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Date: Thu, 05 Jun 2014 09:59:21 +0100 From: Dietmar Eggemann <dietmar.eggemann@....com> To: Vincent Guittot <vincent.guittot@...aro.org> CC: "peterz@...radead.org" <peterz@...radead.org>, "mingo@...nel.org" <mingo@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux@....linux.org.uk" <linux@....linux.org.uk>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>, Morten Rasmussen <Morten.Rasmussen@....com>, "efault@....de" <efault@....de>, "nicolas.pitre@...aro.org" <nicolas.pitre@...aro.org>, "linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>, "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org> Subject: Re: [PATCH v2 04/11] sched: Allow all archs to set the power_orig [...] >> Firstly, we need to scale cpu power in update_cpu_power() regarding >> uArch, frequency and rt/irq pressure. >> Here the freq related value we get back from arch_scale_freq_power(..., >> cpu) could be an instantaneous value (curr_freq(cpu)/max_freq(cpu)). >> >> Secondly, to be able to scale the runnable avg sum of a sched entity >> (se->avg->runnable_avg_sum), we preferable have a coefficient >> representing uArch diffs (cpu_power_orig(cpu)/cpu_power_orig(most >> powerful cpu in the system) and another coefficient (avg freq over 'now > > AFAICT, the coefficient representing uArch diffs is already taken into > account into power_freq thanks to scale_cpu, isn't it ? True, but I can't see how the current signature of arch_scale_cpu_power() and arch_scale_freq_power() fit into this uArch and freq invariant updating of se->avg->runnable_avg_sum business. >> - sa->last_runnable_update'(cpu)/max_freq(cpu). This value would have to >> be retrieved from the arch in __update_entity_runnable_avg(). >> [...] -- 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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