The patch titled
Subject: mm: khugepaged: move some khugepaged_* functions to khugepaged.c
has been added to the -mm tree. Its filename is
mm-khugepaged-move-some-khugepaged_-functions-to-khugepagedc.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-khugepaged-move-some-khugepaged_-functions-to-khugepagedc.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-khugepaged-move-some-khugepaged_-functions-to-khugepagedc.patch
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------------------------------------------------------
From: Yang Shi <shy828301@xxxxxxxxx>
Subject: mm: khugepaged: move some khugepaged_* functions to khugepaged.c
To reuse hugepage_vma_check() for khugepaged_enter() so that we could
remove some duplicate code. But moving hugepage_vma_check() to
khugepaged.h needs to include huge_mm.h in it, it seems not optimal to
bloat khugepaged.h.
And the khugepaged_* functions actually are wrappers for some non-inline
functions, so it seems the benefits are not too much to keep them inline.
So move the khugepaged_* functions to khugepaged.c, any callers just need
to include khugepaged.h which is quite small. For example, the following
patches will call khugepaged_enter() in filemap page fault path for
regular filesystems to make readonly FS THP collapse more consistent. The
filemap.c just needs to include khugepaged.h.
Link: https://lkml.kernel.org/r/20220404200250.321455-7-shy828301@xxxxxxxxx
Signed-off-by: Yang Shi <shy828301@xxxxxxxxx>
Acked-by: Song Liu <song@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/khugepaged.h | 37 +++++------------------------------
mm/khugepaged.c | 20 ++++++++++++++++++
2 files changed, 26 insertions(+), 31 deletions(-)
--- a/include/linux/khugepaged.h~mm-khugepaged-move-some-khugepaged_-functions-to-khugepagedc
+++ a/include/linux/khugepaged.h
@@ -2,10 +2,6 @@
#ifndef _LINUX_KHUGEPAGED_H
#define _LINUX_KHUGEPAGED_H
-#include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
-#include <linux/shmem_fs.h>
-
-
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern struct attribute_group khugepaged_attr_group;
@@ -16,6 +12,12 @@ extern void __khugepaged_enter(struct mm
extern void __khugepaged_exit(struct mm_struct *mm);
extern void khugepaged_enter_vma_merge(struct vm_area_struct *vma,
unsigned long vm_flags);
+extern void khugepaged_fork(struct mm_struct *mm,
+ struct mm_struct *oldmm);
+extern void khugepaged_exit(struct mm_struct *mm);
+extern void khugepaged_enter(struct vm_area_struct *vma,
+ unsigned long vm_flags);
+
extern void khugepaged_min_free_kbytes_update(void);
#ifdef CONFIG_SHMEM
extern void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
@@ -33,36 +35,9 @@ static inline void collapse_pte_mapped_t
#define khugepaged_always() \
(transparent_hugepage_flags & \
(1<<TRANSPARENT_HUGEPAGE_FLAG))
-#define khugepaged_req_madv() \
- (transparent_hugepage_flags & \
- (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
#define khugepaged_defrag() \
(transparent_hugepage_flags & \
(1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
-
-static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
-{
- if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
- __khugepaged_enter(mm);
-}
-
-static inline void khugepaged_exit(struct mm_struct *mm)
-{
- if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
- __khugepaged_exit(mm);
-}
-
-static inline void khugepaged_enter(struct vm_area_struct *vma,
- unsigned long vm_flags)
-{
- if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
- if ((khugepaged_always() ||
- (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) ||
- (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
- !(vm_flags & VM_NOHUGEPAGE) &&
- !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
- __khugepaged_enter(vma->vm_mm);
-}
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
{
--- a/mm/khugepaged.c~mm-khugepaged-move-some-khugepaged_-functions-to-khugepagedc
+++ a/mm/khugepaged.c
@@ -556,6 +556,26 @@ void __khugepaged_exit(struct mm_struct
}
}
+void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
+{
+ if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
+ __khugepaged_enter(mm);
+}
+
+void khugepaged_exit(struct mm_struct *mm)
+{
+ if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
+ __khugepaged_exit(mm);
+}
+
+void khugepaged_enter(struct vm_area_struct *vma, unsigned long vm_flags)
+{
+ if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags) &&
+ khugepaged_enabled())
+ if (hugepage_vma_check(vma, vm_flags))
+ __khugepaged_enter(vma->vm_mm);
+}
+
static void release_pte_page(struct page *page)
{
mod_node_page_state(page_pgdat(page),
_
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-move-some-khugepaged_-functions-to-khugepagedc.patch
mm-khugepaged-introduce-khugepaged_enter_vma-helper.patch
mm-mmap-register-suitable-readonly-file-vmas-for-khugepaged.patch
