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

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Message-ID: <20140729011713.GD5203@intel.com>
Date:	Tue, 29 Jul 2014 09:17:13 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 12:38:12PM +0200, Peter Zijlstra wrote:
> 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.
> 

Yes. So I will hook up do_exit. Hope I did it right. Likewise, also do group entity
in group destroy and group offline? 
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