linux-kernel - Re: [RFC PATCH 0/2] sched: move content out of core files for load average

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Message-ID: <20130419105855.GA30060@gmail.com>
Date:	Fri, 19 Apr 2013 12:58:55 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/2] sched: move content out of core files for load
 average


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

> On Fri, 2013-04-19 at 10:25 +0200, Ingo Molnar wrote:
> > It might eventually make sense to integrate the 'average load'
> > calculation as well 
> > with all this - as they really have a similar purpose, the avenload[]
> > vector of 
> > averages is conceptually similar to the rq->cpu_load[] vector of
> > averages.
> 
> The /proc/loadavg definition isn't useful for anything remotely sane
> wrt load-balancing or otherwise, so I don't really see that integration
> happening (its a measure of how many tasks are blocked, where the
> load-balancer needs a measure of how many tasks are wanting to run).

Well, loadavg also includes running tasks:

        nr_active = this_rq->nr_running;
        nr_active += (long) this_rq->nr_uninterruptible;

but yeah, the two are not the same. It could at least integrate in terms 
of averaging code, working on two different instances of data structures - 
but yeah, full integration is indeed not possible.

Thanks,

	Ingo
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