linux-kernel - Re: [PATCH 4/6] sched: Do not account irq time to current task

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Date:	Mon, 20 Sep 2010 19:38:26 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Venkatesh Pallipadi <venki@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org, Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH 4/6] sched: Do not account irq time to current task

On Mon, 2010-09-20 at 10:33 -0700, Venkatesh Pallipadi wrote:
> Yes. I like your idea of having separate rq->clock and rq->clock_task.
> That will clean up this code a bit.
> We will still need to keep track of "last accounted irq time" at the
> task or rq level to account sched_rt_avg_update correctly. But, I dont
> have to play with cfs_rq and rt_rq as in this patch though. 

Ah, indeed. Ok so have rq->clock, rq->clock_task and have a
irq_time_stamp to fold stuff into sched_rt_avg_update(), then I think
you can isolate all the clock bits to update_rq_clock() and then use
->clock_task in update_curr{,_rt}().


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