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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2012-08-01 03:42:46 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-08-01 05:42:42 +0400
commit3c935d189be9bb877c5a1110ac5fbf9c8e310658 (patch)
tree84aa62c9309a27cba588bb1a822a344b648a3497 /mm/memcontrol.c
parent6068bf0104becf07792b2867bc4d17c369419f8b (diff)
downloadlinux-3c935d189be9bb877c5a1110ac5fbf9c8e310658.tar.xz
memcg: make mem_cgroup_force_empty_list() return bool
mem_cgroup_force_empty_list() just returns 0 or -EBUSY and -EBUSY indicates 'you need to retry'. Make mem_cgroup_force_empty_list() return a bool to simplify the logic. [akpm@linux-foundation.org: rework mem_cgroup_force_empty_list()'s comment] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c19
1 files changed, 7 insertions, 12 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 964786634746..a2677e0a6387 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3609,10 +3609,12 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
}
/*
- * This routine traverse page_cgroup in given list and drop them all.
- * *And* this routine doesn't reclaim page itself, just removes page_cgroup.
+ * Traverse a specified page_cgroup list and try to drop them all. This doesn't
+ * reclaim the pages page themselves - it just removes the page_cgroups.
+ * Returns true if some page_cgroups were not freed, indicating that the caller
+ * must retry this operation.
*/
-static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
+static bool mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
int node, int zid, enum lru_list lru)
{
struct mem_cgroup_per_zone *mz;
@@ -3620,7 +3622,6 @@ static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
struct list_head *list;
struct page *busy;
struct zone *zone;
- int ret = 0;
zone = &NODE_DATA(node)->node_zones[zid];
mz = mem_cgroup_zoneinfo(memcg, node, zid);
@@ -3634,7 +3635,6 @@ static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
struct page_cgroup *pc;
struct page *page;
- ret = 0;
spin_lock_irqsave(&zone->lru_lock, flags);
if (list_empty(list)) {
spin_unlock_irqrestore(&zone->lru_lock, flags);
@@ -3651,19 +3651,14 @@ static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
pc = lookup_page_cgroup(page);
- ret = mem_cgroup_move_parent(page, pc, memcg);
-
- if (ret == -EBUSY || ret == -EINVAL) {
+ if (mem_cgroup_move_parent(page, pc, memcg)) {
/* found lock contention or "pc" is obsolete. */
busy = page;
cond_resched();
} else
busy = NULL;
}
-
- if (!ret && !list_empty(list))
- return -EBUSY;
- return ret;
+ return !list_empty(list);
}
/*