linux-kernel - Re: [PATCH 03/16] sched: aggregate load contributed by task entities on parenting cfs

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Message-ID: <20120709091517.GC2901@gmail.com>
Date:	Mon, 9 Jul 2012 11:15:17 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Paul Turner <pjt@...gle.com>, linux-kernel@...r.kernel.org,
	Venki Pallipadi <venki@...gle.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>,
	Mike Galbraith <efault@....de>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ben Segall <bsegall@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Subject: Re: [PATCH 03/16] sched: aggregate load contributed by task entities
 on parenting cfs_rq


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Wed, 2012-07-04 at 17:28 +0200, Peter Zijlstra wrote:
> > On Wed, 2012-06-27 at 19:24 -0700, Paul Turner wrote:
> > > For a given task t, we can compute its contribution to load as:
> > >   task_load(t) = runnable_avg(t) * weight(t)
> > > 
> > > On a parenting cfs_rq we can then aggregate
> > >   runnable_load(cfs_rq) = \Sum task_load(t), for all runnable children t
> > > 
> > > Maintain this bottom up, with task entities adding their contributed load to
> > > the parenting cfs_rq sum.  When a task entities load changes we add the same
> > > delta to the maintained sum.
> > > 
> > > Signed-off-by: Paul Turner <pjt@...gle.com>
> > > Signed-off-by: Ben Segall <bsegall@...gle.com> 
> > 
> > A lot of patches have this funny sob trail.. Ben never send me these
> > patches, so uhm. ?
> > 
> > Should that be Reviewed-by, or what is the deal with those?
> 
> Ben could you clarify what your exact contribution was?
> 
> Ingo, supposing Ben is co-author and wrote a significant part 
> of the patch, what are we supposed to do with these tags?

There can be only one author SOB - additional contributions 
should be reflected via credits in the changelog, copyright 
lines and/or Originally-From: tags, or so.

Thanks,

	Ingo
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