linux-kernel - Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.

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Message-ID: <5171006D.40600@linux.vnet.ibm.com>
Date:	Fri, 19 Apr 2013 13:59:33 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Borislav Petkov <bp@...en8.de>, Robin Holt <holt@....com>,
	Ingo Molnar <mingo@...hat.com>, Russ Anderson <rja@....com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Joe Perches <joe@...ches.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>,
	Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.

On 04/19/2013 01:26 PM, Ingo Molnar wrote:
> 
> * Borislav Petkov <bp@...en8.de> wrote:
> 
>> On Wed, Apr 17, 2013 at 09:46:53AM +0200, Ingo Molnar wrote:
>>
>>> What you mention here should indeed already be handled by the architecture 
>>> hotplug code (for example on x86 the boot CPU cannot be hot-removed).
>>
>> Supposedly, some new Intels (I think Ivybridge or so) can actually be 
>> hot-removed.
> 
> There are WIP patches in existence that remove the limitations on the kernel side, 
> but they are not upstream yet, so currently the constraint exists upstream.
> 

I thought Fenghua Yu's upstream commits were supposed to handle that. Don't they?

a71c8bc x86, topology: Debug CPU0 hotplug
6f5298c x86/i387.c: Initialize thread xstate only on CPU0 only once
8d966a0 x86, hotplug: Handle retrigger irq by the first available CPU
30242aa x86, hotplug: The first online processor saves the MTRR state
27fd185 x86, hotplug: During CPU0 online, enable x2apic, set_numa_node.
e1c467e x86, hotplug: Wake up CPU0 via NMI instead of INIT, SIPI, SIPI
3e2a0cc x86-32, hotplug: Add start_cpu0() entry point to head_32.S
42e78e9 x86-64, hotplug: Add start_cpu0() entry point to head_64.S
6e32d47 kernel/cpu.c: Add comment for priority in cpu_hotplug_pm_callback
209efae x86, hotplug, suspend: Online CPU0 for suspend or hibernate
30106c1 x86, hotplug: Support functions for CPU0 online/offline
4d25031 x86, topology: Don't offline CPU0 if any PIC irq can not be migrated out of it
80aa1df x86, Kconfig: Add config switch for CPU0 hotplug
f78cff4 doc: Add x86 CPU0 online/offline feature

Regards,
Srivatsa S. Bhat

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