From: "H. Peter Anvin" <hpa@zytor.com>
To: "Yu, Fenghua" <fenghua.yu@intel.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
Ingo Molnar <mingo@kernel.org>,
"Luck, Tony" <tony.luck@intel.com>,
Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Mallick, Asit K" <asit.k.mallick@intel.com>,
Arjan Dan De Ven <arjan@linux.intel.com>,
"Brown, Len" <len.brown@intel.com>,
"Srivatssa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
Randy Dunlap <rdunlap@xenotime.net>,
Chen Gong <gong.chen@linux.intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-pm <linux-pm@vger.kernel.org>, x86 <x86@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v6 04/12] x86/smpboot.c: Don't offline CPU0 if any irq can not be migrated out of it and remove CPU0 check in smp_callin()
Date: Thu, 17 May 2012 20:34:31 -0700 [thread overview]
Message-ID: <4FB5C347.6010105@zytor.com> (raw)
In-Reply-To: <3E5A0FA7E9CA944F9D5414FEC6C71220077185AE@ORSMSX105.amr.corp.intel.com>
On 05/17/2012 06:47 PM, Yu, Fenghua wrote:
>
> Then booting up AP via INIT and putting AP online back via NMI/mwait
> will have different wakeup method and code. We probably need a way to
> tell if it is first AP bringup or online AP/BSP during run time.
>
> And if offlined CPU is not in mwait (e.g. CPU without mwait feature),
> mwait based bringup won't work. Do we need to fall back to NMI wakeup
> if offlined CPU is not in mwait?
>
I guess we need NMI (or just re-SIPI) in that case, since we're spinning
in CLI; HLT...
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2012-05-18 3:34 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-10 16:16 [PATCH v6 0/12] x86: Arbitrary CPU hot(un)plug support Fenghua Yu
2012-05-10 16:16 ` [PATCH v6 01/12] Documentations/cpu-hotplug.tx, kernel-parameters.txt: Add x86 CPU0 online/offline feature Fenghua Yu
2012-05-10 16:16 ` [PATCH v6 02/12] x86/Kconfig: Add config switch for CPU0 hotplug Fenghua Yu
2012-05-10 16:16 ` [PATCH v6 03/12] x86/topology.c: Support functions for CPU0 online/offline Fenghua Yu
2012-05-10 16:16 ` [PATCH v6 04/12] x86/smpboot.c: Don't offline CPU0 if any irq can not be migrated out of it and remove CPU0 check in smp_callin() Fenghua Yu
2012-05-11 12:05 ` Thomas Gleixner
2012-05-11 18:42 ` Tony Luck
2012-05-14 12:17 ` Ingo Molnar
2012-05-14 16:40 ` Luck, Tony
2012-05-14 20:03 ` Yu, Fenghua
2012-05-17 22:47 ` Suresh Siddha
2012-05-18 1:47 ` Yu, Fenghua
2012-05-18 3:34 ` H. Peter Anvin [this message]
2012-05-17 22:52 ` H. Peter Anvin
2012-05-18 6:46 ` Ingo Molnar
2012-05-10 16:16 ` [PATCH v6 05/12] x86/power/cpu.c: Don't hibernate/suspend if CPU0 is offline Fenghua Yu
2012-05-10 16:16 ` [PATCH v6 06/12] x86/head_64.S: Define start_cpu0 Fenghua Yu
2012-05-10 16:16 ` [PATCH v6 07/12] x86/head_32.S: " Fenghua Yu
2012-05-10 17:31 ` H. Peter Anvin
2012-05-10 20:48 ` Yu, Fenghua
2012-05-10 23:53 ` H. Peter Anvin
2012-05-10 16:16 ` [PATCH v6 08/12] x86/smpboot.c: Wake up CPU0 via NMI instead of INITs Fenghua Yu
2012-05-10 16:16 ` [PATCH v6 09/12] x86/common.c: Init CPU0 data during CPU0 online Fenghua Yu
2012-05-10 16:16 ` [PATCH v6 10/12] x86/mtrr/main.c: Ask the first online CPU to save mtrr Fenghua Yu
2012-05-10 16:16 ` [PATCH v6 11/12] x86/i387.c: Thread xstate is initialized only on CPU0 once Fenghua Yu
2012-05-10 16:16 ` [PATCH v6 12/12] x86/topology.c: debug CPU0 hotplug Fenghua Yu
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