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authorGlauber Costa <glommer@parallels.com>2012-12-19 02:22:31 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-19 03:02:13 +0400
commit6ccfb5bcf52bcf100fa085946f044fdbba015048 (patch)
tree51ceaa2eba8eabd07cca5de3e16b7c0cd85e41c2 /mm/slab.h
parentba6c496ed834a37a26fc6fc87fc9aecb0fa0014d (diff)
downloadlinux-6ccfb5bcf52bcf100fa085946f044fdbba015048.tar.xz
slab: annotate on-slab caches nodelist locks
We currently provide lockdep annotation for kmalloc caches, and also caches that have SLAB_DEBUG_OBJECTS enabled. The reason for this is that we can quite frequently nest in the l3->list_lock lock, which is not something trivial to avoid. My proposal with this patch, is to extend this to caches whose slab management object lives within the slab as well ("on_slab"). The need for this arose in the context of testing kmemcg-slab patches. With such patchset, we can have per-memcg kmalloc caches. So the same path that led to nesting between kmalloc caches will could then lead to in-memcg nesting. Because they are not annotated, lockdep will trigger. Signed-off-by: Glauber Costa <glommer@parallels.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Frederic Weisbecker <fweisbec@redhat.com> Cc: Greg Thelen <gthelen@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: JoonSoo Kim <js1304@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michal Hocko <mhocko@suse.cz> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Rik van Riel <riel@redhat.com> Cc: Suleiman Souhlal <suleiman@google.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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