All of lore.kernel.org
 help / color / mirror / Atom feed
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 12:56 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]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20220223125002.GE4423@techsingularity.net \
    --to=mgorman@techsingularity.net \
    --cc=akpm@linux-foundation.org \
    --cc=djwong@kernel.org \
    --cc=efault@gmx.de \
    --cc=hakavlad@inbox.lv \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mhocko@suse.com \
    --cc=regressions@lists.linux.dev \
    --cc=riel@surriel.com \
    --cc=szhai2@cs.rochester.edu \
    --cc=vbabka@suse.cz \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.