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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/slab.h
parenta9bb7e620efdfd29b6d1c238041173e411670996 (diff)
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/slab.h')
-rw-r--r--mm/slab.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/slab.h b/mm/slab.h
index 7b6087197997..c63b8699cfa3 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -128,10 +128,11 @@ static inline unsigned long kmem_cache_flags(unsigned long object_size,
#if defined(CONFIG_SLAB)
#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
- SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | SLAB_NOTRACK)
+ SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \
+ SLAB_NOTRACK | SLAB_ACCOUNT)
#elif defined(CONFIG_SLUB)
#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
- SLAB_TEMPORARY | SLAB_NOTRACK)
+ SLAB_TEMPORARY | SLAB_NOTRACK | SLAB_ACCOUNT)
#else
#define SLAB_CACHE_FLAGS (0)
#endif