linux-kernel - Re: [PATCH] cgroup: rstat: optimize flush through speculative test

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Message-ID: <CALvZod6fwur--Q6Kh6GSPRR_16DQdrNDyuZgYjgncDpPUENWVg@mail.gmail.com>
Date:   Mon, 4 Oct 2021 11:35:12 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Koutný <mkoutny@...e.com>,
        Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cgroup: rstat: optimize flush through speculative test

On Mon, Oct 4, 2021 at 11:21 AM Tejun Heo <tj@...nel.org> wrote:
>
>
[...]
> What do you think about that approach? While the proposed patch looks fine,
> it kinda bothers me that it's a very partial optimization - ie. if flush
> frequency is high enough for this to matter, that for_each_possible_cpu()
> scanning loop really isn't appropriate.
>

Makes sense. I will take a stab at that.