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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2009-01-07 18:08:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:08 -0800
commit14797e2363c2b2f1ce139fd1c5a215e4e05aa1d9 (patch)
treea56edaa680c7c338a5a3043aa24897d7f668b6c9 /mm/memcontrol.c
parent549927620b04a8f8073ce2ee2a8977f209af2ee5 (diff)
memcg: add inactive_anon_is_low()
The inactive_anon_is_low() is key component of active/inactive anon balancing on reclaim. However current inactive_anon_is_low() function only consider global reclaim. Therefore, we need following ugly scan_global_lru() condition. if (lru == LRU_ACTIVE_ANON && (!scan_global_lru(sc) || inactive_anon_is_low(zone))) { shrink_active_list(nr_to_scan, zone, sc, priority, file); return 0; it cause that memcg reclaim always deactivate pages when shrink_list() is called. To make mem_cgroup_inactive_anon_is_low() improve active/inactive anon balancing of memcgroup. Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: "Pekka Enberg" <penberg@cs.helsinki.fi> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Hugh Dickins <hugh@veritas.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 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.c46
1 files changed, 45 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 457d671029b..6611328460e 100644
--- 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;