From: Kairui Song <ryncsn@gmail.com>
To: cgroups@vger.kernel.org, linux-mm@kvack.org
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Shakeel Butt <shakeelb@google.com>,
Muchun Song <songmuchun@bytedance.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Kairui Song <kasong@tencent.com>
Subject: [PATCH v2 1/2] mm: memcontrol: use memcg_kmem_enabled in count_objcg_event
Date: Tue, 20 Sep 2022 02:06:33 +0800 [thread overview]
Message-ID: <20220919180634.45958-2-ryncsn@gmail.com> (raw)
In-Reply-To: <20220919180634.45958-1-ryncsn@gmail.com>
From: Kairui Song <kasong@tencent.com>
There are currently two helpers for checking if cgroup kmem
accounting is enabled:
- mem_cgroup_kmem_disabled
- memcg_kmem_enabled
mem_cgroup_kmem_disabled is a simple helper that returns true
if cgroup.memory=nokmem is specified, otherwise returns false.
memcg_kmem_enabled is a bit different, it returns true if
cgroup.memory=nokmem is not specified and there was at least one
non-root memory control enabled cgroup ever created. This help improve
performance when kmem accounting was not actually activated. And it's
optimized with static branch.
The usage of mem_cgroup_kmem_disabled is for sub-systems that need to
preallocate data for kmem accounting since they could be initialized
before kmem accounting is activated. But count_objcg_event doesn't
need that, so using memcg_kmem_enabled is better here.
Signed-off-by: Kairui Song <kasong@tencent.com>
---
include/linux/memcontrol.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 6257867fbf95..e6d3d5870d6f 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1779,7 +1779,7 @@ static inline void count_objcg_event(struct obj_cgroup *objcg,
{
struct mem_cgroup *memcg;
- if (mem_cgroup_kmem_disabled())
+ if (!memcg_kmem_enabled())
return;
rcu_read_lock();
--
2.35.2
next prev parent reply other threads:[~2022-09-19 18:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-19 18:06 [PATCH v2 0/2] mm: memcontrol: cleanup and optimize for two accounting params Kairui Song
2022-09-19 18:06 ` Kairui Song [this message]
2022-09-19 21:36 ` [PATCH v2 1/2] mm: memcontrol: use memcg_kmem_enabled in count_objcg_event Shakeel Butt
2022-09-20 2:27 ` Roman Gushchin
2022-09-20 2:41 ` Muchun Song
2022-09-19 18:06 ` [PATCH v2 2/2] mm: memcontrol: make cgroup_memory_noswap a static key Kairui Song
2022-09-19 21:37 ` Shakeel Butt
2022-09-20 2:29 ` Roman Gushchin
2022-09-20 2:43 ` Muchun Song
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