linux-kernel - Re: [PATCH] cgroup/cpuset: Fix a race condition when reading cpuset.*

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Message-ID: <20200213143639.6jw2kiadjzyu6unr@e107158-lin.cambridge.arm.com>
Date:   Thu, 13 Feb 2020 14:36:40 +0000
From:   Qais Yousef <qais.yousef@....com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cgroup/cpuset: Fix a race condition when reading cpuset.*

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