memcg: remove memcg->reclaim_param_lock
The reclaim_param_lock is only taken around single reads and writes to
integer variables and is thus superfluous. Drop it.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b35a28d..8f93819 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -218,12 +218,6 @@
* per zone LRU lists.
*/
struct mem_cgroup_lru_info info;
-
- /*
- protect against reclaim related member.
- */
- spinlock_t reclaim_param_lock;
-
/*
* While reclaiming in a hierarchy, we cache the last child we
* reclaimed from.
@@ -1130,17 +1124,12 @@
static unsigned int get_swappiness(struct mem_cgroup *memcg)
{
struct cgroup *cgrp = memcg->css.cgroup;
- unsigned int swappiness;
/* root ? */
if (cgrp->parent == NULL)
return vm_swappiness;
- spin_lock(&memcg->reclaim_param_lock);
- swappiness = memcg->swappiness;
- spin_unlock(&memcg->reclaim_param_lock);
-
- return swappiness;
+ return memcg->swappiness;
}
static void mem_cgroup_start_move(struct mem_cgroup *mem)
@@ -1356,13 +1345,11 @@
rcu_read_unlock();
/* Updates scanning parameter */
- spin_lock(&root_mem->reclaim_param_lock);
if (!css) {
/* this means start scan from ID:1 */
root_mem->last_scanned_child = 0;
} else
root_mem->last_scanned_child = found;
- spin_unlock(&root_mem->reclaim_param_lock);
}
return ret;
@@ -3868,9 +3855,7 @@
return -EINVAL;
}
- spin_lock(&memcg->reclaim_param_lock);
memcg->swappiness = val;
- spin_unlock(&memcg->reclaim_param_lock);
cgroup_unlock();
@@ -4526,7 +4511,6 @@
res_counter_init(&mem->memsw, NULL);
}
mem->last_scanned_child = 0;
- spin_lock_init(&mem->reclaim_param_lock);
INIT_LIST_HEAD(&mem->oom_notify);
if (parent)