diff options
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 26 |
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; |