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authorYang Shi <shy828301@gmail.com>2021-05-04 18:36:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-05-05 11:27:23 -0700
commita178015cde69981cdcd8f109c5abc98703fead62 (patch)
tree5e905878c7884006599c55f633b615d17a4e6763 /mm/vmscan.c
parent476b30a0949aec865dcc64d4c14f621b1a8afd12 (diff)
mm: memcontrol: reparent nr_deferred when memcg offline
Now shrinker's nr_deferred is per memcg for memcg aware shrinkers, add to parent's corresponding nr_deferred when memcg offline. Link: https://lkml.kernel.org/r/20210311190845.9708-13-shy828301@gmail.com Signed-off-by: Yang Shi <shy828301@gmail.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Kirill Tkhai <ktkhai@virtuozzo.com> Acked-by: Roman Gushchin <guro@fb.com> Reviewed-by: Shakeel Butt <shakeelb@google.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9617c5ff3e98..8c2d2003acbe 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -397,6 +397,30 @@ static long add_nr_deferred_memcg(long nr, int nid, struct shrinker *shrinker,
return atomic_long_add_return(nr, &info->nr_deferred[shrinker->id]);
}
+void reparent_shrinker_deferred(struct mem_cgroup *memcg)
+{
+ int i, nid;
+ long nr;
+ struct mem_cgroup *parent;
+ struct shrinker_info *child_info, *parent_info;
+
+ parent = parent_mem_cgroup(memcg);
+ if (!parent)
+ parent = root_mem_cgroup;
+
+ /* Prevent from concurrent shrinker_info expand */
+ down_read(&shrinker_rwsem);
+ for_each_node(nid) {
+ child_info = shrinker_info_protected(memcg, nid);
+ parent_info = shrinker_info_protected(parent, nid);
+ for (i = 0; i < shrinker_nr_max; i++) {
+ nr = atomic_long_read(&child_info->nr_deferred[i]);
+ atomic_long_add(nr, &parent_info->nr_deferred[i]);
+ }
+ }
+ up_read(&shrinker_rwsem);
+}
+
static bool cgroup_reclaim(struct scan_control *sc)
{
return sc->target_mem_cgroup;