Thread (45 messages) 45 messages, 7 authors, 2021-08-05
STALE1761d
Revisions (3)
  1. v1 current
  2. v2 [diff vs current]
  3. v1 [diff vs current]

[PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex

From: Miaohe Lin <hidden>
Date: 2021-07-29 12:58:02
Also in: linux-mm, lkml
Subsystem: control group - memory resource controller (memcg), memory management, the rest · Maintainers: Johannes Weiner, Michal Hocko, Roman Gushchin, Shakeel Butt, Andrew Morton, Linus Torvalds

Since percpu_charge_mutex is only used inside drain_all_stock(), we can
narrow the scope of percpu_charge_mutex by moving it here.

Signed-off-by: Miaohe Lin <redacted>
---
 mm/memcontrol.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6580c2381a3e..a03e24e57cd9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2050,7 +2050,6 @@ struct memcg_stock_pcp {
 #define FLUSHING_CACHED_CHARGE	0
 };
 static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock);
-static DEFINE_MUTEX(percpu_charge_mutex);
 
 #ifdef CONFIG_MEMCG_KMEM
 static void drain_obj_stock(struct obj_stock *stock);
@@ -2209,6 +2208,7 @@ static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
  */
 static void drain_all_stock(struct mem_cgroup *root_memcg)
 {
+	static DEFINE_MUTEX(percpu_charge_mutex);
 	int cpu, curcpu;
 
 	/* If someone's already draining, avoid adding running more workers. */
-- 
2.23.0
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