From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>, Robin Holt <holt@sgi.com>,
Ingo Molnar <mingo@redhat.com>, Russ Anderson <rja@sgi.com>,
Shawn Guo <shawn.guo@linaro.org>, Oleg Nesterov <oleg@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>, Joe Perches <joe@perches.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Michel Lespinasse <walken@google.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Paul Mackerras <paulus@samba.org>,
Peter Zijlstra <peterz@infradead.org>,
"rusty@rustcorp.com.au" <rusty@rustcorp.com.au>,
Tejun Heo <tj@kernel.org>,
the arch/x86 maintainers <x86@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Fenghua Yu <fenghua.yu@intel.com>
Subject: Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.
Date: Fri, 19 Apr 2013 13:59:33 +0530 [thread overview]
Message-ID: <5171006D.40600@linux.vnet.ibm.com> (raw)
In-Reply-To: <20130419075629.GE20897@gmail.com>
On 04/19/2013 01:26 PM, Ingo Molnar wrote:
>
> * Borislav Petkov <bp@alien8.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
next prev parent reply other threads:[~2013-04-19 8:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-16 9:58 Robin Holt
2013-04-16 11:32 ` Ingo Molnar
2013-04-16 12:06 ` Robin Holt
2013-04-16 14:01 ` Robin Holt
2013-04-17 7:46 ` Ingo Molnar
2013-04-17 9:27 ` Borislav Petkov
2013-04-19 7:56 ` Ingo Molnar
2013-04-19 8:29 ` Srivatsa S. Bhat [this message]
2013-04-19 8:44 ` Ingo Molnar
2013-04-16 15:48 ` Srivatsa S. Bhat
2013-04-16 16:22 ` Robin Holt
2013-04-17 7:48 ` Ingo Molnar
2013-04-17 10:03 ` Robin Holt
2013-04-17 11:31 ` Srivatsa S. Bhat
2013-04-17 11:58 ` Robin Holt
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