LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Qais Yousef <qais.yousef@arm.com>
To: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	cgroups@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cgroup/cpuset: Fix a race condition when reading cpuset.*
Date: Thu, 13 Feb 2020 14:36:40 +0000
Message-ID: <20200213143639.6jw2kiadjzyu6unr@e107158-lin.cambridge.arm.com> (raw)
In-Reply-To: <20200213135645.GG88887@mtj.thefacebook.com>

On 02/13/20 08:56, Tejun Heo wrote:
> Hello,
> 
> On Thu, Feb 13, 2020 at 11:50:16AM +0000, Qais Yousef wrote:
> > I ran 500 iterations of cpuset_hotplug_test.sh on the branch, it passed.
> > 
> > I also cherry-picked commit 6426bfb1d5f0 ("cpuset: Make cpuset hotplug synchronous")
> > into v5.6-rc1 and ran 100 iterations and it passed too.
> 
> Awesome, thanks for verifying.
> 
> > While investigating the problem, I could reproduce it all the way back to v5.0.
> > Stopped there so earlier versions could still have the problem.
> > 
> > Do you think it's worth porting the change to stable trees? Admittedly the
> > problem should be benign, but it did trigger an LTP failure.
> 
> I'm afraid not. It's not an issue which would affect actual use cases
> and there's (as always) some risks involved with backporting it, so
> the benefit just doesn't seem justifiable here.

Yeah I can't see how a real application would depend on this functionality
other than for informational reasons. Or testing like in this case.

Thanks

--
Qais Yousef

      reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-11 14:15 Qais Yousef
2020-02-12 22:15 ` Tejun Heo
2020-02-13 11:50   ` Qais Yousef
2020-02-13 13:56     ` Tejun Heo
2020-02-13 14:36       ` Qais Yousef [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=20200213143639.6jw2kiadjzyu6unr@e107158-lin.cambridge.arm.com \
    --to=qais.yousef@arm.com \
    --cc=cgroups@vger.kernel.org \
    --cc=hannes@cmpxchg.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lizefan@huawei.com \
    --cc=tj@kernel.org \
    /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

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git