[RFC][PATCH 5/7] memcg : export select victim memcg

[KAMEZAWA Hiroyuki]

Later change will call mem_cgroup_select_victim() from vmscan.c
to do hierarchical reclaim. Need to export an interface and add
release_victim().

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
 include/linux/memcontrol.h |    2 ++
 mm/memcontrol.c            |   13 +++++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

Index: mmotm-May6/mm/memcontrol.c
===================================================================
--- mmotm-May6.orig/mm/memcontrol.c
+++ mmotm-May6/mm/memcontrol.c
@@ -1555,6 +1555,11 @@ mem_cgroup_select_victim(struct mem_cgro
 	return ret;
 }
 
+void mem_cgroup_release_victim(struct mem_cgroup *mem)
+{
+	css_put(&mem->css);
+}
+
 #if MAX_NUMNODES > 1
 
 /*
@@ -1699,7 +1704,7 @@ static int mem_cgroup_hierarchical_recla
 				 * no reclaimable pages under this hierarchy
 				 */
 				if (!check_soft || !total) {
-					css_put(&victim->css);
+					mem_cgroup_release_victim(victim);
 					break;
 				}
 				/*
@@ -1710,14 +1715,14 @@ static int mem_cgroup_hierarchical_recla
 				 */
 				if (total >= (excess >> 2) ||
 					(loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) {
-					css_put(&victim->css);
+					mem_cgroup_release_victim(victim);
 					break;
 				}
 			}
 		}
 		if (!mem_cgroup_local_usage(victim)) {
 			/* this cgroup's local usage == 0 */
-			css_put(&victim->css);
+			mem_cgroup_release_victim(victim);
 			continue;
 		}
 		/* we use swappiness of local cgroup */
@@ -1730,7 +1735,7 @@ static int mem_cgroup_hierarchical_recla
 		} else
 			ret = try_to_free_mem_cgroup_pages(victim, gfp_mask,
 					noswap);
-		css_put(&victim->css);
+		mem_cgroup_release_victim(victim);
 		/*
 		 * At shrinking usage, we can't check we should stop here or
 		 * reclaim more. It's depends on callers. last_scanned_child
Index: mmotm-May6/include/linux/memcontrol.h
===================================================================
--- mmotm-May6.orig/include/linux/memcontrol.h
+++ mmotm-May6/include/linux/memcontrol.h
@@ -122,6 +122,8 @@ struct zone_reclaim_stat*
 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 					struct task_struct *p);
+struct mem_cgroup *mem_cgroup_select_victim(struct mem_cgroup *mem);
+void mem_cgroup_release_victim(struct mem_cgroup *mem);
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 extern int do_swap_account;
 #endif

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