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Date: Mon, 4 Jun 2012 17:19:08 +0400 From: Vladimir Davydov <VDavydov@...allels.com> To: Arjan van de Ven <arjan@...ux.intel.com> CC: Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Len Brown <lenb@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] cpuidle: menu: use nr_running instead of cpuload for calculating perf mult On Jun 4, 2012, at 5:15 PM, "Arjan van de Ven" <arjan@...ux.intel.com> wrote: > On 6/4/2012 3:24 AM, Vladimir Davydov wrote: >> rq->cpuload strongly depends on cgroup hierarchy. For example, if hundreds of >> tasks are running inside cpu:/test cgroup, the sum of cpuload over all cpus >> won't exceed 1024 (by default). That makes the cpuidle menu governor take wrong >> decisions, which can negatively affect overall performance. > > nr_running is the wrong answer... it is instantaneous, not longer term. > cpuidle wants a longer term, per cpu, notion of "busy", to use as proxy > for performance sensitivity. > > I use not the instantaneous nr_running, but nr_running last seen in update_cpu_load() where cpuload[0], which is currently used by cpuidle, is updated. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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