The patch titled
Subject: mm: thp: only regular file could be THP eligible
has been added to the -mm mm-unstable branch. Its filename is
mm-thp-only-regular-file-could-be-thp-eligible.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-thp-only-regular-file-could-be-thp-eligible.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Yang Shi <shy828301@xxxxxxxxx>
Subject: mm: thp: only regular file could be THP eligible
Since commit a4aeaa06d45e ("mm: khugepaged: skip huge page collapse for
special files"), khugepaged just collapses THP for regular file which is
the intended usecase for readonly fs THP. Only show regular file as THP
eligible accordingly.
And make file_thp_enabled() available for khugepaged too in order to
remove duplicate code.
Link: https://lkml.kernel.org/r/20220510203222.24246-5-shy828301@xxxxxxxxx
Signed-off-by: Yang Shi <shy828301@xxxxxxxxx>
Acked-by: Song Liu <song@xxxxxxxxxx>
Acked-by: Vlastmil Babka <vbabka@xxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Song Liu <songliubraving@xxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/huge_mm.h | 14 ++++++++++++++
mm/huge_memory.c | 11 ++---------
mm/khugepaged.c | 9 ++-------
3 files changed, 18 insertions(+), 16 deletions(-)
--- a/include/linux/huge_mm.h~mm-thp-only-regular-file-could-be-thp-eligible
+++ a/include/linux/huge_mm.h
@@ -173,6 +173,20 @@ static inline bool __transparent_hugepag
return false;
}
+static inline bool file_thp_enabled(struct vm_area_struct *vma)
+{
+ struct inode *inode;
+
+ if (!vma->vm_file)
+ return false;
+
+ inode = vma->vm_file->f_inode;
+
+ return (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) &&
+ (vma->vm_flags & VM_EXEC) &&
+ !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode);
+}
+
bool transparent_hugepage_active(struct vm_area_struct *vma);
#define transparent_hugepage_use_zero_page() \
--- a/mm/huge_memory.c~mm-thp-only-regular-file-could-be-thp-eligible
+++ a/mm/huge_memory.c
@@ -69,13 +69,6 @@ static atomic_t huge_zero_refcount;
struct page *huge_zero_page __read_mostly;
unsigned long huge_zero_pfn __read_mostly = ~0UL;
-static inline bool file_thp_enabled(struct vm_area_struct *vma)
-{
- return transhuge_vma_enabled(vma, vma->vm_flags) && vma->vm_file &&
- !inode_is_open_for_write(vma->vm_file->f_inode) &&
- (vma->vm_flags & VM_EXEC);
-}
-
bool transparent_hugepage_active(struct vm_area_struct *vma)
{
/* The addr is used to check if the vma size fits */
@@ -87,8 +80,8 @@ bool transparent_hugepage_active(struct
return __transparent_hugepage_enabled(vma);
if (vma_is_shmem(vma))
return shmem_huge_enabled(vma);
- if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS))
- return file_thp_enabled(vma);
+ if (transhuge_vma_enabled(vma, vma->vm_flags) && file_thp_enabled(vma))
+ return true;
return false;
}
--- a/mm/khugepaged.c~mm-thp-only-regular-file-could-be-thp-eligible
+++ a/mm/khugepaged.c
@@ -464,13 +464,8 @@ static bool hugepage_vma_check(struct vm
return false;
/* Only regular file is valid */
- if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && vma->vm_file &&
- (vm_flags & VM_EXEC)) {
- struct inode *inode = vma->vm_file->f_inode;
-
- return !inode_is_open_for_write(inode) &&
- S_ISREG(inode->i_mode);
- }
+ if (file_thp_enabled(vma))
+ return true;
if (!vma->anon_vma || !vma_is_anonymous(vma))
return false;
_
Patches currently in -mm which might be from shy828301@xxxxxxxxx are
sched-coredumph-clarify-the-use-of-mmf_vm_hugepage.patch
mm-khugepaged-remove-redundant-check-for-vm_no_khugepaged.patch
mm-khugepaged-skip-dax-vma.patch
mm-thp-only-regular-file-could-be-thp-eligible.patch
mm-khugepaged-make-khugepaged_enter-void-function.patch
mm-khugepaged-make-hugepage_vma_check-non-static.patch
mm-khugepaged-introduce-khugepaged_enter_vma-helper.patch
mm-mmap-register-suitable-readonly-file-vmas-for-khugepaged.patch
