linux-kernel - Re: [RFCv3 PATCH 00/48] sched: Energy cost model for energy-aware scheduling

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Message-ID: <20150410144631.GF8014@e105550-lin.cambridge.arm.com>
Date:	Fri, 10 Apr 2015 15:46:31 +0100
From:	Morten Rasmussen <morten.rasmussen@....com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Dietmar Eggemann <Dietmar.Eggemann@....com>,
	Yuyang Du <yuyang.du@...el.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Mike Turquette <mturquette@...aro.org>,
	Nicolas Pitre <nico@...aro.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	Juri Lelli <Juri.Lelli@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFCv3 PATCH 00/48] sched: Energy cost model for energy-aware
 scheduling

On Thu, Apr 09, 2015 at 08:41:34AM +0100, Vincent Guittot wrote:
> On 8 April 2015 at 15:33, Morten Rasmussen <morten.rasmussen@....com> wrote:
> > Hi Vincent,
> >
> > On Thu, Apr 02, 2015 at 01:43:31PM +0100, Vincent Guittot wrote:
> >> On 4 February 2015 at 19:30, Morten Rasmussen <morten.rasmussen@....com> wrote:
> >> > RFCv3 is a consolidation of the latest energy model related patches and
> >> > previously posted patch sets related to capacity and utilization
> >> > tracking [2][3] to show where we are heading. [2] and [3] have been
> >> > rebased onto v3.19-rc7 with a few minor modifications. Large parts of
> >> > the energy model code and use of the energy model in the scheduler has
> >> > been rewritten and simplified. The patch set consists of three main
> >> > parts (more details further down):
> >> >
> >> > Patch 1-11:  sched: consolidation of CPU capacity and usage [2] (rebase)
> >> >
> >> > Patch 12-19: sched: frequency and cpu invariant per-entity load-tracking
> >> >                     and other load-tracking bits [3] (rebase)
> >> >
> >> > Patch 20-48: sched: Energy cost model for energy-aware scheduling (RFCv3)
> >>
> >>
> >> Hi Morten,
> >>
> >> 48 patches is a big number of patches and when i look into your
> >> patchset, some feature are quite self contained. IMHO it would be
> >> worth splitting it in smaller patchsets in order to ease the review
> >> and the regression test.
> >> From a 1st look at your patchset , i have found
> >> -patches 11,13,14 and 15 are only linked to frequency scaling invariance
> >> -patches 12, 17 and 17 are only about adding cpu scaling invariance
> >> -patches 18 and 19 are about tracking and adding the blocked
> >> utilization in the CPU usage
> >> -patches 20 to the end is linked the EAS
> >
> > I agree it makes sense to regroup the patches as you suggest. A better
> > logical ordering should make the reviewing a less daunting task. I'm a
> > bit hesitant to float many small sets of patches as their role in the
> > bigger picture would be less clear and hence risk loosing the 'why'.
> > IMHO, it should be as easy (if not easier) to review and pick patches in
> > a larger set as it is for multiple smaller sets. However, I guess that
> 
> Having self contained patchset merged in a larger set  can create so
> useless dependency between them as they modify same area but for
> different goal
> 
> > is individual and for automated testing it would be easier to have them
> > split out.
> >
> > How about focusing on one (or two) of these smaller patch sets at the
> > time to minimize the potential confusion and post them separately?
> 
> I'm fine with your proposal to start with 1 or 2 smaller patchset. The
> 2 following patchset are, IMHO, the ones the most self contained and
> straight forward:
> - patches 11,13,14 and 15 are only linked to frequency scaling invariance
> - patches 18 and 19 are about tracking and adding the blocked
> utilization in the CPU usage
> 
> May be we can start with them ?

Agreed. Those two would form meaningful patch sets. I will fix them and
split them out.

Thanks,
Morten
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