linux-kernel - Re: [patch v2 1/2] sched: Use resched IPI to kick off the nohz idle balance

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Date:	Mon, 10 Oct 2011 11:25:42 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Venki Pallipadi <venki@...gle.com>,
	Ingo Molnar <mingo@...e.hu>,
	Prarit Bhargava <prarit@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...nel.org" <stable@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [patch v2 1/2] sched: Use resched IPI to kick off the nohz idle
 balance

On Mon, Oct 10, 2011 at 04:06:04PM +0200, Peter Zijlstra wrote:
> On Mon, 2011-10-10 at 09:52 -0400, Vivek Goyal wrote:
> 
> > I did partial backport of above to come up with a fix for rhel6 and put
> > your first patch on top of it. 
> 
> You might also want to look at these for PPC64:
> 
> 23d72bfd8f9f24aa9efafed3586a99f5669c23d7

This seems to be just cleanup of the way IPI are handled in ppc64
(mux/demux). I don't understand the details but looks like not a
necessary component of the problem at hand.

> 880102e78547c1db158a17e36cf0cdd98e7ad710

Here Benjamin talks about following.

    Manual merge of arch/powerpc/kernel/smp.c and add missing scheduler_ipi()
    call to arch/powerpc/platforms/cell/interrupt.c

And I can't find any scheduler_ipi() call in current cell/interrupt.c. So
either it got moved or something else happend. CCing him to find out. 

Thanks
Vivek
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