linux-kernel - Re: [PATCH v2 -tip] sched/rt: Fix locality of threaded interrupt handlers

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Message-ID: <20130214143712.GA31777@dhcp-26-207.brq.redhat.com>
Date:	Thu, 14 Feb 2013 15:37:12 +0100
From:	Alexander Gordeev <agordeev@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 -tip] sched/rt: Fix locality of threaded interrupt
 handlers

On Mon, Jan 14, 2013 at 03:11:52PM +0100, Alexander Gordeev wrote:
> When a interrupt affinity mask targets multiple CPUs, the
> RT scheduler selects a runqueue for RT task corresponding
> to a threaded interrupt handler without consideration of
> where the interrupt is actually gets delivered. It leads
> to a suboptimal condition when a hardware interrupt handler
> executes on one CPU while the threaded interrupt handler
> executes on another CPU.
> 
> This fix alters the behaviour of threaded handler wake-ups
> by getting priority to a CPU where the hardware interrupt
> handler is executing. As result, most of the time both
> halves of interrupt handling are kept local.

Hi Thomas, Ingo,

Would you ack/consider this patch?

Thanks!

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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