* [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink()
@ 2018-03-16 10:59 Kirill A. Shutemov
2018-03-16 12:13 ` Michal Hocko
0 siblings, 1 reply; 9+ messages in thread
From: Kirill A. Shutemov @ 2018-03-16 10:59 UTC (permalink / raw)
To: Andrew Morton
Cc: Michal Hocko, linux-mm, linux-kernel, Kirill A. Shutemov, stable
shmem_unused_huge_shrink() gets called from reclaim path. Waiting for page
lock may lead to deadlock there.
Replace lock_page() with trylock_page() and skip the page if we failed
to lock it. We will get to the page on the next scan.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Fixes: 779750d20b93 ("shmem: split huge pages beyond i_size under memory pressure")
Cc: stable@vger.kernel.org # v4.8+
---
mm/shmem.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)
diff --git a/mm/shmem.c b/mm/shmem.c
index 1907688b75ee..2afe809d4bd4 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -498,31 +498,42 @@ static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
continue;
}
- page = find_lock_page(inode->i_mapping,
+ page = find_get_page(inode->i_mapping,
(inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT);
if (!page)
goto drop;
+ /* No huge page at the end of the file: nothing to split */
if (!PageTransHuge(page)) {
- unlock_page(page);
put_page(page);
goto drop;
}
+ /*
+ * Leave the inode on the list if we failed to lock
+ * the page at this time.
+ *
+ * Waiting for the lock may lead to deadlock in the
+ * reclaim path.
+ */
+ if (!trylock_page(page)) {
+ put_page(page);
+ goto leave;
+ }
+
ret = split_huge_page(page);
unlock_page(page);
put_page(page);
- if (ret) {
- /* split failed: leave it on the list */
- iput(inode);
- continue;
- }
+ /* If split failed leave the inode on the list */
+ if (ret)
+ goto leave;
split++;
drop:
list_del_init(&info->shrinklist);
removed++;
+leave:
iput(inode);
}
--
2.16.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink()
2018-03-16 10:59 [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink() Kirill A. Shutemov
@ 2018-03-16 12:13 ` Michal Hocko
2018-03-16 12:25 ` Kirill A. Shutemov
0 siblings, 1 reply; 9+ messages in thread
From: Michal Hocko @ 2018-03-16 12:13 UTC (permalink / raw)
To: Kirill A. Shutemov; +Cc: Andrew Morton, linux-mm, linux-kernel, stable
On Fri 16-03-18 13:59:08, Kirill A. Shutemov wrote:
[..]
> @@ -498,31 +498,42 @@ static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
> continue;
> }
>
> - page = find_lock_page(inode->i_mapping,
> + page = find_get_page(inode->i_mapping,
> (inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT);
> if (!page)
> goto drop;
>
> + /* No huge page at the end of the file: nothing to split */
> if (!PageTransHuge(page)) {
> - unlock_page(page);
> put_page(page);
> goto drop;
> }
>
> + /*
> + * Leave the inode on the list if we failed to lock
> + * the page at this time.
> + *
> + * Waiting for the lock may lead to deadlock in the
> + * reclaim path.
> + */
> + if (!trylock_page(page)) {
> + put_page(page);
> + goto leave;
> + }
Can somebody split the huge page after the PageTransHuge check and
before we lock it?
> +
> ret = split_huge_page(page);
> unlock_page(page);
> put_page(page);
>
> - if (ret) {
> - /* split failed: leave it on the list */
> - iput(inode);
> - continue;
> - }
> + /* If split failed leave the inode on the list */
> + if (ret)
> + goto leave;
>
> split++;
> drop:
> list_del_init(&info->shrinklist);
> removed++;
> +leave:
> iput(inode);
> }
>
> --
> 2.16.1
--
Michal Hocko
SUSE Labs
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink()
2018-03-16 12:13 ` Michal Hocko
@ 2018-03-16 12:25 ` Kirill A. Shutemov
2018-03-16 12:58 ` Michal Hocko
0 siblings, 1 reply; 9+ messages in thread
From: Kirill A. Shutemov @ 2018-03-16 12:25 UTC (permalink / raw)
To: Michal Hocko
Cc: Kirill A. Shutemov, Andrew Morton, linux-mm, linux-kernel, stable
On Fri, Mar 16, 2018 at 01:13:03PM +0100, Michal Hocko wrote:
> On Fri 16-03-18 13:59:08, Kirill A. Shutemov wrote:
> [..]
> > @@ -498,31 +498,42 @@ static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
> > continue;
> > }
> >
> > - page = find_lock_page(inode->i_mapping,
> > + page = find_get_page(inode->i_mapping,
> > (inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT);
> > if (!page)
> > goto drop;
> >
> > + /* No huge page at the end of the file: nothing to split */
> > if (!PageTransHuge(page)) {
> > - unlock_page(page);
> > put_page(page);
> > goto drop;
> > }
> >
> > + /*
> > + * Leave the inode on the list if we failed to lock
> > + * the page at this time.
> > + *
> > + * Waiting for the lock may lead to deadlock in the
> > + * reclaim path.
> > + */
> > + if (!trylock_page(page)) {
> > + put_page(page);
> > + goto leave;
> > + }
>
> Can somebody split the huge page after the PageTransHuge check and
> before we lock it?
Nope. Pin on the page is enough to prevent split.
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink()
2018-03-16 12:25 ` Kirill A. Shutemov
@ 2018-03-16 12:58 ` Michal Hocko
2018-03-16 13:02 ` Kirill A. Shutemov
0 siblings, 1 reply; 9+ messages in thread
From: Michal Hocko @ 2018-03-16 12:58 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Kirill A. Shutemov, Andrew Morton, linux-mm, linux-kernel,
stable, Eric Wheeler, Tetsuo Handa
On Fri 16-03-18 15:25:08, Kirill A. Shutemov wrote:
> On Fri, Mar 16, 2018 at 01:13:03PM +0100, Michal Hocko wrote:
> > On Fri 16-03-18 13:59:08, Kirill A. Shutemov wrote:
> > [..]
> > > @@ -498,31 +498,42 @@ static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
> > > continue;
> > > }
> > >
> > > - page = find_lock_page(inode->i_mapping,
> > > + page = find_get_page(inode->i_mapping,
> > > (inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT);
> > > if (!page)
> > > goto drop;
> > >
> > > + /* No huge page at the end of the file: nothing to split */
> > > if (!PageTransHuge(page)) {
> > > - unlock_page(page);
> > > put_page(page);
> > > goto drop;
> > > }
> > >
> > > + /*
> > > + * Leave the inode on the list if we failed to lock
> > > + * the page at this time.
> > > + *
> > > + * Waiting for the lock may lead to deadlock in the
> > > + * reclaim path.
> > > + */
> > > + if (!trylock_page(page)) {
> > > + put_page(page);
> > > + goto leave;
> > > + }
> >
> > Can somebody split the huge page after the PageTransHuge check and
> > before we lock it?
>
> Nope. Pin on the page is enough to prevent split.
Good, I thought so but wasn't really 100% sure. Thanks for the
clarification and feel free to add
Acked-by: Michal Hocko <mhocko@suse.com>
Maybe you should stick
Reported-by: Eric Wheeler <linux-mm@lists.ewheeler.net>
and point to http://lkml.kernel.org/r/alpine.LRH.2.11.1801242349220.30642@mail.ewheeler.net
because that smells like a bug that this patch would be fixing.
--
Michal Hocko
SUSE Labs
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink()
2018-03-16 12:58 ` Michal Hocko
@ 2018-03-16 13:02 ` Kirill A. Shutemov
2018-03-16 13:14 ` Tetsuo Handa
0 siblings, 1 reply; 9+ messages in thread
From: Kirill A. Shutemov @ 2018-03-16 13:02 UTC (permalink / raw)
To: Michal Hocko
Cc: Kirill A. Shutemov, Andrew Morton, linux-mm, linux-kernel,
stable, Eric Wheeler, Tetsuo Handa
On Fri, Mar 16, 2018 at 01:58:27PM +0100, Michal Hocko wrote:
> On Fri 16-03-18 15:25:08, Kirill A. Shutemov wrote:
> > On Fri, Mar 16, 2018 at 01:13:03PM +0100, Michal Hocko wrote:
> > > On Fri 16-03-18 13:59:08, Kirill A. Shutemov wrote:
> > > [..]
> > > > @@ -498,31 +498,42 @@ static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
> > > > continue;
> > > > }
> > > >
> > > > - page = find_lock_page(inode->i_mapping,
> > > > + page = find_get_page(inode->i_mapping,
> > > > (inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT);
> > > > if (!page)
> > > > goto drop;
> > > >
> > > > + /* No huge page at the end of the file: nothing to split */
> > > > if (!PageTransHuge(page)) {
> > > > - unlock_page(page);
> > > > put_page(page);
> > > > goto drop;
> > > > }
> > > >
> > > > + /*
> > > > + * Leave the inode on the list if we failed to lock
> > > > + * the page at this time.
> > > > + *
> > > > + * Waiting for the lock may lead to deadlock in the
> > > > + * reclaim path.
> > > > + */
> > > > + if (!trylock_page(page)) {
> > > > + put_page(page);
> > > > + goto leave;
> > > > + }
> > >
> > > Can somebody split the huge page after the PageTransHuge check and
> > > before we lock it?
> >
> > Nope. Pin on the page is enough to prevent split.
>
> Good, I thought so but wasn't really 100% sure. Thanks for the
> clarification and feel free to add
> Acked-by: Michal Hocko <mhocko@suse.com>
Thanks.
> Maybe you should stick
> Reported-by: Eric Wheeler <linux-mm@lists.ewheeler.net>
> and point to http://lkml.kernel.org/r/alpine.LRH.2.11.1801242349220.30642@mail.ewheeler.net
> because that smells like a bug that this patch would be fixing.
Good point.
Andrew, do you want me repost with tags integrated?
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink()
2018-03-16 13:02 ` Kirill A. Shutemov
@ 2018-03-16 13:14 ` Tetsuo Handa
2018-03-16 13:20 ` Michal Hocko
2018-03-16 13:34 ` Kirill A. Shutemov
0 siblings, 2 replies; 9+ messages in thread
From: Tetsuo Handa @ 2018-03-16 13:14 UTC (permalink / raw)
To: kirill, mhocko
Cc: kirill.shutemov, akpm, linux-mm, linux-kernel, stable, linux-mm
f2fs is doing
page = f2fs_pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0);
which calls
struct page *pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0);
. Then, can't we define
static inline struct page *find_trylock_page(struct address_space *mapping,
pgoff_t offset)
{
return pagecache_get_page(mapping, offset, FGP_LOCK|FGP_NOWAIT, 0);
}
and replace find_lock_page() with find_trylock_page() ?
Also, won't
----------
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 34ce3ebf..0cfc329 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -479,6 +479,8 @@ static inline int trylock_page(struct page *page)
static inline void lock_page(struct page *page)
{
might_sleep();
+ WARN_ONCE(current->flags & PF_MEMALLOC,
+ "lock_page() from reclaim context might deadlock");
if (!trylock_page(page))
__lock_page(page);
}
@@ -491,6 +493,8 @@ static inline void lock_page(struct page *page)
static inline int lock_page_killable(struct page *page)
{
might_sleep();
+ WARN_ONCE(current->flags & PF_MEMALLOC,
+ "lock_page_killable() from reclaim context might deadlock");
if (!trylock_page(page))
return __lock_page_killable(page);
return 0;
----------
help find lock_page() users in deep reclaim paths?
----------
[ 100.314083] ------------[ cut here ]------------
[ 100.315695] lock_page() from reclaim context might deadlock
[ 100.315708] WARNING: CPU: 1 PID: 56 at ./include/linux/pagemap.h:483 pagecache_get_page+0x245/0x250
[ 100.319686] Modules linked in: sg pcspkr i2c_piix4 vmw_vmci shpchp sd_mod ata_generic pata_acpi serio_raw vmwgfx drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm ahci mptspi libahci scsi_transport_spi mptscsih ata_piix mptbase i2c_core e1000 libata ipv6
[ 100.325951] CPU: 1 PID: 56 Comm: kswapd0 Kdump: loaded Not tainted 4.16.0-rc5-next-20180315+ #696
[ 100.328439] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/19/2017
[ 100.331625] RIP: 0010:pagecache_get_page+0x245/0x250
[ 100.333211] RSP: 0018:ffffc9000085bc00 EFLAGS: 00010286
[ 100.334832] RAX: 0000000000000000 RBX: ffffea0004ad3100 RCX: 0000000000000007
[ 100.336900] RDX: 0000000000000b63 RSI: ffff88013aa0b700 RDI: ffff88013aa0ae80
[ 100.339068] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
[ 100.341108] R10: 0000000000000040 R11: 0000000000000000 R12: ffff880139b6e0c8
[ 100.343153] R13: 0000000000000000 R14: ffffffff82068220 R15: 0000000000000002
[ 100.345242] FS: 0000000000000000(0000) GS:ffff88013bc40000(0000) knlGS:0000000000000000
[ 100.347510] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 100.349277] CR2: 00007f326c67e000 CR3: 000000000200f006 CR4: 00000000001606e0
[ 100.351343] Call Trace:
[ 100.352374] ? iput+0x52/0x2f0
[ 100.353567] shmem_unused_huge_shrink+0x2e9/0x380
[ 100.355112] super_cache_scan+0x17a/0x180
[ 100.356553] shrink_slab+0x218/0x590
[ 100.357854] shrink_node+0x346/0x350
[ 100.359161] kswapd+0x322/0x930
[ 100.360370] kthread+0xf0/0x130
[ 100.361566] ? mem_cgroup_shrink_node+0x320/0x320
[ 100.363112] ? kthread_create_on_node+0x60/0x60
[ 100.364634] ret_from_fork+0x3a/0x50
[ 100.365943] Code: db e8 70 4c 01 00 e9 5e fe ff ff 80 3d 44 51 f8 00 00 0f 85 46 ff ff ff 48 c7 c7 60 11 df 81 c6 05 30 51 f8 00 01 e8 5b 86 ee ff <0f> 0b e9 2c ff ff ff 0f 1f 40 00 83 e2 02 53 8b 8f 48 01 00 00
[ 100.371197] ---[ end trace b50eee6f891efec3 ]---
----------
^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink()
2018-03-16 13:14 ` Tetsuo Handa
@ 2018-03-16 13:20 ` Michal Hocko
2018-03-16 13:34 ` Kirill A. Shutemov
1 sibling, 0 replies; 9+ messages in thread
From: Michal Hocko @ 2018-03-16 13:20 UTC (permalink / raw)
To: Tetsuo Handa
Cc: kirill, kirill.shutemov, akpm, linux-mm, linux-kernel, stable, linux-mm
On Fri 16-03-18 22:14:24, Tetsuo Handa wrote:
> f2fs is doing
>
> page = f2fs_pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0);
>
> which calls
>
> struct page *pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0);
>
> . Then, can't we define
>
> static inline struct page *find_trylock_page(struct address_space *mapping,
> pgoff_t offset)
> {
> return pagecache_get_page(mapping, offset, FGP_LOCK|FGP_NOWAIT, 0);
> }
>
> and replace find_lock_page() with find_trylock_page() ?
I haven't checked whether we have enough users of this pattern to create
a helper.
> Also, won't
>
> ----------
> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index 34ce3ebf..0cfc329 100644
> --- a/include/linux/pagemap.h
> +++ b/include/linux/pagemap.h
> @@ -479,6 +479,8 @@ static inline int trylock_page(struct page *page)
> static inline void lock_page(struct page *page)
> {
> might_sleep();
> + WARN_ONCE(current->flags & PF_MEMALLOC,
> + "lock_page() from reclaim context might deadlock");
> if (!trylock_page(page))
> __lock_page(page);
> }
lock_page is called from many (semi)hot paths so I wouldn't add
additional code there. Maybe we can hide it in VM_WARN. I would have
to think much more to be sure this won't lead to some strange false
positives. I suspect it won't but wouldn't bet my head on that.
In any case, you can try to send a patch and we can stick it into mmotm
and have it there for few cycles to see what falls out...
--
Michal Hocko
SUSE Labs
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink()
2018-03-16 13:14 ` Tetsuo Handa
2018-03-16 13:20 ` Michal Hocko
@ 2018-03-16 13:34 ` Kirill A. Shutemov
2018-03-16 14:42 ` Tetsuo Handa
1 sibling, 1 reply; 9+ messages in thread
From: Kirill A. Shutemov @ 2018-03-16 13:34 UTC (permalink / raw)
To: Tetsuo Handa
Cc: mhocko, kirill.shutemov, akpm, linux-mm, linux-kernel, stable, linux-mm
On Fri, Mar 16, 2018 at 10:14:24PM +0900, Tetsuo Handa wrote:
> f2fs is doing
>
> page = f2fs_pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0);
>
> which calls
>
> struct page *pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0);
>
> . Then, can't we define
>
> static inline struct page *find_trylock_page(struct address_space *mapping,
> pgoff_t offset)
> {
> return pagecache_get_page(mapping, offset, FGP_LOCK|FGP_NOWAIT, 0);
> }
>
> and replace find_lock_page() with find_trylock_page() ?
This won't work in this case. We need to destinct no-page-in-page-cache
from failed-to-lock-page. We take different routes depending on this.
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink()
2018-03-16 13:34 ` Kirill A. Shutemov
@ 2018-03-16 14:42 ` Tetsuo Handa
0 siblings, 0 replies; 9+ messages in thread
From: Tetsuo Handa @ 2018-03-16 14:42 UTC (permalink / raw)
To: kirill
Cc: mhocko, kirill.shutemov, akpm, linux-mm, linux-kernel, stable, linux-mm
Kirill A. Shutemov wrote:
> On Fri, Mar 16, 2018 at 10:14:24PM +0900, Tetsuo Handa wrote:
> > f2fs is doing
> >
> > page = f2fs_pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0);
> >
> > which calls
> >
> > struct page *pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0);
> >
> > . Then, can't we define
> >
> > static inline struct page *find_trylock_page(struct address_space *mapping,
> > pgoff_t offset)
> > {
> > return pagecache_get_page(mapping, offset, FGP_LOCK|FGP_NOWAIT, 0);
> > }
> >
> > and replace find_lock_page() with find_trylock_page() ?
>
> This won't work in this case. We need to destinct no-page-in-page-cache
> from failed-to-lock-page. We take different routes depending on this.
>
OK. Then, I think we should avoid reordering trylock_page() and PageTransHuge()
without patch description why it is safe. Below patch preserves the ordering
and sounds safer for stable. But either patch, please add why it is safe to omit
"/* Has the page been truncated? */" check which would have been done for FGP_LOCK
in patch description.
---
mm/shmem.c | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/mm/shmem.c b/mm/shmem.c
index 8ead6cb..5e94ca4 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -493,16 +493,27 @@ static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
info = list_entry(pos, struct shmem_inode_info, shrinklist);
inode = &info->vfs_inode;
- if (nr_to_split && split >= nr_to_split) {
- iput(inode);
- continue;
- }
+ if (nr_to_split && split >= nr_to_split)
+ goto leave;
- page = find_lock_page(inode->i_mapping,
+ page = find_get_page(inode->i_mapping,
(inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT);
if (!page)
goto drop;
+ /*
+ * Leave the inode on the list if we failed to lock
+ * the page at this time.
+ *
+ * Waiting for the lock may lead to deadlock in the
+ * reclaim path.
+ */
+ if (!trylock_page(page)) {
+ put_page(page);
+ goto leave;
+ }
+
+ /* No huge page at the end of the file: nothing to split */
if (!PageTransHuge(page)) {
unlock_page(page);
put_page(page);
@@ -513,16 +524,15 @@ static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
unlock_page(page);
put_page(page);
- if (ret) {
- /* split failed: leave it on the list */
- iput(inode);
- continue;
- }
+ /* If split failed leave the inode on the list */
+ if (ret)
+ goto leave;
split++;
drop:
list_del_init(&info->shrinklist);
removed++;
+leave:
iput(inode);
}
--
^ permalink raw reply related [flat|nested] 9+ messages in thread
end of thread, other threads:[~2018-03-16 14:42 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-03-16 10:59 [PATCH] mm/shmem: Do not wait for lock_page() in shmem_unused_huge_shrink() Kirill A. Shutemov
2018-03-16 12:13 ` Michal Hocko
2018-03-16 12:25 ` Kirill A. Shutemov
2018-03-16 12:58 ` Michal Hocko
2018-03-16 13:02 ` Kirill A. Shutemov
2018-03-16 13:14 ` Tetsuo Handa
2018-03-16 13:20 ` Michal Hocko
2018-03-16 13:34 ` Kirill A. Shutemov
2018-03-16 14:42 ` Tetsuo Handa
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