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Date:   Fri, 1 Oct 2021 10:29:13 -0400
From:   Johannes Weiner <hannes@cmpxchg.org>
To:     Shakeel Butt <shakeelb@google.com>
Cc:     Michal Hocko <mhocko@kernel.org>,
        Michal =?iso-8859-1?Q?Koutn=FD?= <mkoutny@suse.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        cgroups@vger.kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] memcg: unify memcg stat flushing
Message-ID: <YVcbOZTQOTAKXzol@cmpxchg.org>
References: <20210930044711.2892660-1-shakeelb@google.com>
 <20210930044711.2892660-2-shakeelb@google.com>
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On Wed, Sep 29, 2021 at 09:47:11PM -0700, Shakeel Butt wrote:
> The memcg stats can be flushed in multiple context and potentially in
> parallel too. For example multiple parallel user space readers for memcg
> stats will contend on the rstat locks with each other. There is no need
> for that. We just need one flusher and everyone else can benefit. In
> addition after aa48e47e3906 ("memcg: infrastructure to flush memcg
> stats") the kernel periodically flush the memcg stats from the root, so,
> the other flushers will potentially have much less work to do.
> 
> Signed-off-by: Shakeel Butt <shakeelb@google.com>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>