mm, new);
@ -3253,7 +3260,7 @@ int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
pmd = pmd_alloc(mm, pud, address);
if (!pmd)
return VM_FAULT_OOM;
pte = pte_alloc_map(mm, pmd, address);
pte = pte_alloc_map(mm, vma, pmd, address);
if (!pte)
return VM_FAULT_OOM;

8
mm/mremap.c
View File

@ -47,7 +47,8 @@ static pmd_t *get_old_pmd(struct mm_struct *mm, unsigned long addr)
return pmd;
}
static pmd_t *alloc_new_pmd(struct mm_struct *mm, unsigned long addr)
static pmd_t *alloc_new_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr)
{
pgd_t *pgd;
pud_t *pud;
@ -62,7 +63,8 @@ static pmd_t *alloc_new_pmd(struct mm_struct *mm, unsigned long addr)
if (!pmd)
return NULL;
if (!pmd_present(*pmd) && __pte_alloc(mm, pmd, addr))
VM_BUG_ON(pmd_trans_huge(*pmd));
if (pmd_none(*pmd) && __pte_alloc(mm, vma, pmd, addr))
return NULL;
return pmd;
@ -147,7 +149,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
old_pmd = get_old_pmd(vma->vm_mm, old_addr);
if (!old_pmd)
continue;
new_pmd = alloc_new_pmd(vma->vm_mm, new_addr);
new_pmd = alloc_new_pmd(vma->vm_mm, vma, new_addr);
if (!new_pmd)
break;
next = (new_addr + PMD_SIZE) & PMD_MASK;