diff options
| author | Waiman Long <longman@redhat.com> | 2021-06-29 05:37:41 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-29 20:53:49 +0300 |
| commit | 13e680fb6a1e7749ef4f4824ed883684ceb838df (patch) | |
| tree | 71a54310855e3c3e31f75e9ffa568d81121a78db /mm | |
| parent | 494c1dfe855ec1f70f89552fce5eadf4a1717552 (diff) | |
| download | linux-13e680fb6a1e7749ef4f4824ed883684ceb838df.tar.xz | |
mm: memcg/slab: disable cache merging for KMALLOC_NORMAL caches
The KMALLOC_NORMAL (kmalloc-<n>) caches are for unaccounted objects only
when CONFIG_MEMCG_KMEM is enabled. To make sure that this condition
remains true, we will have to prevent KMALOC_NORMAL caches to merge with
other kmem caches. This is now done by setting its refcount to -1 right
after its creation.
Link: https://lkml.kernel.org/r/20210505200610.13943-4-longman@redhat.com
Signed-off-by: Waiman Long <longman@redhat.com>
Suggested-by: Roman Gushchin <guro@fb.com>
Acked-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/slab_common.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c index db3f356bf725..c126e6f6b5a5 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -856,6 +856,13 @@ new_kmalloc_cache(int idx, enum kmalloc_cache_type type, slab_flags_t flags) kmalloc_info[idx].name[type], kmalloc_info[idx].size, flags, 0, kmalloc_info[idx].size); + + /* + * If CONFIG_MEMCG_KMEM is enabled, disable cache merging for + * KMALLOC_NORMAL caches. + */ + if (IS_ENABLED(CONFIG_MEMCG_KMEM) && (type == KMALLOC_NORMAL)) + kmalloc_caches[type][idx]->refcount = -1; } /* |