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memcontrol: implement mem_cgroup_tryget_online()

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This patch implements a helper function that try to get a reference to an
memcg's css, as well as checking if it is online.  This new function is
almost exactly the same as the existing mem_cgroup_tryget(), except for
the onlineness check.  In the !CONFIG_MEMCG case, it always returns true,
analogous to mem_cgroup_tryget().  This is useful for e.g to the new zswap
writeback scheme, where we need to select the next online memcg as a
candidate for the global limit reclaim.

Link: https://lkml.kernel.org/r/20231130194023.4102148-3-nphamcs@gmail.com
Signed-off-by: Nhat Pham <nphamcs@gmail.com>
Tested-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Yosry Ahmed <yosryahmed@google.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Nhat Pham 2023-11-30 11:40:19 -08:00 committed by Andrew Morton
parent 0a97c01cd2
commit fdc4161ff6
1 changed files with 10 additions and 0 deletions
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10
include/linux/memcontrol.h
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@ -821,6 +821,11 @@ static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg)
return !memcg || css_tryget(&memcg->css);
}
static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
{
return !memcg || css_tryget_online(&memcg->css);
}
static inline void mem_cgroup_put(struct mem_cgroup *memcg)
{
if (memcg)
@ -1349,6 +1354,11 @@ static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg)
return true;
}
static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
{
return true;
}
static inline void mem_cgroup_put(struct mem_cgroup *memcg)
{
}