Hi all
For easy review, it is re-prepared based on 3.3-rc1.
Thanks
Hillf
===cut please===
From: Hillf Danton <dhillf@xxxxxxxxx>
Subject: [PATCH] mm: vmscan: ensure reclaiming pages on the lru lists of zone
While iterating over memory cgroup hierarchy, pages are reclaimed from each
mem cgroup, and reclaim terminates after a full round-trip. It is possible
that no pages on the lru lists of given zone are reclaimed, as termination
is checked after the reclaiming function.
Mem cgroup iteration is rearranged a bit to make sure that pages are reclaimed
from both mem cgroups and zone.
Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---
--- a/mm/vmscan.c Mon Jan 23 00:23:10 2012
+++ b/mm/vmscan.c Mon Jan 23 00:26:44 2012
@@ -2142,14 +2142,14 @@ static void shrink_zone(int priority, st
.zone = zone,
.priority = priority,
};
- struct mem_cgroup *memcg;
+ struct mem_cgroup_zone mz = {
+ .zone = zone,
+ };
+ struct mem_cgroup *memcg = NULL;
- memcg = mem_cgroup_iter(root, NULL, &reclaim);
do {
- struct mem_cgroup_zone mz = {
- .mem_cgroup = memcg,
- .zone = zone,
- };
+ memcg = mem_cgroup_iter(root, memcg, &reclaim);
+ mz.mem_cgroup = memcg;
shrink_mem_cgroup_zone(priority, &mz, sc);
/*
@@ -2166,7 +2166,6 @@ static void shrink_zone(int priority, st
mem_cgroup_iter_break(root, memcg);
break;
}
- memcg = mem_cgroup_iter(root, memcg, &reclaim);
} while (memcg);
}
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