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Date: Wed, 29 Dec 2021 15:45:53 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: Mel Gorman <mgorman@techsingularity.net>, Mark Brown
 <broonie@kernel.org>, Michal Hocko <mhocko@suse.com>, Vlastimil Babka
 <vbabka@suse.cz>, Alexey Avramov <hakavlad@inbox.lv>, Rik van Riel
 <riel@surriel.com>, Mike Galbraith <efault@gmx.de>, Darrick Wong
 <djwong@kernel.org>, regressions@lists.linux.dev, Linux-fsdevel
 <linux-fsdevel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>, LKML
 <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 1/1] mm: vmscan: Reduce throttling due to a failure
 to make progress
Message-Id: <20211229154553.09dd5bb657bc19d45c3de8dd@linux-foundation.org>
In-Reply-To: <caf247ab-f6fe-a3b9-c4b5-7ce17d1d5e43@leemhuis.info>
References: <20211202150614.22440-1-mgorman@techsingularity.net>
	<caf247ab-f6fe-a3b9-c4b5-7ce17d1d5e43@leemhuis.info>
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On Tue, 28 Dec 2021 11:04:18 +0100 Thorsten Leemhuis <regressions@leemhuis.info> wrote:

> Hi, this is your Linux kernel regression tracker speaking.
> 
> On 02.12.21 16:06, 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.
> 
> Just wondering: this patch afaics is now in -mm and  Linux next for
> nearly two weeks. Is that intentional? I had expected it to be mainlined
> with the batch of patches Andrew mailed to Linus last week, but it
> wasn't among them.

I have it queued for 5.17-rc1.

There is still time to squeeze it into 5.16, just, with a cc:stable. 

Alternatively we could merge it into 5.17-rc1 with a cc:stable, so it
will trickle back with less risk to the 5.17 release.

What do people think?