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Date: Tue, 10 Sep 2013 19:07:39 +0200 (CEST) From: Guennadi Liakhovetski <g.liakhovetski@....de> To: Viresh Kumar <viresh.kumar@...aro.org> cc: Greg KH <greg@...ah.com>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, "cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>, SH-Linux <linux-sh@...r.kernel.org>, Magnus Damm <magnus.damm@...il.com> Subject: Re: "cpufreq: fix serialization issues with freq change notifiers" breaks cpufreq too On Tue, 10 Sep 2013, Viresh Kumar wrote: > On 10 September 2013 21:52, Guennadi Liakhovetski <g.liakhovetski@....de> wrote: > > Of course, isn't that what I've written above? reverted a commit and added > > debug - in that order. > > Ok, I misread it then :( > > > Sure, I can... So, with the performance governor I get > > > > [ 1.290000] cpufreq-cpu0 cpufreq-cpu0: Looking up cpu0-supply from device tree > > [ 1.290000] cpufreq: trying to register driver generic_cpu0 > > [ 1.290000] cpufreq: adding CPU 0 > > [ 1.290000] cpufreq: Adding link for CPU: 1 > > [ 1.290000] cpufreq: setting new policy for CPU 0: 398667 - 1196000 kHz > > [ 1.290000] cpufreq: new min and max freqs are 398667 - 1196000 kHz > > [ 1.290000] cpufreq: governor switch > > [ 1.290000] cpufreq: __cpufreq_governor for CPU 0, event 4 > > [ 1.290000] cpufreq: __cpufreq_governor for CPU 0, event 1 > > [ 1.290000] cpufreq_performance: setting to 1196000 kHz because of event 1 > > [ 1.290000] cpufreq: __cpufreq_driver_target().1665 1 > > > > This is my debug - .transition_ongoing is incremented ^^^^^^^^ > > > > [ 1.300000] cpufreq: target for CPU 0: 1196000 kHz, relation 1, requested 1196000 kHz > > Quite straight forward actually.. Apparently, not quite. > Please try attached patch and see if it fixes > your problem.. Which it should if I am not wrong.. I will send it > separately then.. It helps only once. The first switching works, the second one doesn't. Below debug [ 12.010000] cpufreq: setting new policy for CPU 0: 398667 - 1196000 kHz [ 12.010000] cpufreq: new min and max freqs are 398667 - 1196000 kHz [ 12.010000] cpufreq: governor switch [ 12.010000] cpufreq: __cpufreq_governor for CPU 0, event 2 [ 12.010000] cpufreq: __cpufreq_governor for CPU 0, event 5 [ 12.010000] ondemand governor failed, too long transition latency of HW, fallback to performance governor [ 12.020000] cpufreq: __cpufreq_governor for CPU 0, event 4 [ 12.020000] cpufreq: __cpufreq_governor for CPU 0, event 1 [ 12.020000] cpufreq_performance: setting to 1196000 kHz because of event 1 [ 12.020000] cpufreq: target for CPU 0: 1196000 kHz, relation 1, requested 1196000 kHz [ 12.020000] cpufreq: governor: change or update limits [ 12.020000] cpufreq: __cpufreq_governor for CPU 0, event 3 [ 12.020000] cpufreq_performance: setting to 1196000 kHz because of event 3 [ 12.020000] cpufreq: target for CPU 0: 1196000 kHz, relation 1, requested 1196000 kHz [ 12.030000] cpufreq: setting new policy for CPU 0: 398667 - 1196000 kHz [ 12.030000] cpufreq: new min and max freqs are 398667 - 1196000 kHz [ 12.030000] cpufreq: governor switch [ 12.030000] cpufreq: __cpufreq_governor for CPU 0, event 2 [ 12.030000] cpufreq: __cpufreq_governor for CPU 0, event 5 [ 12.030000] ondemand governor failed, too long transition latency of HW, fallback to performance governor [ 12.040000] cpufreq: __cpufreq_governor for CPU 0, event 4 [ 12.040000] cpufreq: __cpufreq_governor for CPU 0, event 1 [ 12.040000] cpufreq_performance: setting to 1196000 kHz because of event 1 [ 12.040000] cpufreq: target for CPU 0: 1196000 kHz, relation 1, requested 1196000 kHz [ 12.040000] cpufreq: governor: change or update limits [ 12.040000] cpufreq: __cpufreq_governor for CPU 0, event 3 [ 12.040000] cpufreq_performance: setting to 1196000 kHz because of event 3 [ 12.040000] cpufreq: target for CPU 0: 1196000 kHz, relation 1, requested 1196000 kHz echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor [ 66.490000] cpufreq: setting new policy for CPU 0: 398667 - 1196000 kHz [ 66.490000] cpufreq: new min and max freqs are 398667 - 1196000 kHz [ 66.490000] cpufreq: governor switch [ 66.490000] cpufreq: __cpufreq_governor for CPU 0, event 2 [ 66.490000] cpufreq: __cpufreq_governor for CPU 0, event 5 [ 66.490000] cpufreq: __cpufreq_governor for CPU 0, event 4 [ 66.490000] cpufreq: __cpufreq_governor for CPU 0, event 1 [ 66.490000] cpufreq: target for CPU 0: 398667 kHz, relation 0, requested 398667 kHz [ 66.490000] cpufreq: __cpufreq_driver_target().1677 1 [ 66.500000] cpufreq: notification 0 of frequency transition to 398666 kHz [ 66.500000] cpufreq: __cpufreq_notify_transition().297 2 [ 66.500000] cpufreq: notification 0 of frequency transition to 398666 kHz [ 66.500000] cpufreq: __cpufreq_notify_transition().297 3 [ 66.510000] cpufreq: notification 1 of frequency transition to 398666 kHz [ 66.510000] cpufreq: __cpufreq_notify_transition().327 2 [ 66.520000] cpufreq: FREQ: 398666 - CPU: 0 [ 66.520000] cpufreq: notification 1 of frequency transition to 398666 kHz [ 66.520000] cpufreq: __cpufreq_notify_transition().327 1 [ 66.520000] cpufreq: FREQ: 398666 - CPU: 1 [ 66.520000] cpufreq: cpufreq_notify_transition().366 0 [ 66.530000] cpufreq: governor: change or update limits [ 66.530000] cpufreq: __cpufreq_governor for CPU 0, event 3 [ 66.530000] cpufreq: target for CPU 0: 398667 kHz, relation 0, requested 398667 kHz [ 66.530000] cpufreq: __cpufreq_driver_target().1677 1 echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor [ 72.470000] cpufreq: setting new policy for CPU 0: 398667 - 1196000 kHz [ 72.470000] cpufreq: new min and max freqs are 398667 - 1196000 kHz [ 72.470000] cpufreq: governor switch [ 72.470000] cpufreq: __cpufreq_governor for CPU 0, event 2 [ 72.470000] cpufreq: __cpufreq_governor for CPU 0, event 5 [ 72.470000] cpufreq: __cpufreq_governor for CPU 0, event 4 [ 72.470000] cpufreq: __cpufreq_governor for CPU 0, event 1 [ 72.470000] cpufreq_performance: setting to 1196000 kHz because of event 1 [ 72.470000] cpufreq: target for CPU 0: 1196000 kHz, relation 1, requested 1196000 kHz [ 72.470000] cpufreq: governor: change or update limits [ 72.470000] cpufreq: __cpufreq_governor for CPU 0, event 3 [ 72.470000] cpufreq_performance: setting to 1196000 kHz because of event 3 [ 72.470000] cpufreq: target for CPU 0: 1196000 kHz, relation 1, requested 1196000 kHz > Thanks for your time.. Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- 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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