Re: Bulk CPU Hotplug (Was Re: [PATCH] Do not force shutdown/rebootto boot cpu.)

From: Ingo Molnar
Date: Fri Apr 12 2013 - 01:37:27 EST

* Robin Holt <holt@xxxxxxx> wrote:

> For the v3.9 release, can we consider my awful patch?

How about trying what I suggested, to make reboot affine to the boot CPU
explicitly, not by shutting down all the other CPUs, but by set_cpus_allowed() or

That should solve the regression, without the ugly special-casing - while giving
time to address the hot-unplug performance bottleneck.

Once that is done disable_nonboot_cpus() can be used again for reboot.

(But no strong feelings either way - both solutions are a workaround in a sense.)


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