On 11/19/2013 11:24 PM, viresh kumar wrote: > On Tuesday 19 November 2013 11:13 PM, Nishanth Menon wrote: >> we depend on the first transition to take us to a sane configuration - >> but we cannot predict when and if it will happen. > > I really believe that it happens fairly quickly, isn't it? We straight away > start the sampling of load and withing few milliseconds we must be fixing the freq.. that heavily depends on the governor - and we all know the variants of ondemand governors that various distributions use. I cannot say (having not studied all governors out there) if this will take place in a few milliseconds or a few minutes or hours. > > We aren't going to stay for the unknown, might be unstable, freq for ever.. > With the current governors that we have in upstream, the only one of my concern has been userspace governor, but based on your comment earlier in the thread, this is considered an non-issue since userspace must trigger transition. However, this does put the SoC at risk depending on distro and custom governors used. If the opinion is that we dont care about these, well.. I can end my complaints and depend on the stats to tell me if an unknown frequency was ever attempted for debug (even though I might personally not be too excited about it). -- Regards, Nishanth Menon -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
