linux-kernel - Re: [PATCH] memcg: introduce per-memcg reclaim interface

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Message-ID: <20200922183125.GG12990@dhcp22.suse.cz>
Date:   Tue, 22 Sep 2020 20:31:25 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Minchan Kim <minchan@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <guro@...com>, Greg Thelen <gthelen@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Michal Koutný <mkoutny@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Yang Shi <shy828301@...il.com>
Subject: Re: [PATCH] memcg: introduce per-memcg reclaim interface

On Tue 22-09-20 11:10:17, Shakeel Butt wrote:
> On Tue, Sep 22, 2020 at 9:55 AM Michal Hocko <mhocko@...e.com> wrote:
[...]
> > So far I have learned that you are primarily working around an
> > implementation detail in the zswap which is doing the swapout path
> > directly in the pageout path.
> 
> Wait how did you reach this conclusion? I have explicitly said that we
> are not using uswapd like functionality in production. We are using
> this interface for proactive reclaim and proactive reclaim is not a
> workaround for implementation detail in the zswap.

Hmm, I must have missed the distinction between the two you have
mentioned. Correct me if I am wrong but "latency sensitive" workload is
the one that cannot use the high limit, right. For some reason I thought
that your pro-active reclaim usecase is also not compatible with the
throttling imposed by the high limit. Hence my conclusion above.
-- 
Michal Hocko
SUSE Labs