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Date: Mon, 9 May 2022 16:00:54 -0700
From: Yang Shi <shy828301@...il.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Miaohe Lin <linmiaohe@...wei.com>,
Song Liu <songliubraving@...com>,
Rik van Riel <riel@...riel.com>,
Matthew Wilcox <willy@...radead.org>, Zi Yan <ziy@...dia.com>,
"Theodore Ts'o" <tytso@....edu>,
Andrew Morton <akpm@...ux-foundation.org>,
Linux MM <linux-mm@...ck.org>,
Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [v3 PATCH 6/8] mm: khugepaged: move some khugepaged_* functions
to khugepaged.c
On Mon, May 9, 2022 at 8:31 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>
> On 4/4/22 22:02, Yang Shi wrote:
> > 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.
>
> This last part is inaccurate in v3?
Yeah, thanks for catching this. Since the patch will be reworked, so
the commit log will be reworked as well.
>
> > Acked-by: Song Liu <song@...nel.org>
> > Signed-off-by: Yang Shi <shy828301@...il.com>
>
> I think moving the tiny wrappers is unnecessary.
>
> How about just making hugepage_vma_check() not static and declare it in
> khugepaged.h, then it can be used from khugepaged_enter() in the same file
> and AFAICS no need to include huge_mm.h there?
Sounds good to me, will fix it in v4. Thanks for reviewing and acking
the series.
>
> > ---
> > include/linux/khugepaged.h | 37 ++++++-------------------------------
> > mm/khugepaged.c | 20 ++++++++++++++++++++
> > 2 files changed, 26 insertions(+), 31 deletions(-)
> >
> > diff --git a/include/linux/khugepaged.h b/include/linux/khugepaged.h
> > index 0423d3619f26..6acf9701151e 100644
> > --- a/include/linux/khugepaged.h
> > +++ b/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_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_thp(struct mm_struct *mm,
> > #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)
> > {
> > diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> > index b69eda934d70..ec5b0a691d87 100644
> > --- a/mm/khugepaged.c
> > +++ b/mm/khugepaged.c
> > @@ -556,6 +556,26 @@ void __khugepaged_exit(struct mm_struct *mm)
> > }
> > }
> >
> > +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),
>
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