linux-kernel - Re: [Patch -v3 1/4] Migrate shutdown/reboot to boot cpu.

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Date:	Tue, 16 Apr 2013 11:02:27 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Robin Holt <holt@....com>
Cc:	Ingo Molnar <mingo@...hat.com>, Russ Anderson <rja@....com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michel Lespinasse <walken@...gle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Patch -v3 1/4] Migrate shutdown/reboot to boot cpu.

On Mon, Apr 15, 2013 at 12:14:29PM -0500, Robin Holt wrote:
> We recently noticed that reboot of a 1024 cpu machine takes approx 16
> minutes of just stopping the cpus.  The slowdown was tracked to commit
> f96972f.
>
> The current implementation does all the work of hot removing the cpus
> before halting the system.  We are switching to just migrating to the
> boot cpu and then continuing with shutdown/reboot.
>
> This also has the effect of not breaking x86's command line parameter for
> specifying the reboot cpu.  Note, this code was shamelessly copied from
> arch/x86/kernel/reboot.c with bits removed pertaining to the reboot_cpu
> command line parameter.
>
> Signed-off-by: Robin Holt <holt@....com>
> To: Shawn Guo <shawn.guo@...aro.org>

It works on my hardware - i.MX6 Quad.

Tested-by: Shawn Guo <shawn.guo@...aro.org>
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