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@xxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
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 e7208105203c..9223bb48e80f 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
--
1.7.4
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