[PATCH v2 21/22] mm: free lruvec in memcgroup via rcu

[Konstantin Khlebnikov]

This is required for splitting lru_lock into per-lruvec pieces.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>
---
 mm/memcontrol.c |   20 +++++++++++++++-----
 1 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 69763da..eb024c1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -148,6 +148,7 @@ struct mem_cgroup_per_zone {
 
 struct mem_cgroup_per_node {
 	struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES];
+	struct rcu_head		rcu_head;
 };
 
 struct mem_cgroup_lru_info {
@@ -4657,18 +4658,27 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
 	return 0;
 }
 
+static void free_pn_rcu(struct rcu_head *rcu_head)
+{
+       struct mem_cgroup_per_node *pn;
+       int zone;
+
+       pn = container_of(rcu_head, struct mem_cgroup_per_node, rcu_head);
+
+       for (zone = 0; zone < MAX_NR_ZONES; zone++)
+	       wait_lruvec_unlock(&pn->zoneinfo[zone].lruvec);
+
+       kfree(pn);
+}
+
 static void free_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
 {
 	struct mem_cgroup_per_node *pn = memcg->info.nodeinfo[node];
-	int zone;
 
 	if (!pn)
 		return;
 
-	for (zone = 0; zone < MAX_NR_ZONES; zone++)
-		wait_lruvec_unlock(&pn->zoneinfo[zone].lruvec);
-
-	kfree(pn);
+	call_rcu(&pn->rcu_head, free_pn_rcu);
 }
 
 static struct mem_cgroup *mem_cgroup_alloc(void)

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