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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'
Date: Wed, 23 Feb 2022 12:50:02 +0000	[thread overview]
Message-ID: <20220223125002.GE4423@techsingularity.net> (raw)
In-Reply-To: <20220222172731.31949-1-szhai2@cs.rochester.edu>

On Tue, Feb 22, 2022 at 12:27:31PM -0500, Shuang Zhai wrote:
> Mel Gorman wrote:
> > 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?
> 
> Sorry about the confusion and let me clarify on this. The regression happens
> on upstream Linux with the default page replacement mechanism.

Ok, the fio command for me simply exits with an error and even if it didn't
the test machine I have with persistent memory does not have enough pmem
to trigger memory reclaim issues with fio. Can you do the following please?

# echo 1 > vmscan/mm_vmscan_throttled/enable
# cat /sys/kernel/debug/tracing/trace_pipe > trace.out

and run the test? Compress trace.out with xz and send it to me by mail.
If the trace is too large, send as much as you can.

-- 
Mel Gorman
SUSE Labs

      reply	other threads:[~2022-02-23 12:50 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-02 15:06 [PATCH v4 1/1] mm: vmscan: Reduce throttling due to a failure to make progress Mel Gorman
2021-12-02 16:30 ` Shakeel Butt
2021-12-02 16:52   ` Mel Gorman
2021-12-02 17:41     ` Shakeel Butt
2021-12-03  9:01       ` Mel Gorman
2021-12-03 17:50         ` Shakeel Butt
2021-12-03 19:08           ` Mel Gorman
2021-12-06  6:06             ` Shakeel Butt
2021-12-06 11:25               ` Mel Gorman
2021-12-07  7:14                 ` Shakeel Butt
2021-12-07  9:28                   ` Mel Gorman
2021-12-09  6:20 ` Hugh Dickins
2021-12-09  9:53   ` Mel Gorman
2021-12-28 10:04 ` Thorsten Leemhuis
2021-12-29 23:45   ` Andrew Morton
2021-12-31 14:24     ` Thorsten Leemhuis
2021-12-31 18:33       ` Hugh Dickins
2021-12-31 19:14       ` Linus Torvalds
2021-12-31 19:21         ` Linus Torvalds
2021-12-31 19:22           ` Linus Torvalds
2022-01-01 10:52             ` Thorsten Leemhuis
2021-12-31 21:04           ` Andrew Morton
2021-12-31 21:18             ` Linus Torvalds
2022-02-14 21:10 ` Shuang Zhai
2022-02-15 14:49   ` Mel Gorman
2022-02-22 17:27     ` [PATCH v4 1/1] mm: vmscan: Reduce throttling due to a failure to make progress' Shuang Zhai
2022-02-23 12:50       ` Mel Gorman [this message]

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