diff options
| author | Waiman Long <longman@redhat.com> | 2020-10-13 16:52:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-13 18:38:30 -0700 |
| commit | 8d387a5f172f26ff8c76096d5876b881dec6b7ce (patch) | |
| tree | dc9826a812183e50957132e408e270c466f5b0f0 /mm/memcontrol.c | |
| parent | f9f84ec56f7e370cc6fc478b7d09fbf41de970ea (diff) | |
| download | linux-8d387a5f172f26ff8c76096d5876b881dec6b7ce.tar.bz2 | |
mm/memcg: simplify mem_cgroup_get_max()
mem_cgroup_get_max() used to get memory+swap max from both the v1 memsw
and v2 memory+swap page counters & return the maximum of these 2 values.
This is redundant and it is more efficient to just get either the v1 or
the v2 values depending on which one is currently in use.
[longman@redhat.com: v4]
Link: https://lkml.kernel.org/r/20200914150928.7841-1-longman@redhat.com
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Chris Down <chris@chrisdown.name>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Yafang Shao <laoar.shao@gmail.com>
Link: https://lkml.kernel.org/r/20200914024452.19167-3-longman@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 09e851f0bee3..962f8d649b83 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1633,17 +1633,19 @@ void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg) */ unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg) { - unsigned long max; - - max = READ_ONCE(memcg->memory.max); - if (mem_cgroup_swappiness(memcg)) { - unsigned long memsw_max; - unsigned long swap_max; - - memsw_max = memcg->memsw.max; - swap_max = READ_ONCE(memcg->swap.max); - swap_max = min(swap_max, (unsigned long)total_swap_pages); - max = min(max + swap_max, memsw_max); + unsigned long max = READ_ONCE(memcg->memory.max); + + if (cgroup_subsys_on_dfl(memory_cgrp_subsys)) { + if (mem_cgroup_swappiness(memcg)) + max += min(READ_ONCE(memcg->swap.max), + (unsigned long)total_swap_pages); + } else { /* v1 */ + if (mem_cgroup_swappiness(memcg)) { + /* Calculate swap excess capacity from memsw limit */ + unsigned long swap = READ_ONCE(memcg->memsw.max) - max; + + max += min(swap, (unsigned long)total_swap_pages); + } } return max; } |