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

From: Frederic Weisbecker
Date: Mon Aug 24 2015 - 09:36:12 EST

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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