On Sun, Feb 07, 2016 at 08:27:33PM +0300, Vladimir Davydov wrote: > As kmem accounting is now either enabled for all cgroups or disabled > system-wide, there's no point in having memcg_kmem_online() helper - > instead one can use memcg_kmem_enabled() and mem_cgroup_online(), as > shrink_slab() now does. > > There are only two places left where this helper is used - > __memcg_kmem_charge() and memcg_create_kmem_cache(). The former can only > be called if memcg_kmem_enabled() returned true. Since the cgroup it > operates on is online, mem_cgroup_is_root() check will be enough. > > memcg_create_kmem_cache() can't use mem_cgroup_online() helper instead > of memcg_kmem_online(), because it relies on the fact that in > memcg_offline_kmem() memcg->kmem_state is changed before > memcg_deactivate_kmem_caches() is called, but there we can just > open-code the check. > > Signed-off-by: Vladimir Davydov <vdavy...@virtuozzo.com>
Nice. I like the direct check for the root memcg. Acked-by: Johannes Weiner <han...@cmpxchg.org>
