diff options
| author | Roman Gushchin <guro@fb.com> | 2020-08-06 23:21:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-07 11:33:25 -0700 |
| commit | eda330e57b26df8fabce184736ae3d11e7a104bd (patch) | |
| tree | 5c6dad88132ac29281467ae543fbbc4d99c59b78 /include | |
| parent | 74d555bed5d0f8a1264f1e083183f5409b1aa36a (diff) | |
mm: kmem: switch to static_branch_likely() in memcg_kmem_enabled()
Currently memcg_kmem_enabled() is optimized for the kernel memory
accounting being off. It was so for a long time, and arguably the reason
behind was that the kernel memory accounting was initially an opt-in
feature. However, now it's on by default on both cgroup v1 and cgroup v2,
and it's on for all cgroups. So let's switch over to
static_branch_likely() to reflect this fact.
Unlikely there is a significant performance difference, as the cost of a
memory allocation and its accounting significantly exceeds the cost of a
jump. However, the conversion makes the code look more logically.
Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>
Link: http://lkml.kernel.org/r/20200707173612.124425-3-guro@fb.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/memcontrol.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 624400c27eba..3f8ff6519c9d 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1448,7 +1448,7 @@ void memcg_put_cache_ids(void); static inline bool memcg_kmem_enabled(void) { - return static_branch_unlikely(&memcg_kmem_enabled_key); + return static_branch_likely(&memcg_kmem_enabled_key); } static inline bool memcg_kmem_bypass(void) |