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| author | Roman Gushchin <roman.gushchin@linux.dev> | 2023-02-13 20:29:22 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-17 05:43:56 +0100 |
| commit | f7a449f779608efe1941a0e0c4bd7b5f57000be7 (patch) | |
| tree | f8f97a44778de08a806b9e06a4c54e331273a043 /mm/percpu.c | |
| parent | sh: initialize max_mapnr (diff) | |
| download | linux-f7a449f779608efe1941a0e0c4bd7b5f57000be7.tar.xz linux-f7a449f779608efe1941a0e0c4bd7b5f57000be7.zip | |
mm: memcontrol: rename memcg_kmem_enabled()
Currently there are two kmem-related helper functions with a confusing
semantics: memcg_kmem_enabled() and mem_cgroup_kmem_disabled().
The problem is that an obvious expectation
memcg_kmem_enabled() == !mem_cgroup_kmem_disabled(),
can be false.
mem_cgroup_kmem_disabled() is similar to mem_cgroup_disabled(): it returns
true only if CONFIG_MEMCG_KMEM is not set or the kmem accounting is
disabled using a boot time kernel option "cgroup.memory=nokmem". It never
changes the value dynamically.
memcg_kmem_enabled() is different: it always returns false until the first
non-root memory cgroup will get online (assuming the kernel memory
accounting is enabled). It's goal is to improve the performance on
systems without the cgroupfs mounted/memory controller enabled or on the
systems with only the root memory cgroup.
To make things more obvious and avoid potential bugs, let's rename
memcg_kmem_enabled() to memcg_kmem_online().
Link: https://lkml.kernel.org/r/20230213192922.1146370-1-roman.gushchin@linux.dev
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Dennis Zhou <dennis@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/percpu.c')
| -rw-r--r-- | mm/percpu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/percpu.c b/mm/percpu.c index acd78da0493b..28e07ede46f6 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -1625,7 +1625,7 @@ static bool pcpu_memcg_pre_alloc_hook(size_t size, gfp_t gfp, { struct obj_cgroup *objcg; - if (!memcg_kmem_enabled() || !(gfp & __GFP_ACCOUNT)) + if (!memcg_kmem_online() || !(gfp & __GFP_ACCOUNT)) return true; objcg = get_obj_cgroup_from_current(); |