From: Thomas Gleixner <tglx@linutronix.de>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: "Yu, Fenghua" <fenghua.yu@intel.com>, Ingo Molnar <mingo@elte.hu>,
H Peter Anvin <hpa@zytor.com>,
"Siddha, Suresh B" <suresh.b.siddha@intel.com>,
"Mallick, Asit K" <asit.k.mallick@intel.com>,
Arjan Dan De Ven <arjan@linux.intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>,
linux-pm <linux-pm@vger.kernel.org>,
"Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Rusty Russell <rusty@rustcorp.com.au>
Subject: RE: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi
Date: Tue, 5 Jun 2012 00:52:25 +0200 (CEST) [thread overview]
Message-ID: <alpine.LFD.2.02.1206050049410.3086@ionos> (raw)
In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F192F7F17@ORSMSX104.amr.corp.intel.com>
On Mon, 4 Jun 2012, Luck, Tony wrote:
> > I'm working on a proper state machine driven online/offline sequence,
> > where you can put the cpu into an intermediate state which avoids
> > bringing it down completely. This is enough to get the full
> > powersaving benefits w/o having to go through all the synchronization
> > states of a full online/offline. That will shorten the onlining time
> > of an previously offlined cpu to almost nothing.
>
> Will this also be a step towards Fenghua's goal of being able to
> take cpu#0 away. I.e. will your state machine be fully symmetric
> and allow for cpu#0 to enter this intermediate mostly-offline state?
The state machine does not care about the cpu number.
The only reverence to the initial boot cpu is that it can enter the
state machine at the "running" level instead of going through all
instances. That's unavoidable AFAICT.
Thanks,
tglx
next prev parent reply other threads:[~2012-06-04 22:52 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-04 18:17 Fenghua Yu
2012-06-04 18:17 ` [PATCH 1/6] x86/Documentation/kernel-parameters.txt: Add wakeup_cpu_via_init kernel parameter help Fenghua Yu
2012-06-04 18:17 ` [PATCH 2/6] x86/head_32.S/head_64.S: Kernel entry code after waking up offline CPU via mwait or nmi Fenghua Yu
2012-06-04 18:17 ` [PATCH 3/6] x86/smpboot.c: Wake " Fenghua Yu
2012-06-04 18:58 ` Suresh Siddha
2012-06-04 19:35 ` Yu, Fenghua
2012-06-04 18:17 ` [PATCH 4/6] x86/apic_flat_64.c: Wakeup function in apic calls mwait or nmi method Fenghua Yu
2012-06-04 18:17 ` [PATCH 5/6] x86/x2apic_cluster.c: Wakeup function in x2apic_cluster " Fenghua Yu
2012-06-04 18:17 ` [PATCH 6/6] x86/x2apic_phys.c: Wakeup function in x2apic_phys " Fenghua Yu
2012-06-04 18:17 ` Fenghua Yu
2012-06-04 20:11 ` [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi Thomas Gleixner
2012-06-04 20:18 ` Luck, Tony
2012-06-04 22:52 ` Thomas Gleixner [this message]
2012-06-04 20:33 ` Peter Zijlstra
2012-06-05 0:40 ` Rusty Russell
2012-06-05 1:23 ` Arjan van de Ven
2012-06-05 7:38 ` Peter Zijlstra
2012-06-05 14:17 ` Alan Stern
2012-06-05 15:27 ` Arjan van de Ven
2012-06-05 7:39 ` Peter Zijlstra
2012-06-05 16:02 ` Yu, Fenghua
2012-06-05 16:09 ` Peter Zijlstra
2012-06-05 16:18 ` Yu, Fenghua
2012-06-05 16:19 ` Peter Zijlstra
2012-06-05 17:44 ` Luck, Tony
2012-06-05 17:50 ` Peter Zijlstra
2012-06-05 19:43 ` Thomas Gleixner
2012-06-05 19:45 ` Peter Zijlstra
2012-06-05 19:49 ` Peter Zijlstra
2012-06-05 19:51 ` Arjan van de Ven
2012-06-05 19:52 ` Peter Zijlstra
2012-06-05 20:47 ` Thomas Gleixner
2012-06-05 21:30 ` Peter Zijlstra
2012-06-05 22:09 ` Thomas Gleixner
2012-06-06 8:23 ` Peter Zijlstra
2012-06-06 8:30 ` Peter Zijlstra
2012-06-06 8:40 ` Peter Zijlstra
2012-06-05 22:12 ` Paul E. McKenney
2012-06-06 8:40 ` Peter Zijlstra
2012-06-06 8:42 ` Peter Zijlstra
2012-06-06 14:44 ` Paul E. McKenney
2012-06-06 15:46 ` Peter Zijlstra
2012-06-06 23:20 ` Paul E. McKenney
2012-06-08 9:20 ` Peter Zijlstra
2012-06-06 8:43 ` Peter Zijlstra
2012-06-06 14:41 ` Paul E. McKenney
2012-06-06 15:23 ` Arjan van de Ven
2012-06-06 15:48 ` Peter Zijlstra
2012-06-06 15:49 ` Paul E. McKenney
2012-06-06 16:59 ` Arjan van de Ven
2012-06-05 21:29 ` Paul E. McKenney
2012-06-05 21:37 ` Peter Zijlstra
2012-06-05 22:00 ` Paul E. McKenney
2012-06-06 12:17 ` Peter Zijlstra
2012-06-06 14:43 ` Paul E. McKenney
2012-06-05 19:51 ` Peter Zijlstra
2012-06-05 20:58 ` Andi Kleen
2012-06-05 21:15 ` Thomas Gleixner
2012-06-05 21:33 ` Thomas Gleixner
2012-06-05 23:13 ` Andi Kleen
2012-06-06 1:52 ` Arjan van de Ven
2012-06-05 18:07 ` Peter Zijlstra
2012-06-05 19:54 ` Luck, Tony
2012-06-05 19:56 ` Peter Zijlstra
2012-06-05 9:36 ` Thomas Gleixner
2012-06-05 13:41 ` [PATCH] kthread: Implement park/unpark facility Thomas Gleixner
2012-06-05 14:01 ` Peter Zijlstra
2012-06-05 14:05 ` Peter Zijlstra
2012-06-07 0:04 ` H. Peter Anvin
2012-06-10 5:40 ` Rusty Russell
2012-06-11 9:26 ` Thomas Gleixner
2012-06-12 0:23 ` Rusty Russell
2012-06-05 15:35 ` [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi Jiang Liu
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