linux-kernel - Re: [GIT PULL] isolation: 1Hz residual tick offloading v3

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Date:   Tue, 16 Jan 2018 18:58:18 +0100
From:   Mike Galbraith <efault@....de>
To:     Frederic Weisbecker <frederic@...nel.org>,
        Luiz Capitulino <lcapitulino@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christoph Lameter <cl@...ux.com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Rik van Riel <riel@...hat.com>
Subject: Re: [GIT PULL] isolation: 1Hz residual tick offloading v3

On Tue, 2018-01-16 at 16:41 +0100, Frederic Weisbecker wrote:
> On Fri, Jan 12, 2018 at 02:18:13PM -0500, Luiz Capitulino wrote:
> 
> > Why are extending isolcpus= given that it's a deprecated interface?
> > Some people have already moved away from isolcpus= now, but with this
> > new feature they will be forced back to using it.
> 
> I tried to remove isolcpus or at least change the way it works so that its
> effects are reversible (ie: affine the init task instead of isolating domains)
> but that got nacked due to the behaviour's expectations for userspace.

So we paint ourselves into a static corner forever more, despite every
bit of this being all about "properties of sets of cpus", ie precisely
what cpusets was born to do.  That's sad, dynamic wasn't that far away.

	-Mike