linux-kernel - Re: [PATCH RESEND] sched/nohz: Affine unpinned timers to housekeepers

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Message-ID: <1440424879.3670.42.camel@gmail.com>
Date:	Mon, 24 Aug 2015 16:01:19 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Vatika Harlalka <vatikaharlalka@...il.com>,
	Chris Metcalf <cmetcalf@...hip.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH RESEND] sched/nohz: Affine unpinned timers to
 housekeepers

On Mon, 2015-08-24 at 15:36 +0200, Frederic Weisbecker wrote:
> On Mon, Aug 24, 2015 at 08:44:12AM +0200, Ingo Molnar wrote:
> > 2)
> > 
> > What happens if the boot CPU is offlined? (under CONFIG_BOOTPARAM_HOTPLUG_CPU0=y)
> > 
> > I don't see CPU hotplug callbacks fixing up the housekeeping_mask if the boot CPU 
> > is offlined.
> 
> We have tick_nohz_cpu_down_callback() which makes sure that the timekeeper, which
> is the boot CPU in nohz full, never gets offlined.

Aha.. and it works fine too.  (CPU0 told me to go away earlier;)

	-Mike

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