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| author | Muchun Song <songmuchun@bytedance.com> | 2021-06-28 19:37:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-29 10:53:50 -0700 |
| commit | 8dc87c7d1fec8851925ca96ade0d65d3dcf89cce (patch) | |
| tree | e25cb81bef038d010a1aba353fdbb06b9ae5150f /mm/memcontrol.c | |
| parent | c5c8b16b596e15471db22ed8ed10aafbf1a11878 (diff) | |
| download | linux-8dc87c7d1fec8851925ca96ade0d65d3dcf89cce.tar.gz linux-8dc87c7d1fec8851925ca96ade0d65d3dcf89cce.tar.bz2 linux-8dc87c7d1fec8851925ca96ade0d65d3dcf89cce.zip | |
mm: memcontrol: fix page charging in page replacement
Patch series "memcontrol code cleanup and simplification", v3.
This patch (of 8):
The pages aren't accounted at the root level, so do not charge the page to
the root memcg in page replacement. Although we do not display the value
(mem_cgroup_usage) so there shouldn't be any actual problem, but there is
a WARN_ON_ONCE in the page_counter_cancel(). Who knows if it will
trigger? So it is better to fix it.
Link: https://lkml.kernel.org/r/20210417043538.9793-1-songmuchun@bytedance.com
Link: https://lkml.kernel.org/r/20210417043538.9793-2-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Roman Gushchin <guro@fb.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 70690fdf53cc..239f69ed1ac1 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -6984,9 +6984,11 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage) /* Force-charge the new page. The old one will be freed soon */ nr_pages = thp_nr_pages(newpage); - page_counter_charge(&memcg->memory, nr_pages); - if (do_memsw_account()) - page_counter_charge(&memcg->memsw, nr_pages); + if (!mem_cgroup_is_root(memcg)) { + page_counter_charge(&memcg->memory, nr_pages); + if (do_memsw_account()) + page_counter_charge(&memcg->memsw, nr_pages); + } css_get(&memcg->css); commit_charge(newpage, memcg); |