linux-kernel - Re: [RFC PATCH 12/12] housekeeping: Reimplement isolcpus on housekeeping

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Message-ID: <alpine.DEB.2.20.1708281151410.803@nuc-kabylake>
Date:   Mon, 28 Aug 2017 11:53:46 -0500 (CDT)
From:   Christopher Lameter <cl@...ux.com>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     Frederic Weisbecker <fweisbec@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Luiz Capitulino <lcapitulino@...hat.com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Ingo Molnar <mingo@...nel.org>, Mike Galbraith <efault@....de>,
        Rik van Riel <riel@...hat.com>,
        Wanpeng Li <kernellwp@...il.com>
Subject: Re: [RFC PATCH 12/12] housekeeping: Reimplement isolcpus on
 housekeeping

On Mon, 28 Aug 2017, Peter Zijlstra wrote:

> Well, ideally something like this would start the system with all the
> 'crap' threads in !root cgroup. But that means cgroupfs needs to be
> populated with at least two directories on boot. And current cgroup
> cruft doesn't expect that.

Maybe an affinity mask for bootup will take care of that? I once wrote an
init wrapper that restricted the number of cpus for the threads that init
spawns but we can probably do much better.