linux-kernel - Re: [PATCH v1 9/9] memcg: do not modify rstat tree for zero updates

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Message-ID: <CALvZod4boccrKxrCm9aDBCupror1zC0J3spHeidSiAZgei_r9Q@mail.gmail.com>
Date:   Tue, 28 Mar 2023 08:20:15 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Tejun Heo <tj@...nel.org>, Josef Bacik <josef@...icpanda.com>,
        Jens Axboe <axboe@...nel.dk>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Koutný <mkoutny@...e.com>,
        Vasily Averin <vasily.averin@...ux.dev>,
        cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v1 9/9] memcg: do not modify rstat tree for zero updates

On Mon, Mar 27, 2023 at 11:17 PM Yosry Ahmed <yosryahmed@...gle.com> wrote:
>
> In some situations, we may end up calling memcg_rstat_updated() with a
> value of 0, which means the stat was not actually updated. An example is
> if we fail to reclaim any pages in shrink_folio_list().
>
> Do not add the cgroup to the rstat updated tree in this case, to avoid
> unnecessarily flushing it.
>
> Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>

Acked-by: Shakeel Butt <shakeelb@...gle.com>