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authorVladimir Davydov <vdavydov@virtuozzo.com>2016-01-14 15:18:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-14 16:00:49 -0800
commit230e9fc2860450fbb1f33bdcf9093d92d7d91f5b (patch)
treed0cb29d821cc5c3ca49066f0ca5d9149066b157f /mm/slub.c
parenta9bb7e620efdfd29b6d1c238041173e411670996 (diff)
downloadlwn-230e9fc2860450fbb1f33bdcf9093d92d7d91f5b.tar.gz
lwn-230e9fc2860450fbb1f33bdcf9093d92d7d91f5b.zip
slab: add SLAB_ACCOUNT flag
Currently, if we want to account all objects of a particular kmem cache, we have to pass __GFP_ACCOUNT to each kmem_cache_alloc call, which is inconvenient. This patch introduces SLAB_ACCOUNT flag which if passed to kmem_cache_create will force accounting for every allocation from this cache even if __GFP_ACCOUNT is not passed. This patch does not make any of the existing caches use this flag - it will be done later in the series. Note, a cache with SLAB_ACCOUNT cannot be merged with a cache w/o SLAB_ACCOUNT, because merged caches share the same kmem_cache struct and hence cannot have different sets of SLAB_* flags. Thus using this flag will probably reduce the number of merged slabs even if kmem accounting is not used (only compiled in). Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com> Suggested-by: Tejun Heo <tj@kernel.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Greg Thelen <gthelen@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 46997517406e..2d0e610d195a 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5362,6 +5362,8 @@ static char *create_unique_id(struct kmem_cache *s)
*p++ = 'F';
if (!(s->flags & SLAB_NOTRACK))
*p++ = 't';
+ if (s->flags & SLAB_ACCOUNT)
+ *p++ = 'A';
if (p != name + 1)
*p++ = '-';
p += sprintf(p, "%07d", s->size);