memcg: move memcg reclaimable page into tail of inactive list

[pandora-kernel.git] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6ef5c53..9e0f05e 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -829,6 +829,32 @@ void mem_cgroup_del_lru(struct page *page)
        mem_cgroup_del_lru_list(page, page_lru(page));
 }
 
+/*
+ * Writeback is about to end against a page which has been marked for immediate
+ * reclaim.  If it still appears to be reclaimable, move it to the tail of the
+ * inactive list.
+ */
+void mem_cgroup_rotate_reclaimable_page(struct page *page)
+{
+       struct mem_cgroup_per_zone *mz;
+       struct page_cgroup *pc;
+       enum lru_list lru = page_lru(page);
+
+       if (mem_cgroup_disabled())
+               return;
+
+       pc = lookup_page_cgroup(page);
+       /* unused or root page is not rotated. */
+       if (!PageCgroupUsed(pc))
+               return;
+       /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
+       smp_rmb();
+       if (mem_cgroup_is_root(pc->mem_cgroup))
+               return;
+       mz = page_cgroup_zoneinfo(pc);
+       list_move_tail(&pc->lru, &mz->lists[lru]);
+}
+
 void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru)
 {
        struct mem_cgroup_per_zone *mz;