linux-kernel - Re: [PATCH V2] cpuset: Add knob to make allowed masks hotplug invariant on legacy hierarchy

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Message-ID: <20150413150515.GV21418@twins.programming.kicks-ass.net>
Date:	Mon, 13 Apr 2015 17:05:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	svaidy@...ux.vnet.ibm.com, nacc@...ux.vnet.ibm.com,
	rjw@...ysocki.net, linux-kernel@...r.kernel.org,
	lizefan@...wei.com, anton@...ba.org, bharata@...ux.vnet.ibm.com,
	cgroups@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	mingo@...nel.org, serge@...lyn.com
Subject: Re: [PATCH V2] cpuset: Add knob to make allowed masks hotplug
 invariant on legacy hierarchy

On Mon, Apr 13, 2015 at 10:50:52AM -0400, Tejun Heo wrote:
> On Fri, Apr 10, 2015 at 07:41:52PM +0530, Preeti U Murthy wrote:
> > Moreover the default hierarchy keeps the allowed masks hotplug invariant
> > too. So the patch is not bringing about a fundamental change in the
> > design of cgroups.
> 
> This is gonna be a new behavior anyway and I don't follow why you just
> can't use the default hierarchy (well, of course except for that it
> isn't ready yet but no matter what we do this is gonna take another
> devel cycle so what's the difference?).  It's not like the default
> hierarchy requires invasive changes.  I'm not convinced this calls for
> yet another operation mode.

So TJ and me don't often seem to agree on cgroup stuffs, but here we do
;-)
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