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| author | Namhyung Kim <namhyung@gmail.com> | 2011-05-26 16:25:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-26 17:12:35 -0700 |
| commit | 6a5b18d2bd79795407bf65451a2013bf4dfb588b (patch) | |
| tree | 0db53d8192c1beedf1628918feb91bec93e2537f /mm/page_cgroup.c | |
| parent | 33278f7f0a9e5a9b29f59e07b7e3182d27769ac2 (diff) | |
| download | lwn-6a5b18d2bd79795407bf65451a2013bf4dfb588b.tar.gz lwn-6a5b18d2bd79795407bf65451a2013bf4dfb588b.zip | |
memcg: move page-freeing code out of lock
Move page-freeing code out of swap_cgroup_mutex in the hope that it could
reduce few of theoretical contentions between swapons and/or swapoffs.
This is just a cleanup, no functional changes.
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_cgroup.c')
| -rw-r--r-- | mm/page_cgroup.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c index 5524e8bd7437..74ccff61d1be 100644 --- a/mm/page_cgroup.c +++ b/mm/page_cgroup.c @@ -492,8 +492,8 @@ int swap_cgroup_swapon(int type, unsigned long max_pages) /* memory shortage */ ctrl->map = NULL; ctrl->length = 0; - vfree(array); mutex_unlock(&swap_cgroup_mutex); + vfree(array); goto nomem; } mutex_unlock(&swap_cgroup_mutex); @@ -508,7 +508,8 @@ nomem: void swap_cgroup_swapoff(int type) { - int i; + struct page **map; + unsigned long i, length; struct swap_cgroup_ctrl *ctrl; if (!do_swap_account) @@ -516,17 +517,20 @@ void swap_cgroup_swapoff(int type) mutex_lock(&swap_cgroup_mutex); ctrl = &swap_cgroup_ctrl[type]; - if (ctrl->map) { - for (i = 0; i < ctrl->length; i++) { - struct page *page = ctrl->map[i]; + map = ctrl->map; + length = ctrl->length; + ctrl->map = NULL; + ctrl->length = 0; + mutex_unlock(&swap_cgroup_mutex); + + if (map) { + for (i = 0; i < length; i++) { + struct page *page = map[i]; if (page) __free_page(page); } - vfree(ctrl->map); - ctrl->map = NULL; - ctrl->length = 0; + vfree(map); } - mutex_unlock(&swap_cgroup_mutex); } #endif |