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mm: thp: support "THPeligible" semantics for mTHP with anonymous shmem

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After the commit 7fb1b252af ("mm: shmem: add mTHP support for anonymous
shmem"), we can configure different policies through the multi-size THP
sysfs interface for anonymous shmem.  But currently "THPeligible"
indicates only whether the mapping is eligible for allocating THP-pages as
well as the THP is PMD mappable or not for anonymous shmem, we need to
support semantics for mTHP with anonymous shmem similar to those for mTHP
with anonymous memory.

Link: https://lkml.kernel.org/r/20240705032309.24933-1-libang.li@antgroup.com
Signed-off-by: Bang Li <libang.li@antgroup.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Bang Li 2024-07-05 11:23:09 +08:00 committed by Andrew Morton
parent 4c8763e84a
commit 26c7d8413a
3 changed files with 19 additions and 12 deletions
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9
include/linux/shmem_fs.h
View File

@ -113,12 +113,21 @@ int shmem_unuse(unsigned int type);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
struct mm_struct *mm, unsigned long vm_flags);
unsigned long shmem_allowable_huge_orders(struct inode *inode,
struct vm_area_struct *vma, pgoff_t index,
bool global_huge);
#else
static __always_inline bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
struct mm_struct *mm, unsigned long vm_flags)
{
return false;
}
static inline unsigned long shmem_allowable_huge_orders(struct inode *inode,
struct vm_area_struct *vma, pgoff_t index,
bool global_huge)
{
return 0;
}
#endif
#ifdef CONFIG_SHMEM

13
mm/huge_memory.c
View File

@ -151,10 +151,15 @@ unsigned long __thp_vma_allowable_orders(struct vm_area_struct *vma,
* Must be done before hugepage flags check since shmem has its
* own flags.
*/
if (!in_pf && shmem_file(vma->vm_file))
return shmem_is_huge(file_inode(vma->vm_file), vma->vm_pgoff,
!enforce_sysfs, vma->vm_mm, vm_flags)
? orders : 0;
if (!in_pf && shmem_file(vma->vm_file)) {
bool global_huge = shmem_is_huge(file_inode(vma->vm_file), vma->vm_pgoff,
!enforce_sysfs, vma->vm_mm, vm_flags);
if (!vma_is_anon_shmem(vma))
return global_huge ? orders : 0;
return shmem_allowable_huge_orders(file_inode(vma->vm_file),
vma, vma->vm_pgoff, global_huge);
}
if (!vma_is_anonymous(vma)) {
/*

9
mm/shmem.c
View File

@ -1622,7 +1622,7 @@ static gfp_t limit_gfp_mask(gfp_t huge_gfp, gfp_t limit_gfp)
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static unsigned long shmem_allowable_huge_orders(struct inode *inode,
unsigned long shmem_allowable_huge_orders(struct inode *inode,
struct vm_area_struct *vma, pgoff_t index,
bool global_huge)
{
@ -1707,13 +1707,6 @@ static unsigned long shmem_suitable_orders(struct inode *inode, struct vm_fault
return orders;
}
#else
static unsigned long shmem_allowable_huge_orders(struct inode *inode,
struct vm_area_struct *vma, pgoff_t index,
bool global_huge)
{
return 0;
}
static unsigned long shmem_suitable_orders(struct inode *inode, struct vm_fault *vmf,
struct address_space *mapping, pgoff_t index,
unsigned long orders)