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Subject[RFC][PATCH 4/7] memcg : test a memcg is reclaimable

A function for checking that a memcg has reclaimable pages. This makes
use of mem->scan_nodes when CONFIG_NUMA=y.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
include/linux/memcontrol.h | 1 +
mm/memcontrol.c | 19 +++++++++++++++++++
2 files changed, 20 insertions(+)
Index: mmotm-May6/mm/memcontrol.c
===================================================================
--- mmotm-May6.orig/mm/memcontrol.c
+++ mmotm-May6/mm/memcontrol.c
@@ -1623,11 +1623,30 @@ int mem_cgroup_select_victim_node(struct
return node;
}

+bool mem_cgroup_test_reclaimable(struct mem_cgroup *memcg)
+{
+ mem_cgroup_may_update_nodemask(memcg);
+ return !nodes_empty(memcg->scan_nodes);
+}
+
#else
int mem_cgroup_select_victim_node(struct mem_cgroup *mem)
{
return 0;
}
+
+bool mem_cgroup_test_reclaimable(struct mem_cgroup *memcg)
+{
+ unsigned long nr;
+ int zid;
+
+ for (zid = NODE_DATA(0)->nr_zones - 1; zid >= 0; zid--)
+ if (mem_cgroup_zone_reclaimable_pages(memcg, 0, zid))
+ break;
+ if (zid < 0)
+ return false;
+ return true;
+}
#endif

/*
Index: mmotm-May6/include/linux/memcontrol.h
===================================================================
--- mmotm-May6.orig/include/linux/memcontrol.h
+++ mmotm-May6/include/linux/memcontrol.h
@@ -110,6 +110,7 @@ int mem_cgroup_inactive_anon_is_low(stru
int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
unsigned long
mem_cgroup_zone_reclaimable_pages(struct mem_cgroup *memcg, int nid, int zid);
+bool mem_cgroup_test_reclaimable(struct mem_cgroup *memcg);
int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
unsigned int mem_cgroup_swappiness(struct mem_cgroup *memcg);
unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,


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