linux-kernel - Re: [PATCH] mm: vmscan: consistent update to pgrefill

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Message-ID: <20200711023151.GA388137@carbon.lan>
Date:   Fri, 10 Jul 2020 19:31:51 -0700
From:   Roman Gushchin <guro@...com>
To:     Shakeel Butt <shakeelb@...gle.com>
CC:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Yafang Shao <laoar.shao@...il.com>,
        Chris Down <chris@...isdown.name>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: vmscan: consistent update to pgrefill

On Fri, Jul 10, 2020 at 06:14:59PM -0700, Shakeel Butt wrote:
> The vmstat pgrefill is useful together with pgscan and pgsteal stats to
> measure the reclaim efficiency. However vmstat's pgrefill is not updated
> consistently at system level. It gets updated for both global and memcg
> reclaim however pgscan and pgsteal are updated for only global reclaim.
> So, update pgrefill only for global reclaim. If someone is interested in
> the stats representing both system level as well as memcg level reclaim,
> then consult the root memcg's memory.stat instead of /proc/vmstat.
> 
> Signed-off-by: Shakeel Butt <shakeelb@...gle.com>

So you went into the opposite direction from the "previous version"
( https://lkml.org/lkml/2020/5/7/1464 ) ?

Acked-by: Roman Gushchin <guro@...com>

Thanks!