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Subject[v7 PATCH 11/12] mm: memcontrol: reparent nr_deferred when memcg offline
Date
Now shrinker's nr_deferred is per memcg for memcg aware shrinkers, add to parent's
corresponding nr_deferred when memcg offline.

Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Yang Shi <shy828301@gmail.com>
---
include/linux/memcontrol.h | 1 +
mm/memcontrol.c | 1 +
mm/vmscan.c | 24 ++++++++++++++++++++++++
3 files changed, 26 insertions(+)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index c457fc7bc631..e1c4b93889ad 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1585,6 +1585,7 @@ static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
int alloc_shrinker_info(struct mem_cgroup *memcg);
void free_shrinker_info(struct mem_cgroup *memcg);
void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id);
+void reparent_shrinker_deferred(struct mem_cgroup *memcg);
#else
#define mem_cgroup_sockets_enabled 0
static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f64ad0d044d9..21f36b73f36a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5282,6 +5282,7 @@ static void mem_cgroup_css_offline(struct cgroup_subsys_state *css)
page_counter_set_low(&memcg->memory, 0);

memcg_offline_kmem(memcg);
+ reparent_shrinker_deferred(memcg);
wb_memcg_offline(memcg);

drain_all_stock(memcg);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index dfde6e7fd7f5..66163082cc6f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -389,6 +389,30 @@ 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;
--
2.26.2
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