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Subject[RFC][PATCH 5/7] memcg : export select victim memcg
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@jp.fujitsu.com>
---
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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