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. Suggested-by: Roman Gushchin <guro@xxxxxx> Signed-off-by: Waiman Long <longman@xxxxxxxxxx> --- mm/slab_common.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/slab_common.c b/mm/slab_common.c index bbaf41a7c77e..a0ff8e1d8b67 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -841,6 +841,13 @@ 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; } /* -- 2.18.1
