linux-kernel - Re: [PATCH 2/2] sched: Rewrite per entity runnable load average tracking

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Date:	Fri, 11 Jul 2014 07:22:07 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	bsegall@...gle.com, mingo@...hat.com, linux-kernel@...r.kernel.org,
	rafael.j.wysocki@...el.com, arjan.van.de.ven@...el.com,
	len.brown@...el.com, alan.cox@...el.com, mark.gross@...el.com,
	pjt@...gle.com, fengguang.wu@...el.com
Subject: Re: [PATCH 2/2] sched: Rewrite per entity runnable load average
 tracking

On Thu, Jul 10, 2014 at 12:08:59PM +0200, Peter Zijlstra wrote:
> 
> Since clock_task is the regular clock minus some local amount, the
> difference between two regular clock reads is always a strict upper
> bound on clock_task differences.
> 
This is inspiring. Regarding the clock source in load avg tracking,
should we simply use rq_clock_task instead of cfs_rq_clock_task.

For the bandwidth control case, just update/increase the last_update_time when
unthrottled by this throttled time, so the time would look like freezed. Am I
understanding right?

Not sure how much bandwidth control is used, but even not used, every time
we read cfs_rq_clock_task, will burn useless cycles here.

Thanks,
Yuyang
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