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authorVladimir Davydov <vdavydov@parallels.com>2014-12-10 15:44:16 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-10 17:41:07 -0800
commit4ef461e8f4dd13a2e64c6c8f00c420d62294e2d4 (patch)
tree18137acb6cceb84855c370abb5555c830966bd55
parent97ad2be1daf8e6f2d297aa349101b340e1327917 (diff)
downloadop-kernel-dev-4ef461e8f4dd13a2e64c6c8f00c420d62294e2d4.zip
op-kernel-dev-4ef461e8f4dd13a2e64c6c8f00c420d62294e2d4.tar.gz
memcg: remove mem_cgroup_reclaimable check from soft reclaim
mem_cgroup_reclaimable() checks whether a cgroup has reclaimable pages on *any* NUMA node. However, the only place where it's called is mem_cgroup_soft_reclaim(), which tries to reclaim memory from a *specific* zone. So the way it is used is incorrect - it will return true even if the cgroup doesn't have pages on the zone we're scanning. I think we can get rid of this check completely, because mem_cgroup_shrink_node_zone(), which is called by mem_cgroup_soft_reclaim() if mem_cgroup_reclaimable() returns true, is equivalent to shrink_lruvec(), which exits almost immediately if the lruvec passed to it is empty. So there's no need to optimize anything here. Besides, we don't have such a check in the general scan path (shrink_zone) either. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/memcontrol.c43
1 files changed, 0 insertions, 43 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3734fd6..32e3b19 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1743,52 +1743,11 @@ int mem_cgroup_select_victim_node(struct mem_cgroup *memcg)
memcg->last_scanned_node = node;
return node;
}
-
-/*
- * Check all nodes whether it contains reclaimable pages or not.
- * For quick scan, we make use of scan_nodes. This will allow us to skip
- * unused nodes. But scan_nodes is lazily updated and may not cotain
- * enough new information. We need to do double check.
- */
-static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
-{
- int nid;
-
- /*
- * quick check...making use of scan_node.
- * We can skip unused nodes.
- */
- if (!nodes_empty(memcg->scan_nodes)) {
- for (nid = first_node(memcg->scan_nodes);
- nid < MAX_NUMNODES;
- nid = next_node(nid, memcg->scan_nodes)) {
-
- if (test_mem_cgroup_node_reclaimable(memcg, nid, noswap))
- return true;
- }
- }
- /*
- * Check rest of nodes.
- */
- for_each_node_state(nid, N_MEMORY) {
- if (node_isset(nid, memcg->scan_nodes))
- continue;
- if (test_mem_cgroup_node_reclaimable(memcg, nid, noswap))
- return true;
- }
- return false;
-}
-
#else
int mem_cgroup_select_victim_node(struct mem_cgroup *memcg)
{
return 0;
}
-
-static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
-{
- return test_mem_cgroup_node_reclaimable(memcg, 0, noswap);
-}
#endif
static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg,
@@ -1832,8 +1791,6 @@ static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg,
}
continue;
}
- if (!mem_cgroup_reclaimable(victim, false))
- continue;
total += mem_cgroup_shrink_node_zone(victim, gfp_mask, false,
zone, &nr_scanned);
*total_scanned += nr_scanned;
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