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memcg: remove memcg->reclaim_param_lock

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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>
This commit is contained in:
Johannes Weiner 2011-03-23 16:42:32 -07:00 committed by Linus Torvalds
parent 4dc03de1b2
commit bf1ff2635a
1 changed files with 1 additions and 17 deletions
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18
mm/memcontrol.c
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@ -218,12 +218,6 @@ struct mem_cgroup {
* 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 long long mem_cgroup_margin(struct mem_cgroup *mem)
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 @@ mem_cgroup_select_victim(struct mem_cgroup *root_mem)
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 @@ static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft,
return -EINVAL;
}
spin_lock(&memcg->reclaim_param_lock);
memcg->swappiness = val;
spin_unlock(&memcg->reclaim_param_lock);
cgroup_unlock();
@ -4526,7 +4511,6 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
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)