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Date: Tue, 27 May 2014 08:45:52 +0530 From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com> To: "Rafael J. Wysocki" <rjw@...ysocki.net> CC: viresh.kumar@...aro.org, svaidy@...ux.vnet.ibm.com, ego@...ux.vnet.ibm.com, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] cpufreq: governor: Be friendly towards latency-sensitive bursty workloads On 05/27/2014 04:57 AM, Rafael J. Wysocki wrote: > Hi Srivatsa, > > On Tuesday, May 27, 2014 02:23:38 AM Srivatsa S. Bhat wrote: >> Cpufreq governors like the ondemand governor calculate the load on the CPU >> periodically by employing deferrable timers. A deferrable timer won't fire >> if the CPU is completely idle (and there are no other timers to be run), in >> order to avoid unnecessary wakeups and thus save CPU power. >> >> However, the load calculation logic is agnostic to all this, and this can >> lead to the problem described below. > > This is subtle enough that I need some more time to chew on it, but since the > merge window is coming, I'm not sure when that's going to happen honestly. > Sure, I completely understand. Please take your time, no hurry! Thank you very much! Regards, Srivatsa S. Bhat -- 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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