linux-kernel - Re: [PATCH] cpuset: Make cpuset hotplug synchronous

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Message-ID: <20200212213248.GE14897@hirez.programming.kicks-ass.net>
Date:   Wed, 12 Feb 2020 22:32:48 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Prateek Sood <prsood@...eaurora.org>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpuset: Make cpuset hotplug synchronous

On Wed, Feb 12, 2020 at 04:18:32PM -0500, Tejun Heo wrote:
> On Sat, Feb 01, 2020 at 08:33:34AM +0530, Prateek Sood wrote:
> > Hi Tejun & Peter,
> > 
> > Could you please share your feedback on this patch for making
> > 
> > cpuset_hotplug_workfn synchronous.
> 
> Hey, IIRC, we went back forth with this several times. Unless there's
> a pressing reason to change, I'd rather leave it alone.

I think I have a similar patch in one of the many in-progress series I
keep around; IIRC it is the one where I add per-cpu support to
SCHED_DEADLINE. The hotplug accounting becomes easier if we do this.

Sadly this series is fairly low on the todo list atm though :/ I have no
problems keeping it around until such a time though.