On Mon, Sep 21, 2015 at 10:23:57AM +0900, Tetsuo Handa wrote: > 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. > > [ 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@xxxxxxxxxxxxxxxxxxx> > Cc: Michal Hocko <mhocko@xxxxxxxx> > --- > 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..735095a 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); <=80 columns, please. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>