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

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Message-ID: <4FCE6341.3080105@linux.intel.com>
Date:	Tue, 05 Jun 2012 12:51:29 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 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


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