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

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Message-ID: <20150824133559.GA27147@lerouge>
Date:	Mon, 24 Aug 2015 15:36:01 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"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, 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.

> 
> Thanks,
> 
> 	Ingo
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