linux-kernel - Re: [PATCH] memcg: provide reclaim stats via 'memory.reclaim'

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Message-ID: <YozFZI2euSjWPgDb@cmpxchg.org>
Date:   Tue, 24 May 2022 07:45:40 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Michal Hocko <mhocko@...e.com>,
        Vaibhav Jain <vaibhav@...ux.ibm.com>,
        Cgroups <cgroups@...r.kernel.org>, linux-doc@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Jonathan Corbet <corbet@....net>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH] memcg: provide reclaim stats via 'memory.reclaim'

On Mon, May 23, 2022 at 03:50:34PM -0700, Yosry Ahmed wrote:
> I think it might be useful to have a dedicated entry in memory.stat
> for proactively reclaimed memory. A case where this would be useful is
> tuning and evaluating userspace proactive reclaimers. For instance, if
> a userspace agent is asking the kernel to reclaim 100M, but it could
> only reclaim 10M, then most probably the proactive reclaimer is not
> using a good methodology to figure out how much memory do we need to
> reclaim.
> 
> IMO this is more useful, and a superset of just reading the last
> reclaim request status through memory.reclaim (read stat before and
> after).

+1