linux-kernel - Re: [Resend patch v8 06/13] sched: compute runnable load avg in cpu_load and cpu_avg_load_per

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Message-ID: <CAPM31RKrvY4zVRQBKnaQjdH0ROO3nAvPn5biP0O3ogmfubuXbg@mail.gmail.com>
Date:	Mon, 24 Jun 2013 04:06:52 -0700
From:	Paul Turner <pjt@...gle.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Alex Shi <alex.shi@...el.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>,
	Morten Rasmussen <morten.rasmussen@....com>,
	gregkh@...uxfoundation.org,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>, rafael.j.wysocki@...el.com,
	jkosina@...e.cz, Clark Williams <clark.williams@...il.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>, keescook@...omium.org,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>
Subject: Re: [Resend patch v8 06/13] sched: compute runnable load avg in
 cpu_load and cpu_avg_load_per_task

> AFAICT, the RT tasks activity is already taken into account by
> decreasing the cpu_power that is used during load balance like in the
> find_busiest_queue where weighted_cpuload is divided by cpu_power.
>

Yes.  RT tasks used to be handled as having a very-large weight [e.g.
2*nice(-20)] but now we just scale cpu-power for how much non-RT time
there is available.
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