diff options
| author | Yosry Ahmed <yosryahmed@google.com> | 2023-03-30 19:17:59 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-18 16:29:50 -0700 |
| commit | 4009b2f1887036d30637bc06dd0ade7e18408bb3 (patch) | |
| tree | c1d37c77b18d1669e0e279ef08abb0ae9a23b255 /mm/memcontrol.c | |
| parent | 9fad9aee1f267a8ad1f86b87ae70b2c4d6796164 (diff) | |
| download | linux-next-4009b2f1887036d30637bc06dd0ade7e18408bb3.tar.gz | |
workingset: memcg: sleep when flushing stats in workingset_refault()
In workingset_refault(), we call
mem_cgroup_flush_stats_atomic_ratelimited() to read accurate stats within
an RCU read section and with sleeping disallowed. Move the call above the
RCU read section to make it non-atomic.
Flushing is an expensive operation that scales with the number of cpus and
the number of cgroups in the system, so avoid doing it atomically where
possible.
Since workingset_refault() is the only caller of
mem_cgroup_flush_stats_atomic_ratelimited(), just make it non-atomic, and
rename it to mem_cgroup_flush_stats_ratelimited().
Link: https://lkml.kernel.org/r/20230330191801.1967435-7-yosryahmed@google.com
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Koutný <mkoutny@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vasily Averin <vasily.averin@linux.dev>
Cc: Zefan Li <lizefan.x@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 06786dea50b8..e9e79ceb9a11 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -674,10 +674,10 @@ void mem_cgroup_flush_stats_atomic(void) do_flush_stats(true); } -void mem_cgroup_flush_stats_atomic_ratelimited(void) +void mem_cgroup_flush_stats_ratelimited(void) { if (time_after64(jiffies_64, READ_ONCE(flush_next_time))) - mem_cgroup_flush_stats_atomic(); + mem_cgroup_flush_stats(); } static void flush_memcg_stats_dwork(struct work_struct *w) |