On Sat, Jun 03, 2017 at 08:50:02PM +0300, Vladimir Davydov wrote:
> On Tue, May 30, 2017 at 02:17:23PM -0400, Johannes Weiner wrote:
> > lruvecs are at the intersection of the NUMA node and memcg, which is
> > the scope for most paging activity.
> >
> > Introduce a convenient accounting infrastructure that maintains
> > statistics per node, per memcg, and the lruvec itself.
> >
> > Then convert over accounting sites for statistics that are already
> > tracked in both nodes and memcgs and can be easily switched.
> >
> > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> > ---
> > include/linux/memcontrol.h | 238 +++++++++++++++++++++++++++++++++++++++------
> > include/linux/vmstat.h | 1 -
> > mm/memcontrol.c | 6 ++
> > mm/page-writeback.c | 15 +--
> > mm/rmap.c | 8 +-
> > mm/workingset.c | 9 +-
> > 6 files changed, 225 insertions(+), 52 deletions(-)
> >
> ...
> > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> > index 9c68a40c83e3..e37908606c0f 100644
> > --- a/mm/memcontrol.c
> > +++ b/mm/memcontrol.c
> > @@ -4122,6 +4122,12 @@ static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
> > if (!pn)
> > return 1;
> >
> > + pn->lruvec_stat = alloc_percpu(struct lruvec_stat);
> > + if (!pn->lruvec_stat) {
> > + kfree(pn);
> > + return 1;
> > + }
> > +
> > lruvec_init(&pn->lruvec);
> > pn->usage_in_excess = 0;
> > pn->on_tree = false;
>
> I don't see the matching free_percpu() anywhere, forget to patch
> free_mem_cgroup_per_node_info()?
Yes, I missed that.
---
>From 4d09a522a2182acae4e36ded4211d05defd75b74 Mon Sep 17 00:00:00 2001
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Date: Mon, 5 Jun 2017 10:59:41 -0400
Subject: [PATCH] mm: memcontrol: per-lruvec stats infrastructure fix 3
As pointed out, there is a missing free_percpu() for the lruvec_stat
object in the memcg's per node info. Add this.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
mm/memcontrol.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e37908606c0f..093fe7e06e51 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4139,7 +4139,10 @@ static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
static void free_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
{
- kfree(memcg->nodeinfo[node]);
+ struct mem_cgroup_per_node *pn = memcg->nodeinfo[node];
+
+ free_percpu(pn->lruvec_stat);
+ kfree(pn);
}
static void __mem_cgroup_free(struct mem_cgroup *memcg)
--
2.13.0
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