linux-kernel - Re: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi

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Message-ID: <1338925967.2749.39.camel@twins>
Date:	Tue, 05 Jun 2012 21:52:47 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arjan van de Ven <arjan@...ux.intel.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>,
	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 12:51 -0700, Arjan van de Ven wrote:
> On 6/5/2012 12:49 PM, Peter Zijlstra wrote:
> > On Tue, 2012-06-05 at 21:43 +0200, Thomas Gleixner wrote:
> >> Vs. the interrupt/timer/other crap madness:
> >>
> >>  - We really don't want to have an interrupt balancer in the kernel
> >>    again, but we need a mechanism to prevent the user space balancer
> >>    trainwreck from ruining the power saving party.
> > 
> > What's wrong with having an interrupt balancer tied to the scheduler
> > which optimistically tries to avoid interrupting nohz/isolated/idle
> > cpus?
> 
> ideally threaded interrupts are like this.. we really should push for
> more usage of such and it all falls into place

They are nothing like that.. threaded interrupts still have a hardirq
kick-off that's ran on whatever interrupt the interrupt routing picks.
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