linux-kernel - [PATCH 1/2] mm: memcontrol: cleanup css

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Date:	Tue, 1 Mar 2016 14:13:12 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>, <cgroups@...r.kernel.org>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] mm: memcontrol: cleanup css_reset callback

 - Do not take memcg_limit_mutex for resetting limits - the cgroup
   cannot be altered from userspace anymore, so no need to protect them.

 - Use plain page_counter_limit() for resetting ->memory and ->memsw
   limits instead of mem_cgrouop_resize_* helpers - we enlarge the
   limits, so no need in special handling.

 - Reset ->swap and ->tcpmem limits as well.

Signed-off-by: Vladimir Davydov <vdavydov@...tuozzo.com>
---
 mm/memcontrol.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ae8b81c55685..8615b066b642 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4257,9 +4257,11 @@ static void mem_cgroup_css_reset(struct cgroup_subsys_state *css)
 {
 	struct mem_cgroup *memcg = mem_cgroup_from_css(css);
 
-	mem_cgroup_resize_limit(memcg, PAGE_COUNTER_MAX);
-	mem_cgroup_resize_memsw_limit(memcg, PAGE_COUNTER_MAX);
-	memcg_update_kmem_limit(memcg, PAGE_COUNTER_MAX);
+	page_counter_limit(&memcg->memory, PAGE_COUNTER_MAX);
+	page_counter_limit(&memcg->swap, PAGE_COUNTER_MAX);
+	page_counter_limit(&memcg->memsw, PAGE_COUNTER_MAX);
+	page_counter_limit(&memcg->kmem, PAGE_COUNTER_MAX);
+	page_counter_limit(&memcg->tcpmem, PAGE_COUNTER_MAX);
 	memcg->low = 0;
 	memcg->high = PAGE_COUNTER_MAX;
 	memcg->soft_limit = PAGE_COUNTER_MAX;
-- 
2.1.4