linux-kernel - Re: [RFC 5/8] Track the "total rq utilisation" too

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Message-ID: <20160115083359.GC3421@worktop>
Date:	Fri, 15 Jan 2016 09:34:00 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Luca Abeni <luca.abeni@...tn.it>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@....com>
Subject: Re: [RFC 5/8] Track the "total rq utilisation" too

On Fri, Jan 15, 2016 at 07:50:49AM +0100, Luca Abeni wrote:
> On Thu, 14 Jan 2016 20:48:37 +0100
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Thu, Jan 14, 2016 at 04:24:50PM +0100, Luca Abeni wrote:
> > > This is the sum of the utilisations of tasks that are assigned to
> > > a runqueue, independently from their state (TASK_RUNNING or blocked)
> > 
> > Is it actually used?
> Not in this patchset...
> It is a possible "cheap" (but less accurate) alternative to the
> tracking introduced in patch 4. Or can be used in more advanced
> implementations of multi-processor GRUB, but not in this patchset.
> 
> So, it can be removed from the patchset; I added it so that people can
> see all the possible alternative utilization tracking strategies.

OK, so that might've been useful text for the changelog. But given that,
maybe leave it out for now.

BTW, have you got a paper on smp grub?