linux-kernel - Re: [tip:sched/core] sched: Do not account irq time to current task

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Message-ID: <AANLkTinv6M-aeNjUStMi05UDbi15ZvTKSu9N-hM63F7J@mail.gmail.com>
Date:	Wed, 1 Dec 2010 10:55:59 -0800
From:	Venkatesh Pallipadi <venki@...gle.com>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	Raistlin <raistlin@...ux.it>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	mingo@...e.hu, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched: Do not account irq time to current task

On Mon, Nov 29, 2010 at 9:57 PM, Yong Zhang <yong.zhang0@...il.com> wrote:
> On Tue, Nov 30, 2010 at 1:06 AM, Raistlin <raistlin@...ux.it> wrote:
>> On Mon, 2010-11-29 at 22:22 +0800, Yong Zhang wrote:
>>> > If you still want to throttle RT tasks simply ensure their bandwidth
>>> > constraint is lower than the available time.
>>>
>>> But the available time is harder to calculated than before.
>>>
>> Well, it shouldn't... I would say it makes it easier! :-P
>
> It depends on the way how we see it.
> From the side that we can just focus on task time, it's easy
> and well understood.  :)
>
> Now I think we need a way to export the irq_time to user,
> then the user can determine the average time spending
> on IRQ.
> Maybe Venkatesh Pallipadi's patchset titled "Proper
> kernel irq time reporting" is the one.
>

Yes. That second patchset exports this information through /proc/stat.
Peter: Can you pull that patchset into tip.

Thanks,
Venki
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