linux-kernel - Re: [PATCH v4 1/1] mm: vmscan: Reduce throttling due to a failure to make progress

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Message-ID: <20220215144924.GS3366@techsingularity.net>
Date:   Tue, 15 Feb 2022 14:49:24 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Shuang Zhai <szhai2@...rochester.edu>
Cc:     akpm@...ux-foundation.org, djwong@...nel.org, efault@....de,
        hakavlad@...ox.lv, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, mhocko@...e.com,
        regressions@...ts.linux.dev, riel@...riel.com, vbabka@...e.cz
Subject: Re: [PATCH v4 1/1] mm: vmscan: Reduce throttling due to a failure to
 make progress

On Mon, Feb 14, 2022 at 04:10:50PM -0500, Shuang Zhai wrote:
> Hi Mel,
> 
> Mel Gorman wrote:
> >
> > Mike Galbraith, Alexey Avramov and Darrick Wong all reported similar
> > problems due to reclaim throttling for excessive lengths of time.
> > In Alexey's case, a memory hog that should go OOM quickly stalls for
> > several minutes before stalling. In Mike and Darrick's cases, a small
> > memcg environment stalled excessively even though the system had enough
> > memory overall.
> >
> 
> I recently found a regression when I tested MGLRU with fio on Linux
> 5.16-rc6 [1]. After this patch was applied, I re-ran the test with Linux
> 5.16, but the regression has not been fixed yet. 
> 

Am I correct in thinging that this only happens with MGLRU?

-- 
Mel Gorman
SUSE Labs