* [PATCH] mm: khugepaged: skip huge page collapse for special files
@ 2021-10-27 19:52 Yang Shi
2021-10-27 20:34 ` Song Liu
2021-10-27 20:50 ` Matthew Wilcox
0 siblings, 2 replies; 8+ messages in thread
From: Yang Shi @ 2021-10-27 19:52 UTC (permalink / raw)
To: hughd, sunhao.th, willy, kirill.shutemov, songliubraving,
andrea.righi, akpm
Cc: shy828301, linux-mm, linux-kernel, stable
The read-only THP for filesystems would collapse THP for file opened
readonly and mapped with VM_EXEC, the intended usecase is to avoid TLB
miss for large text segment. But it doesn't restrict the file types so
THP could be collapsed for non-regular file, for example, block device,
if it is opened readonly and mapped with EXEC permission. This may
cause bugs, like [1] and [2].
This is definitely not intended usecase, so just collapsing THP for regular
file in order to close the attack surface.
[1] https://lore.kernel.org/lkml/CACkBjsYwLYLRmX8GpsDpMthagWOjWWrNxqY6ZLNQVr6yx+f5vA@mail.gmail.com/
[2] https://lore.kernel.org/linux-mm/000000000000c6a82505ce284e4c@google.com/
Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS")
Reported-by: Hao Sun <sunhao.th@gmail.com>
Reported-by: syzbot+aae069be1de40fb11825@syzkaller.appspotmail.com
Cc: Hao Sun <sunhao.th@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Andrea Righi <andrea.righi@canonical.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Yang Shi <shy828301@gmail.com>
---
The patch is basically based off the proposal from Hugh
(https://lore.kernel.org/linux-mm/a07564a3-b2fc-9ffe-3ace-3f276075ea5c@google.com/).
It seems Hugh is too busy to prepare the patch for formal submission (I
didn't hear from him by pinging him a couple of times on mailing list),
so I prepared the patch and added his SOB.
mm/khugepaged.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 045cc579f724..e91b7271275e 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -445,22 +445,25 @@ static bool hugepage_vma_check(struct vm_area_struct *vma,
if (!transhuge_vma_enabled(vma, vm_flags))
return false;
- /* Enabled via shmem mount options or sysfs settings. */
- if (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) {
+ if (vma->vm_file)
return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
HPAGE_PMD_NR);
- }
+
+ /* Enabled via shmem mount options or sysfs settings. */
+ if (shmem_file(vma->vm_file))
+ return shmem_huge_enabled(vma);
/* THP settings require madvise. */
if (!(vm_flags & VM_HUGEPAGE) && !khugepaged_always())
return false;
- /* Read-only file mappings need to be aligned for THP to work. */
+ /* Only regular file is valid */
if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && vma->vm_file &&
- !inode_is_open_for_write(vma->vm_file->f_inode) &&
(vm_flags & VM_EXEC)) {
- return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
- HPAGE_PMD_NR);
+ struct inode *inode = vma->vm_file->f_inode;
+
+ return !inode_is_open_for_write(inode) &&
+ S_ISREG(inode->i_mode);
}
if (!vma->anon_vma || vma->vm_ops)
--
2.26.2
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH] mm: khugepaged: skip huge page collapse for special files
2021-10-27 19:52 [PATCH] mm: khugepaged: skip huge page collapse for special files Yang Shi
@ 2021-10-27 20:34 ` Song Liu
2021-10-27 20:44 ` Yang Shi
2021-10-27 20:50 ` Matthew Wilcox
1 sibling, 1 reply; 8+ messages in thread
From: Song Liu @ 2021-10-27 20:34 UTC (permalink / raw)
To: Yang Shi
Cc: Hugh Dickins, sunhao.th, Matthew Wilcox, Kirill A. Shutemov,
andrea.righi, Andrew Morton, Linux Memory Management List,
linux-kernel, stable
> On Oct 27, 2021, at 12:52 PM, Yang Shi <shy828301@gmail.com> wrote:
>
> The read-only THP for filesystems would collapse THP for file opened
> readonly and mapped with VM_EXEC, the intended usecase is to avoid TLB
> miss for large text segment. But it doesn't restrict the file types so
> THP could be collapsed for non-regular file, for example, block device,
> if it is opened readonly and mapped with EXEC permission. This may
> cause bugs, like [1] and [2].
>
> This is definitely not intended usecase, so just collapsing THP for regular
> file in order to close the attack surface.
>
> [1] https://lore.kernel.org/lkml/CACkBjsYwLYLRmX8GpsDpMthagWOjWWrNxqY6ZLNQVr6yx+f5vA@mail.gmail.com/
> [2] https://lore.kernel.org/linux-mm/000000000000c6a82505ce284e4c@google.com/
>
> Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS")
> Reported-by: Hao Sun <sunhao.th@gmail.com>
> Reported-by: syzbot+aae069be1de40fb11825@syzkaller.appspotmail.com
> Cc: Hao Sun <sunhao.th@gmail.com>
> Cc: Matthew Wilcox <willy@infradead.org>
> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: Song Liu <songliubraving@fb.com>
> Cc: Andrea Righi <andrea.righi@canonical.com>
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Hugh Dickins <hughd@google.com>
> Signed-off-by: Yang Shi <shy828301@gmail.com>
> ---
> The patch is basically based off the proposal from Hugh
> (https://lore.kernel.org/linux-mm/a07564a3-b2fc-9ffe-3ace-3f276075ea5c@google.com/).
> It seems Hugh is too busy to prepare the patch for formal submission (I
> didn't hear from him by pinging him a couple of times on mailing list),
> so I prepared the patch and added his SOB.
>
> mm/khugepaged.c | 17 ++++++++++-------
> 1 file changed, 10 insertions(+), 7 deletions(-)
>
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index 045cc579f724..e91b7271275e 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -445,22 +445,25 @@ static bool hugepage_vma_check(struct vm_area_struct *vma,
> if (!transhuge_vma_enabled(vma, vm_flags))
> return false;
>
> - /* Enabled via shmem mount options or sysfs settings. */
> - if (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) {
> + if (vma->vm_file)
> return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> HPAGE_PMD_NR);
Am I misreading this? If we return here for vma->vm_file, the following
logic (shmem_file(), etc.) would be skipped, no?
Thanks,
Song
> - }
> +
> + /* Enabled via shmem mount options or sysfs settings. */
> + if (shmem_file(vma->vm_file))
> + return shmem_huge_enabled(vma);
>
> /* THP settings require madvise. */
> if (!(vm_flags & VM_HUGEPAGE) && !khugepaged_always())
> return false;
>
> - /* Read-only file mappings need to be aligned for THP to work. */
> + /* Only regular file is valid */
> if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && vma->vm_file &&
> - !inode_is_open_for_write(vma->vm_file->f_inode) &&
> (vm_flags & VM_EXEC)) {
> - return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> - HPAGE_PMD_NR);
> + struct inode *inode = vma->vm_file->f_inode;
> +
> + return !inode_is_open_for_write(inode) &&
> + S_ISREG(inode->i_mode);
> }
>
> if (!vma->anon_vma || vma->vm_ops)
> --
> 2.26.2
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] mm: khugepaged: skip huge page collapse for special files
2021-10-27 20:34 ` Song Liu
@ 2021-10-27 20:44 ` Yang Shi
2021-10-27 20:53 ` Andrew Morton
0 siblings, 1 reply; 8+ messages in thread
From: Yang Shi @ 2021-10-27 20:44 UTC (permalink / raw)
To: Song Liu
Cc: Hugh Dickins, sunhao.th, Matthew Wilcox, Kirill A. Shutemov,
andrea.righi, Andrew Morton, Linux Memory Management List,
linux-kernel, stable
On Wed, Oct 27, 2021 at 1:35 PM Song Liu <songliubraving@fb.com> wrote:
>
>
>
> > On Oct 27, 2021, at 12:52 PM, Yang Shi <shy828301@gmail.com> wrote:
> >
> > The read-only THP for filesystems would collapse THP for file opened
> > readonly and mapped with VM_EXEC, the intended usecase is to avoid TLB
> > miss for large text segment. But it doesn't restrict the file types so
> > THP could be collapsed for non-regular file, for example, block device,
> > if it is opened readonly and mapped with EXEC permission. This may
> > cause bugs, like [1] and [2].
> >
> > This is definitely not intended usecase, so just collapsing THP for regular
> > file in order to close the attack surface.
> >
> > [1] https://lore.kernel.org/lkml/CACkBjsYwLYLRmX8GpsDpMthagWOjWWrNxqY6ZLNQVr6yx+f5vA@mail.gmail.com/
> > [2] https://lore.kernel.org/linux-mm/000000000000c6a82505ce284e4c@google.com/
> >
> > Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS")
> > Reported-by: Hao Sun <sunhao.th@gmail.com>
> > Reported-by: syzbot+aae069be1de40fb11825@syzkaller.appspotmail.com
> > Cc: Hao Sun <sunhao.th@gmail.com>
> > Cc: Matthew Wilcox <willy@infradead.org>
> > Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> > Cc: Song Liu <songliubraving@fb.com>
> > Cc: Andrea Righi <andrea.righi@canonical.com>
> > Cc: <stable@vger.kernel.org>
> > Signed-off-by: Hugh Dickins <hughd@google.com>
> > Signed-off-by: Yang Shi <shy828301@gmail.com>
> > ---
> > The patch is basically based off the proposal from Hugh
> > (https://lore.kernel.org/linux-mm/a07564a3-b2fc-9ffe-3ace-3f276075ea5c@google.com/).
> > It seems Hugh is too busy to prepare the patch for formal submission (I
> > didn't hear from him by pinging him a couple of times on mailing list),
> > so I prepared the patch and added his SOB.
> >
> > mm/khugepaged.c | 17 ++++++++++-------
> > 1 file changed, 10 insertions(+), 7 deletions(-)
> >
> > diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> > index 045cc579f724..e91b7271275e 100644
> > --- a/mm/khugepaged.c
> > +++ b/mm/khugepaged.c
> > @@ -445,22 +445,25 @@ static bool hugepage_vma_check(struct vm_area_struct *vma,
> > if (!transhuge_vma_enabled(vma, vm_flags))
> > return false;
> >
> > - /* Enabled via shmem mount options or sysfs settings. */
> > - if (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) {
> > + if (vma->vm_file)
> > return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> > HPAGE_PMD_NR);
>
> Am I misreading this? If we return here for vma->vm_file, the following
> logic (shmem_file(), etc.) would be skipped, no?
Oh, yes, you are right. My mistake.
Andrew,
Could you please apply the below fix?
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index e91b7271275e..26f1798c88d2 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -445,9 +445,9 @@ static bool hugepage_vma_check(struct vm_area_struct *vma,
if (!transhuge_vma_enabled(vma, vm_flags))
return false;
- if (vma->vm_file)
- return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
- HPAGE_PMD_NR);
+ if (vma->vm_file && !IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) -
+ vma->vm_pgoff, HPAGE_PMD_NR))
+ return false;
/* Enabled via shmem mount options or sysfs settings. */
if (shmem_file(vma->vm_file))
>
> Thanks,
> Song
>
> > - }
> > +
> > + /* Enabled via shmem mount options or sysfs settings. */
> > + if (shmem_file(vma->vm_file))
> > + return shmem_huge_enabled(vma);
> >
> > /* THP settings require madvise. */
> > if (!(vm_flags & VM_HUGEPAGE) && !khugepaged_always())
> > return false;
> >
> > - /* Read-only file mappings need to be aligned for THP to work. */
> > + /* Only regular file is valid */
> > if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && vma->vm_file &&
> > - !inode_is_open_for_write(vma->vm_file->f_inode) &&
> > (vm_flags & VM_EXEC)) {
> > - return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> > - HPAGE_PMD_NR);
> > + struct inode *inode = vma->vm_file->f_inode;
> > +
> > + return !inode_is_open_for_write(inode) &&
> > + S_ISREG(inode->i_mode);
> > }
> >
> > if (!vma->anon_vma || vma->vm_ops)
> > --
> > 2.26.2
> >
>
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH] mm: khugepaged: skip huge page collapse for special files
2021-10-27 19:52 [PATCH] mm: khugepaged: skip huge page collapse for special files Yang Shi
2021-10-27 20:34 ` Song Liu
@ 2021-10-27 20:50 ` Matthew Wilcox
2021-10-27 21:32 ` Yang Shi
1 sibling, 1 reply; 8+ messages in thread
From: Matthew Wilcox @ 2021-10-27 20:50 UTC (permalink / raw)
To: Yang Shi
Cc: hughd, sunhao.th, kirill.shutemov, songliubraving, andrea.righi,
akpm, linux-mm, linux-kernel, stable
On Wed, Oct 27, 2021 at 12:52:21PM -0700, Yang Shi wrote:
> +++ b/mm/khugepaged.c
> @@ -445,22 +445,25 @@ static bool hugepage_vma_check(struct vm_area_struct *vma,
> if (!transhuge_vma_enabled(vma, vm_flags))
> return false;
>
> - /* Enabled via shmem mount options or sysfs settings. */
> - if (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) {
> + if (vma->vm_file)
> return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> HPAGE_PMD_NR);
> - }
> +
> + /* Enabled via shmem mount options or sysfs settings. */
> + if (shmem_file(vma->vm_file))
> + return shmem_huge_enabled(vma);
This doesn't make sense to me. if vma->vm_file, we already returned,
so this is dead code.
> /* THP settings require madvise. */
> if (!(vm_flags & VM_HUGEPAGE) && !khugepaged_always())
> return false;
>
> - /* Read-only file mappings need to be aligned for THP to work. */
> + /* Only regular file is valid */
> if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && vma->vm_file &&
> - !inode_is_open_for_write(vma->vm_file->f_inode) &&
> (vm_flags & VM_EXEC)) {
> - return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> - HPAGE_PMD_NR);
> + struct inode *inode = vma->vm_file->f_inode;
> +
> + return !inode_is_open_for_write(inode) &&
> + S_ISREG(inode->i_mode);
> }
>
> if (!vma->anon_vma || vma->vm_ops)
> --
> 2.26.2
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] mm: khugepaged: skip huge page collapse for special files
2021-10-27 20:44 ` Yang Shi
@ 2021-10-27 20:53 ` Andrew Morton
2021-10-27 21:57 ` Yang Shi
0 siblings, 1 reply; 8+ messages in thread
From: Andrew Morton @ 2021-10-27 20:53 UTC (permalink / raw)
To: Yang Shi
Cc: Song Liu, Hugh Dickins, sunhao.th, Matthew Wilcox,
Kirill A. Shutemov, andrea.righi, Linux Memory Management List,
linux-kernel, stable
On Wed, 27 Oct 2021 13:44:37 -0700 Yang Shi <shy828301@gmail.com> wrote:
> > > --- a/mm/khugepaged.c
> > > +++ b/mm/khugepaged.c
> > > @@ -445,22 +445,25 @@ static bool hugepage_vma_check(struct vm_area_struct *vma,
> > > if (!transhuge_vma_enabled(vma, vm_flags))
> > > return false;
> > >
> > > - /* Enabled via shmem mount options or sysfs settings. */
> > > - if (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) {
> > > + if (vma->vm_file)
> > > return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> > > HPAGE_PMD_NR);
> >
> > Am I misreading this? If we return here for vma->vm_file, the following
> > logic (shmem_file(), etc.) would be skipped, no?
>
> Oh, yes, you are right. My mistake.
>
> Andrew,
>
> Could you please apply the below fix?
um, how well tested are these changes?
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] mm: khugepaged: skip huge page collapse for special files
2021-10-27 20:50 ` Matthew Wilcox
@ 2021-10-27 21:32 ` Yang Shi
2021-10-27 21:37 ` Matthew Wilcox
0 siblings, 1 reply; 8+ messages in thread
From: Yang Shi @ 2021-10-27 21:32 UTC (permalink / raw)
To: Matthew Wilcox
Cc: Hugh Dickins, Hao Sun, Kirill A. Shutemov, Song Liu,
Andrea Righi, Andrew Morton, Linux MM, Linux Kernel Mailing List,
stable
On Wed, Oct 27, 2021 at 1:50 PM Matthew Wilcox <willy@infradead.org> wrote:
>
> On Wed, Oct 27, 2021 at 12:52:21PM -0700, Yang Shi wrote:
> > +++ b/mm/khugepaged.c
> > @@ -445,22 +445,25 @@ static bool hugepage_vma_check(struct vm_area_struct *vma,
> > if (!transhuge_vma_enabled(vma, vm_flags))
> > return false;
> >
> > - /* Enabled via shmem mount options or sysfs settings. */
> > - if (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) {
> > + if (vma->vm_file)
> > return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> > HPAGE_PMD_NR);
> > - }
> > +
> > + /* Enabled via shmem mount options or sysfs settings. */
> > + if (shmem_file(vma->vm_file))
> > + return shmem_huge_enabled(vma);
>
> This doesn't make sense to me. if vma->vm_file, we already returned,
> so this is dead code.
Yes, Song mentioned the same thing. Fixed by an incremental patch.
>
> > /* THP settings require madvise. */
> > if (!(vm_flags & VM_HUGEPAGE) && !khugepaged_always())
> > return false;
> >
> > - /* Read-only file mappings need to be aligned for THP to work. */
> > + /* Only regular file is valid */
> > if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && vma->vm_file &&
> > - !inode_is_open_for_write(vma->vm_file->f_inode) &&
> > (vm_flags & VM_EXEC)) {
> > - return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> > - HPAGE_PMD_NR);
> > + struct inode *inode = vma->vm_file->f_inode;
> > +
> > + return !inode_is_open_for_write(inode) &&
> > + S_ISREG(inode->i_mode);
> > }
> >
> > if (!vma->anon_vma || vma->vm_ops)
> > --
> > 2.26.2
> >
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] mm: khugepaged: skip huge page collapse for special files
2021-10-27 21:32 ` Yang Shi
@ 2021-10-27 21:37 ` Matthew Wilcox
0 siblings, 0 replies; 8+ messages in thread
From: Matthew Wilcox @ 2021-10-27 21:37 UTC (permalink / raw)
To: Yang Shi
Cc: Hugh Dickins, Hao Sun, Kirill A. Shutemov, Song Liu,
Andrea Righi, Andrew Morton, Linux MM, Linux Kernel Mailing List,
stable
On Wed, Oct 27, 2021 at 02:32:02PM -0700, Yang Shi wrote:
> > This doesn't make sense to me. if vma->vm_file, we already returned,
> > so this is dead code.
>
> Yes, Song mentioned the same thing. Fixed by an incremental patch.
I saw that after I sent this. My email sometimes arrives slowly.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] mm: khugepaged: skip huge page collapse for special files
2021-10-27 20:53 ` Andrew Morton
@ 2021-10-27 21:57 ` Yang Shi
0 siblings, 0 replies; 8+ messages in thread
From: Yang Shi @ 2021-10-27 21:57 UTC (permalink / raw)
To: Andrew Morton
Cc: Song Liu, Hugh Dickins, sunhao.th, Matthew Wilcox,
Kirill A. Shutemov, andrea.righi, Linux Memory Management List,
linux-kernel, stable
On Wed, Oct 27, 2021 at 1:53 PM Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Wed, 27 Oct 2021 13:44:37 -0700 Yang Shi <shy828301@gmail.com> wrote:
>
> > > > --- a/mm/khugepaged.c
> > > > +++ b/mm/khugepaged.c
> > > > @@ -445,22 +445,25 @@ static bool hugepage_vma_check(struct vm_area_struct *vma,
> > > > if (!transhuge_vma_enabled(vma, vm_flags))
> > > > return false;
> > > >
> > > > - /* Enabled via shmem mount options or sysfs settings. */
> > > > - if (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) {
> > > > + if (vma->vm_file)
> > > > return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
> > > > HPAGE_PMD_NR);
> > >
> > > Am I misreading this? If we return here for vma->vm_file, the following
> > > logic (shmem_file(), etc.) would be skipped, no?
> >
> > Oh, yes, you are right. My mistake.
> >
> > Andrew,
> >
> > Could you please apply the below fix?
>
> um, how well tested are these changes?
I has this fix on my test machine, but somehow forgot to fold it into
the original patch. The whole fix was tested by opening /dev/nullb0
readonly and mapping with PROT_EXEC, the THP was not collapsed
anymore.
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2021-10-27 21:57 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
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2021-10-27 19:52 [PATCH] mm: khugepaged: skip huge page collapse for special files Yang Shi
2021-10-27 20:34 ` Song Liu
2021-10-27 20:44 ` Yang Shi
2021-10-27 20:53 ` Andrew Morton
2021-10-27 21:57 ` Yang Shi
2021-10-27 20:50 ` Matthew Wilcox
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