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mm: vmpressure: use mem_cgroup_is_root API 

Use mem_cgroup_is_root() API to check if memcg is root memcg instead of
open coding.

Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: David Rientjes <rientjes@google.com>
Link: http://lkml.kernel.org/r/1581398649-125989-2-git-send-email-yang.shi@linux.alibaba.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yang Shi 2020-04-01 21:10:02 -07:00 committed by Linus Torvalds
parent 565dc84231
commit d8a1c03ff7
1 changed files with 1 additions and 1 deletions
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2
mm/vmpressure.c
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@ -280,7 +280,7 @@ void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
enum vmpressure_levels level;
/* For now, no users for root-level efficiency */
if (!memcg || memcg == root_mem_cgroup)
if (!memcg || mem_cgroup_is_root(memcg))
return;
spin_lock(&vmpr->sr_lock);