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Date:   Tue, 15 Feb 2022 14:49:24 +0000
From:   Mel Gorman <mgorman@techsingularity.net>
To:     Shuang Zhai <szhai2@cs.rochester.edu>
Cc:     akpm@linux-foundation.org, djwong@kernel.org, efault@gmx.de,
        hakavlad@inbox.lv, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.com,
        regressions@lists.linux.dev, riel@surriel.com, vbabka@suse.cz
Subject: Re: [PATCH v4 1/1] mm: vmscan: Reduce throttling due to a failure to
 make progress
Message-ID: <20220215144924.GS3366@techsingularity.net>
References: <20211202150614.22440-1-mgorman@techsingularity.net>
 <20220214211050.31049-1-szhai2@cs.rochester.edu>
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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