linux-kernel - Re: [PATCH 0/2 v4] sched: Rewrite per entity runnable load average tracking

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Message-ID: <20140728103812.GP6758@twins.programming.kicks-ass.net>
Date:	Mon, 28 Jul 2014 12:38:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Yuyang Du <yuyang.du@...el.com>
Cc:	Morten Rasmussen <morten.rasmussen@....com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"pjt@...gle.com" <pjt@...gle.com>,
	"bsegall@...gle.com" <bsegall@...gle.com>,
	"arjan.van.de.ven@...el.com" <arjan.van.de.ven@...el.com>,
	"len.brown@...el.com" <len.brown@...el.com>,
	"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
	"alan.cox@...el.com" <alan.cox@...el.com>,
	"mark.gross@...el.com" <mark.gross@...el.com>,
	"fengguang.wu@...el.com" <fengguang.wu@...el.com>
Subject: Re: [PATCH 0/2 v4] sched: Rewrite per entity runnable load average
 tracking

On Mon, Jul 28, 2014 at 03:02:37AM +0800, Yuyang Du wrote:
> > Another thing that might be an issue is that the blocked of a terminated
> > task lives on for quite a while until has decayed away.
> 
> Good point. To do so, if I read correctly, we need to hook do_exit(), but probably
> we are gonna encounter rq->lock issue.
> 
> What is the opinion/guidance from the maintainers/others?

So the entire point of this per entity tracking was to make sure load
numbers reflect reality. We account migrations etc., it would be weird
to then throw all that out the window and let task exit accumulate crap.



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