memcg: add inactive_anon_is_low()

[mirror_ubuntu-artful-kernel.git] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 457d671029b81cf92867955e4ab9edd53aef6e49..6611328460e91a15bbc4d304cadc369cdfb9b600 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -156,6 +156,9 @@ struct mem_cgroup {
        unsigned long   last_oom_jiffies;
        int             obsolete;
        atomic_t        refcnt;
+
+       unsigned int inactive_ratio;
+
        /*
         * statistics. This must be placed at the end of memcg.
         */
@@ -431,6 +434,20 @@ long mem_cgroup_calc_reclaim(struct mem_cgroup *mem, struct zone *zone,
        return (nr_pages >> priority);
 }
 
+int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
+{
+       unsigned long active;
+       unsigned long inactive;
+
+       inactive = mem_cgroup_get_all_zonestat(memcg, LRU_INACTIVE_ANON);
+       active = mem_cgroup_get_all_zonestat(memcg, LRU_ACTIVE_ANON);
+
+       if (inactive * memcg->inactive_ratio < active)
+               return 1;
+
+       return 0;
+}
+
 unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
                                        struct list_head *dst,
                                        unsigned long *scanned, int order,
@@ -1360,6 +1377,29 @@ int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask)
        return 0;
 }
 
+/*
+ * The inactive anon list should be small enough that the VM never has to
+ * do too much work, but large enough that each inactive page has a chance
+ * to be referenced again before it is swapped out.
+ *
+ * this calculation is straightforward porting from
+ * page_alloc.c::setup_per_zone_inactive_ratio().
+ * it describe more detail.
+ */
+static void mem_cgroup_set_inactive_ratio(struct mem_cgroup *memcg)
+{
+       unsigned int gb, ratio;
+
+       gb = res_counter_read_u64(&memcg->res, RES_LIMIT) >> 30;
+       if (gb)
+               ratio = int_sqrt(10 * gb);
+       else
+               ratio = 1;
+
+       memcg->inactive_ratio = ratio;
+
+}
+
 static DEFINE_MUTEX(set_limit_mutex);
 
 static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
@@ -1398,6 +1438,10 @@ static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
                                GFP_KERNEL, false);
                if (!progress)                  retry_count--;
        }
+
+       if (!ret)
+               mem_cgroup_set_inactive_ratio(memcg);
+
        return ret;
 }
 
@@ -1982,7 +2026,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
                res_counter_init(&mem->res, NULL);
                res_counter_init(&mem->memsw, NULL);
        }
-
+       mem_cgroup_set_inactive_ratio(mem);
        mem->last_scanned_child = NULL;
 
        return &mem->css;