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In-Reply-To: <20231014160831.73785b15e9b34eb6146d5497@linux-foundation.org>
From:   Yosry Ahmed <yosryahmed@google.com>
Date:   Tue, 17 Oct 2023 16:52:06 -0700
Message-ID: <CAJD7tkZDarDn_38ntFg5bK2fAmFdSe+Rt6DKOZA7Sgs_kERoVA@mail.gmail.com>
Subject: Re: [PATCH v2 3/5] mm: memcg: make stats flushing threshold per-memcg
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Shakeel Butt <shakeelb@google.com>, michael@phoronix.com,
        Feng Tang <feng.tang@intel.com>,
        kernel test robot <oliver.sang@intel.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Muchun Song <muchun.song@linux.dev>,
        Ivan Babrou <ivan@cloudflare.com>, Tejun Heo <tj@kernel.org>,
        =?UTF-8?Q?Michal_Koutn=C3=BD?= <mkoutny@suse.com>,
        Waiman Long <longman@redhat.com>, kernel-team@cloudflare.com,
        Wei Xu <weixugc@google.com>, Greg Thelen <gthelen@google.com>,
        linux-mm@kvack.org, cgroups@vger.kernel.org,
        linux-kernel@vger.kernel.org
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On Sat, Oct 14, 2023 at 4:08=E2=80=AFPM Andrew Morton <akpm@linux-foundatio=
n.org> wrote:
>
> On Thu, 12 Oct 2023 15:23:06 -0700 Yosry Ahmed <yosryahmed@google.com> wr=
ote:
>
> > Meanwhile, Andrew, could you please replace the commit log of this
> > patch as follows for more updated testing info:
>
> Done.


Sorry Andrew, but could you please also take this fixlet?

From: Yosry Ahmed <yosryahmed@google.com>
Date: Tue, 17 Oct 2023 23:07:59 +0000
Subject: [PATCH] mm: memcg: clear percpu stats_pending during stats flush

When flushing memcg stats, we clear the per-memcg count of pending stat
updates, as they are captured by the flush. Also clear the percpu count
for the cpu being flushed.

Suggested-by: Wei Xu <weixugc@google.com>
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
---
 mm/memcontrol.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 0b1377b16b3e0..fa92de780ac89 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5653,6 +5653,7 @@ static void mem_cgroup_css_rstat_flush(struct
cgroup_subsys_state *css, int cpu)
                        }
                }
        }
+       statc->stats_updates =3D 0;
        /* We are in a per-cpu loop here, only do the atomic write once */
        if (atomic64_read(&memcg->vmstats->stats_updates))
                atomic64_set(&memcg->vmstats->stats_updates, 0);
--
2.42.0.655.g421f12c284-goog