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 v3] xfs: Print comm name and pid when open-coded __GFP_NOFAIL allocation stucks
Date: Tue, 22 Sep 2015 17:03:43 +0900 [thread overview]
Message-ID: <1442909023-4088-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <20150922051253.GB3902@dastard>
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 because these functions
are passing __GFP_NOWARN which suppresses not only backtrace but comm name
and pid.
[ 66.089978] Kill process 8505 (a.out) sharing same memory
[ 69.748060] XFS: a.out(8082) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x250)
[ 69.798580] XFS: kworker/u16:28(381) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x250)
[ 69.876952] XFS: xfs-data/sda1(399) possible memory allocation deadlock in kmem_alloc (mode:0x8250)
[ 70.359518] XFS: a.out(8412) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x250)
[ 73.299509] XFS: kworker/u16:28(381) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x250)
[ 73.470350] XFS: xfs-data/sda1(399) possible memory allocation deadlock in kmem_alloc (mode:0x8250)
[ 73.664420] XFS: a.out(8082) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x250)
[ 73.967434] XFS: a.out(8412) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x250)
[ 76.950038] XFS: kworker/u16:28(381) possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x250)
[ 76.957938] XFS: xfs-data/sda1(399) possible memory allocation deadlock in kmem_alloc (mode:0x8250)
(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 | 10 ++++++----
fs/xfs/xfs_buf.c | 3 ++-
2 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/fs/xfs/kmem.c b/fs/xfs/kmem.c
index a7a3a63..535c136 100644
--- a/fs/xfs/kmem.c
+++ b/fs/xfs/kmem.c
@@ -55,8 +55,9 @@ kmem_alloc(size_t size, xfs_km_flags_t flags)
return ptr;
if (!(++retries % 100))
xfs_err(NULL,
- "possible memory allocation deadlock in %s (mode:0x%x)",
- __func__, lflags);
+ "%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);
}
@@ -120,8 +121,9 @@ kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags)
return ptr;
if (!(++retries % 100))
xfs_err(NULL,
- "possible memory allocation deadlock in %s (mode:0x%x)",
- __func__, lflags);
+ "%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 8ecffb3..cac62e1 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -354,7 +354,8 @@ retry:
*/
if (!(++retries % 100))
xfs_err(NULL,
- "possible memory allocation deadlock in %s (mode:0x%x)",
+ "%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:[~2015-09-22 8:04 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 ` [PATCH 2/2] xfs: Print comm name and pid when open-coded __GFP_NOFAIL allocation stucks Tetsuo Handa
2015-09-20 23:18 ` Dave Chinner
2015-09-21 1:23 ` [PATCH v2] " Tetsuo Handa
2015-09-22 5:12 ` Dave Chinner
2015-09-22 8:03 ` Tetsuo Handa [this message]
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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