diff options
| author | Johannes Weiner <hannes@cmpxchg.org> | 2011-03-23 16:42:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-23 19:46:29 -0700 |
| commit | bf1ff2635a5fda207fc870df348bfc766e8dcd4d (patch) | |
| tree | d4085b3bdbe608f6c8f708cb93080051b341d7fe /mm | |
| parent | 4dc03de1b29901b61cb27e4cab44a7f578dc0fc9 (diff) | |
| download | lwn-bf1ff2635a5fda207fc870df348bfc766e8dcd4d.tar.gz lwn-bf1ff2635a5fda207fc870df348bfc766e8dcd4d.zip | |
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memcontrol.c | 18 |
1 files changed, 1 insertions, 17 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index b35a28d80ab5..8f9381976c59 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -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) |