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Date: Wed, 06 Jun 2012 10:43:43 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: paulmck@...ux.vnet.ibm.com
Cc: Thomas Gleixner <tglx@...utronix.de>,
"Luck, Tony" <tony.luck@...el.com>,
"Yu, Fenghua" <fenghua.yu@...el.com>,
Rusty Russell <rusty@...tcorp.com.au>,
Ingo Molnar <mingo@...e.hu>, H Peter Anvin <hpa@...or.com>,
"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
"Mallick, Asit K" <asit.k.mallick@...el.com>,
Arjan Dan De Ven <arjan@...ux.intel.com>,
linux-kernel <linux-kernel@...r.kernel.org>,
x86 <x86@...nel.org>, linux-pm <linux-pm@...r.kernel.org>,
"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: Re: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or
nmi
On Tue, 2012-06-05 at 15:12 -0700, Paul E. McKenney wrote:
> > What I can't see is the isolated functional, aside from the above
> > mentioned things, that's not strictly a per-cpu property, we can have a
> > group that's isolated from the rest but not from each other.
>
> I suspect that Thomas is thinking that the CPU is so idle that it no
> longer has to participate in TLB invalidation or RCU. (Thomas will
> correct me if I am confused.) But Peter, is that the level of idle
> you are thinking of?
No, we're talking about isolated, so its very much running something.
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