From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: david@fromorbit.com
Cc: xfs@oss.sgi.com, linux-mm@kvack.org,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
Michal Hocko <mhocko@suse.com>
Subject: [PATCH 2/2] xfs: Print comm name and pid when open-coded __GFP_NOFAIL allocation stucks
Date: Sun, 20 Sep 2015 16:03:14 +0900 [thread overview]
Message-ID: <1442732594-4205-2-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <1442732594-4205-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp>
This patch adds comm name and pid to warning messages printed by
kmem_alloc(), kmem_zone_alloc() and xfs_buf_allocate_memory().
This will help telling which memory allocations (e.g. kernel worker
threads, OOM victim tasks, neither) are stalling.
[ 135.568662] Out of memory: Kill process 9593 (a.out) score 998 or sacrifice child
[ 135.570195] Killed process 9593 (a.out) total-vm:4700kB, anon-rss:488kB, file-rss:0kB
[ 137.473691] XFS: kworker/u16:29(383) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x1250)
[ 137.497662] XFS: a.out(8944) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x1250)
[ 137.598219] XFS: a.out(9658) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x1250)
[ 139.494529] XFS: kworker/u16:29(383) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x1250)
[ 139.517196] XFS: a.out(8944) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x1250)
[ 139.616396] XFS: a.out(9658) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x1250)
[ 141.512753] XFS: kworker/u16:29(383) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x1250)
[ 141.531421] XFS: a.out(8944) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x1250)
[ 141.633574] XFS: a.out(9658) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x1250)
(Strictly speaking, we want task_lock()/task_unlock() when reading comm name.)
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Michal Hocko <mhocko@suse.com>
---
fs/xfs/kmem.c | 6 ++++--
fs/xfs/xfs_buf.c | 3 ++-
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/fs/xfs/kmem.c b/fs/xfs/kmem.c
index 1fcf90d..95a5b76 100644
--- a/fs/xfs/kmem.c
+++ b/fs/xfs/kmem.c
@@ -54,8 +54,9 @@ kmem_alloc(size_t size, xfs_km_flags_t flags)
if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
return ptr;
if (!(++retries % 100))
- xfs_err(NULL,
+ xfs_err(NULL, "%s(%u) "
"possible memory allocation deadlock in %s (mode:0x%x)",
+ current->comm, current->pid,
__func__, lflags);
congestion_wait(BLK_RW_ASYNC, HZ/50);
} while (1);
@@ -119,8 +120,9 @@ kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags)
if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
return ptr;
if (!(++retries % 100))
- xfs_err(NULL,
+ xfs_err(NULL, "%s(%u) "
"possible memory allocation deadlock in %s (mode:0x%x)",
+ current->comm, current->pid,
__func__, lflags);
congestion_wait(BLK_RW_ASYNC, HZ/50);
} while (1);
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index cbd4f91..5deb629 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -353,8 +353,9 @@ retry:
* handle buffer allocation failures we can't do much.
*/
if (!(++retries % 100))
- xfs_err(NULL,
+ xfs_err(NULL, "%s(%u) "
"possible memory allocation deadlock in %s (mode:0x%x)",
+ current->comm, current->pid,
__func__, gfp_mask);
XFS_STATS_INC(xb_page_retries);
--
1.8.3.1
--
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next prev parent reply other threads:[~2015-09-20 7:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-20 7:03 [PATCH 1/2] xfs: Add __GFP_NORETRY and __GFP_NOWARN to open-coded __GFP_NOFAIL allocations Tetsuo Handa
2015-09-20 7:03 ` Tetsuo Handa [this message]
2015-09-20 23:18 ` [PATCH 2/2] xfs: Print comm name and pid when open-coded __GFP_NOFAIL allocation stucks Dave Chinner
2015-09-21 1:23 ` [PATCH v2] " Tetsuo Handa
2015-09-22 5:12 ` Dave Chinner
2015-09-22 8:03 ` [PATCH v3] " Tetsuo Handa
2015-09-20 23:11 ` [PATCH 1/2] xfs: Add __GFP_NORETRY and __GFP_NOWARN to open-coded __GFP_NOFAIL allocations Dave Chinner
2015-09-21 1:23 ` Tetsuo Handa
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