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-rw-r--r--mm/memcontrol.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6ef5c53dffcb..9e0f05efd114 100644
--- 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;