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From: Frederic Weisbecker <fweisbec@gmail.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Vatika Harlalka <vatikaharlalka@gmail.com>,
	Chris Metcalf <cmetcalf@ezchip.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Preeti U Murthy <preeti@linux.vnet.ibm.com>,
	Christoph Lameter <cl@linux.com>
Subject: Re: [PATCH RESEND] sched/nohz: Affine unpinned timers to housekeepers
Date: Mon, 24 Aug 2015 15:36:01 +0200	[thread overview]
Message-ID: <20150824133559.GA27147@lerouge> (raw)
In-Reply-To: <20150824064412.GA11581@gmail.com>

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

  parent reply	other threads:[~2015-08-24 13:36 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-14  1:46 [PATCH RESEND] sched/nohz: Affine unpinned timers to housekeepers Frederic Weisbecker
2015-08-22 21:09 ` Ping: " Frederic Weisbecker
2015-08-23  1:22   ` Christoph Lameter
2015-08-23  5:40 ` Ingo Molnar
2015-08-23 16:01   ` Paul E. McKenney
2015-08-24  1:28     ` Frederic Weisbecker
2015-08-24  6:44     ` Ingo Molnar
2015-08-24  7:23       ` Mike Galbraith
2015-08-24  7:41         ` Ingo Molnar
2015-08-24  7:54           ` Mike Galbraith
2015-08-24  8:00             ` Ingo Molnar
2015-08-24 13:36       ` Frederic Weisbecker [this message]
2015-08-24 14:01         ` Mike Galbraith
2015-08-25  8:29         ` Ingo Molnar
2015-08-25 13:45           ` Frederic Weisbecker
2015-08-28  8:32             ` Ingo Molnar
2015-08-28 12:30               ` Frederic Weisbecker
2015-08-24 13:50       ` Paul E. McKenney
2015-08-24 14:04         ` Frederic Weisbecker
2015-08-24 15:45           ` Paul E. McKenney
2015-08-24  1:45   ` Frederic Weisbecker

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