linux-kernel - Re: [PATCH 4/5] sched/isolation: Residual 1Hz scheduler tick offload

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Message-ID: <alpine.DEB.2.20.1712191002480.16727@nuc-kabylake>
Date:   Tue, 19 Dec 2017 10:03:37 -0600 (CST)
From:   Christopher Lameter <cl@...ux.com>
To:     Frederic Weisbecker <frederic@...nel.org>
cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.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>,
        Wanpeng Li <kernellwp@...il.com>,
        Mike Galbraith <efault@....de>, Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 4/5] sched/isolation: Residual 1Hz scheduler tick
 offload

On Tue, 19 Dec 2017, Frederic Weisbecker wrote:

> Adding the boot parameter "isolcpus=nohz_offload" will now outsource
> these scheduler ticks to the global workqueue so that a housekeeping CPU
> handles that tick remotely.

The vmstat processing required per cpu area access. How does that work if
the code is running on a remote processor?