linux-kernel - Re: [PATCH v2 0/2] cgroup/cpuset: Make hotplug code more efficient

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Date:   Fri, 3 Feb 2023 12:07:23 +0000
From:   Will Deacon <will@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        kernel-team@...roid.com
Subject: Re: [PATCH v2 0/2] cgroup/cpuset: Make hotplug code more efficient

Hi Waiman,

On Thu, Feb 02, 2023 at 09:31:58AM -0500, Waiman Long wrote:
>  v2:
>   - It turns out it works around the v1 cpuset missing offline cpu
>     problem better than I originally thought. So the patch description
>     is updated accordingly.
> 
> This small patch series makes the cpuset hotplug a bit more efficient
> by eliminating unnecessary task iteration and cpu/node masks update
> when a cpu hotplug event (online/offline) happens.
> 
> It can also largely work around the known problem of missing previously
> offlined cpus in v1 cpuset with some exceptions.

I can't tell whether this is intended to address the issue I initially
reported at [1], so I gave it a spin anyway and it doesn't seem to help.

If it's unrelated, then sorry for the noise!

Will

[1] https://lore.kernel.org/r/20230117160825.GA17756@willie-the-truck