linux-kernel - Re: RFC: THE OFFLINE SCHEDULER

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Message-ID: <4A984A05.9080009@nortel.com>
Date:	Fri, 28 Aug 2009 15:20:05 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Christoph Lameter <cl@...ux-foundation.org>,
	raz ben yehuda <raziebe@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	peterz@...radead.org, maximlevitsky@...il.com, efault@....de,
	riel@...hat.com, wiseman@...s.biu.ac.il,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: RFC: THE OFFLINE SCHEDULER

On 08/27/2009 06:44 PM, Thomas Gleixner wrote:
> On Thu, 27 Aug 2009, Chris Friesen wrote:
>> How would you deal with per-cpu kernel threads (softirqs, etc.) or
>> softirq processing while in the kernel?
> 
> If you have pinned an interrupt to that CPU then you need to process
> the softirq for it as well. If that's the device your very single user
> space thread is talking to then you better want that, if you are not
> interested then simply pin that device irq to some other CPU: no irq
> -> no softirq.

Ah, okay.  For some reason I had thought that the incoming work was
queued up globally and might be handled by any softirq.

Chris
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