* [PATCH] mm: memcontrol: fix percpu vmstats and vmevents flush
@ 2019-08-29 20:31 Shakeel Butt
2019-08-29 20:40 ` Roman Gushchin
2019-08-30 5:49 ` Michal Hocko
0 siblings, 2 replies; 3+ messages in thread
From: Shakeel Butt @ 2019-08-29 20:31 UTC (permalink / raw)
To: Roman Gushchin
Cc: linux-mm, cgroups, linux-kernel, Shakeel Butt, Michal Hocko,
Johannes Weiner, Vladimir Davydov, Andrew Morton, stable
Instead of using raw_cpu_read() use per_cpu() to read the actual data of
the corresponding cpu otherwise we will be reading the data of the
current cpu for the number of online CPUs.
Fixes: bb65f89b7d3d ("mm: memcontrol: flush percpu vmevents before releasing memcg")
Fixes: c350a99ea2b1 ("mm: memcontrol: flush percpu vmstats before releasing memcg")
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: <stable@vger.kernel.org>
---
Note: The buggy patches were marked for stable therefore adding Cc to
stable.
mm/memcontrol.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 26e2999af608..f4e60ee8b845 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3271,7 +3271,7 @@ static void memcg_flush_percpu_vmstats(struct mem_cgroup *memcg)
for_each_online_cpu(cpu)
for (i = 0; i < MEMCG_NR_STAT; i++)
- stat[i] += raw_cpu_read(memcg->vmstats_percpu->stat[i]);
+ stat[i] += per_cpu(memcg->vmstats_percpu->stat[i], cpu);
for (mi = memcg; mi; mi = parent_mem_cgroup(mi))
for (i = 0; i < MEMCG_NR_STAT; i++)
@@ -3286,8 +3286,8 @@ static void memcg_flush_percpu_vmstats(struct mem_cgroup *memcg)
for_each_online_cpu(cpu)
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
- stat[i] += raw_cpu_read(
- pn->lruvec_stat_cpu->count[i]);
+ stat[i] += per_cpu(
+ pn->lruvec_stat_cpu->count[i], cpu);
for (pi = pn; pi; pi = parent_nodeinfo(pi, node))
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
@@ -3306,8 +3306,8 @@ static void memcg_flush_percpu_vmevents(struct mem_cgroup *memcg)
for_each_online_cpu(cpu)
for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
- events[i] += raw_cpu_read(
- memcg->vmstats_percpu->events[i]);
+ events[i] += per_cpu(memcg->vmstats_percpu->events[i],
+ cpu);
for (mi = memcg; mi; mi = parent_mem_cgroup(mi))
for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
--
2.23.0.187.g17f5b7556c-goog
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] mm: memcontrol: fix percpu vmstats and vmevents flush
2019-08-29 20:31 [PATCH] mm: memcontrol: fix percpu vmstats and vmevents flush Shakeel Butt
@ 2019-08-29 20:40 ` Roman Gushchin
2019-08-30 5:49 ` Michal Hocko
1 sibling, 0 replies; 3+ messages in thread
From: Roman Gushchin @ 2019-08-29 20:40 UTC (permalink / raw)
To: Shakeel Butt
Cc: linux-mm, cgroups, linux-kernel, Michal Hocko, Johannes Weiner,
Vladimir Davydov, Andrew Morton, stable
On Thu, Aug 29, 2019 at 01:31:10PM -0700, Shakeel Butt wrote:
> Instead of using raw_cpu_read() use per_cpu() to read the actual data of
> the corresponding cpu otherwise we will be reading the data of the
> current cpu for the number of online CPUs.
>
> Fixes: bb65f89b7d3d ("mm: memcontrol: flush percpu vmevents before releasing memcg")
> Fixes: c350a99ea2b1 ("mm: memcontrol: flush percpu vmstats before releasing memcg")
> Signed-off-by: Shakeel Butt <shakeelb@google.com>
> Cc: Roman Gushchin <guro@fb.com>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: <stable@vger.kernel.org>
Ouch, thanks Shakeel!
Acked-by: Roman Gushchin <guro@fb.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] mm: memcontrol: fix percpu vmstats and vmevents flush
2019-08-29 20:31 [PATCH] mm: memcontrol: fix percpu vmstats and vmevents flush Shakeel Butt
2019-08-29 20:40 ` Roman Gushchin
@ 2019-08-30 5:49 ` Michal Hocko
1 sibling, 0 replies; 3+ messages in thread
From: Michal Hocko @ 2019-08-30 5:49 UTC (permalink / raw)
To: Shakeel Butt
Cc: Roman Gushchin, linux-mm, cgroups, linux-kernel, Johannes Weiner,
Vladimir Davydov, Andrew Morton, stable
On Thu 29-08-19 13:31:10, Shakeel Butt wrote:
> Instead of using raw_cpu_read() use per_cpu() to read the actual data of
> the corresponding cpu otherwise we will be reading the data of the
> current cpu for the number of online CPUs.
>
> Fixes: bb65f89b7d3d ("mm: memcontrol: flush percpu vmevents before releasing memcg")
> Fixes: c350a99ea2b1 ("mm: memcontrol: flush percpu vmstats before releasing memcg")
> Signed-off-by: Shakeel Butt <shakeelb@google.com>
> Cc: Roman Gushchin <guro@fb.com>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: <stable@vger.kernel.org>
Ups, missed that when reviewing. Sorry about that.
Acked-by: Michal Hocko <mhocko@suse.com>
> ---
>
> Note: The buggy patches were marked for stable therefore adding Cc to
> stable.
>
> mm/memcontrol.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 26e2999af608..f4e60ee8b845 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3271,7 +3271,7 @@ static void memcg_flush_percpu_vmstats(struct mem_cgroup *memcg)
>
> for_each_online_cpu(cpu)
> for (i = 0; i < MEMCG_NR_STAT; i++)
> - stat[i] += raw_cpu_read(memcg->vmstats_percpu->stat[i]);
> + stat[i] += per_cpu(memcg->vmstats_percpu->stat[i], cpu);
>
> for (mi = memcg; mi; mi = parent_mem_cgroup(mi))
> for (i = 0; i < MEMCG_NR_STAT; i++)
> @@ -3286,8 +3286,8 @@ static void memcg_flush_percpu_vmstats(struct mem_cgroup *memcg)
>
> for_each_online_cpu(cpu)
> for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
> - stat[i] += raw_cpu_read(
> - pn->lruvec_stat_cpu->count[i]);
> + stat[i] += per_cpu(
> + pn->lruvec_stat_cpu->count[i], cpu);
>
> for (pi = pn; pi; pi = parent_nodeinfo(pi, node))
> for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
> @@ -3306,8 +3306,8 @@ static void memcg_flush_percpu_vmevents(struct mem_cgroup *memcg)
>
> for_each_online_cpu(cpu)
> for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
> - events[i] += raw_cpu_read(
> - memcg->vmstats_percpu->events[i]);
> + events[i] += per_cpu(memcg->vmstats_percpu->events[i],
> + cpu);
>
> for (mi = memcg; mi; mi = parent_mem_cgroup(mi))
> for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
> --
> 2.23.0.187.g17f5b7556c-goog
>
--
Michal Hocko
SUSE Labs
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-08-29 20:31 [PATCH] mm: memcontrol: fix percpu vmstats and vmevents flush Shakeel Butt
2019-08-29 20:40 ` Roman Gushchin
2019-08-30 5:49 ` Michal Hocko
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