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xfs: Print name and pid when memory allocation loops

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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.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Tetsuo Handa
2015-10-12 15:41:29 +11:00
committed by Dave Chinner
parent 1f93e4a96c
commit 5bf97b1cb4
2 changed files with 8 additions and 5 deletions
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6
fs/xfs/kmem.c
View File

@@ -55,7 +55,8 @@ kmem_alloc(size_t size, xfs_km_flags_t flags)
return ptr; return ptr;
if (!(++retries % 100)) if (!(++retries % 100))
xfs_err(NULL, 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__, lflags); __func__, lflags);
congestion_wait(BLK_RW_ASYNC, HZ/50); congestion_wait(BLK_RW_ASYNC, HZ/50);
} while (1); } while (1);
@@ -120,7 +121,8 @@ kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags)
return ptr; return ptr;
if (!(++retries % 100)) if (!(++retries % 100))
xfs_err(NULL, 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__, lflags); __func__, lflags);
congestion_wait(BLK_RW_ASYNC, HZ/50); congestion_wait(BLK_RW_ASYNC, HZ/50);
} while (1); } while (1);

3
fs/xfs/xfs_buf.c
View File

@@ -354,7 +354,8 @@ retry:
*/ */
if (!(++retries % 100)) if (!(++retries % 100))
xfs_err(NULL, 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); __func__, gfp_mask);
XFS_STATS_INC(xb_page_retries); XFS_STATS_INC(xb_page_retries);