| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <CAKohpo=aLnhM0Op_32ohWZK5eG5nT7iK0OktBe+8ygOQW7zUqQ@mail.gmail.com> Date: Mon, 4 Feb 2013 19:28:16 +0530 From: Viresh Kumar <viresh.kumar@...aro.org> To: Borislav Petkov <bp@...en8.de>, Viresh Kumar <viresh.kumar@...aro.org>, "Rafael J. Wysocki" <rjw@...k.pl>, cpufreq@...r.kernel.org, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org, robin.randhawa@....com, Steve.Bannister@....com, Liviu.Dudau@....com Subject: Re: [PATCH 0/4] CPUFreq: Implement per policy instances of governors On 4 February 2013 19:06, Borislav Petkov <bp@...en8.de> wrote: > On Mon, Feb 04, 2013 at 06:55:25PM +0530, Viresh Kumar wrote: >> That's not completely true. There lies cpufreq directory in cpu/cpu*/ >> too, where we have per policy stuff in cpu/cpu*/, like policy tunables >> and stats. And the same is true for governor too. > > $ tree /sys/devices/system/cpu/cpu0/cpufreq/ > /sys/devices/system/cpu/cpu0/cpufreq/ > ├── affected_cpus > ├── bios_limit > ├── cpb > ├── cpuinfo_cur_freq > ├── cpuinfo_max_freq > ├── cpuinfo_min_freq > ├── cpuinfo_transition_latency > ├── related_cpus > ├── scaling_available_frequencies > ├── scaling_available_governors > ├── scaling_cur_freq > ├── scaling_driver > ├── scaling_governor > ├── scaling_max_freq > ├── scaling_min_freq > ├── scaling_setspeed > └── stats > ├── time_in_state > ├── total_trans > └── trans_table > > 1 directory, 19 files > > $ grep -r . /sys/devices/system/cpu/cpu0/cpufreq/* > /sys/devices/system/cpu/cpu0/cpufreq/affected_cpus:0 > /sys/devices/system/cpu/cpu0/cpufreq/bios_limit:4000000 > /sys/devices/system/cpu/cpu0/cpufreq/cpb:1 > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq:1400000 > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq:4000000 > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq:1400000 > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency:4000 > /sys/devices/system/cpu/cpu0/cpufreq/related_cpus:0 1 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:4000000 3400000 2800000 2100000 1400000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors:powersave userspace conservative ondemand perform > /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq:1400000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:acpi-cpufreq > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq:4000000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq:1400000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed:<unsupported> > /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state:4000000 3089328 > /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state:3400000 47448 > /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state:2800000 67185 > /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state:2100000 92731 > /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state:1400000 11416914 > /sys/devices/system/cpu/cpu0/cpufreq/stats/trans_table: From : To > /sys/devices/system/cpu/cpu0/cpufreq/stats/trans_table: : 4000000 3400000 2800000 2100000 140000 > /sys/devices/system/cpu/cpu0/cpufreq/stats/trans_table: 4000000: 0 34756 46388 53179 21824 > /sys/devices/system/cpu/cpu0/cpufreq/stats/trans_table: 3400000: 12938 0 3755 3555 1450 > /sys/devices/system/cpu/cpu0/cpufreq/stats/trans_table: 2800000: 19940 0 0 4547 2565 > /sys/devices/system/cpu/cpu0/cpufreq/stats/trans_table: 2100000: 18523 0 0 0 4275 > /sys/devices/system/cpu/cpu0/cpufreq/stats/trans_table: 1400000: 301168 0 0 0 > /sys/devices/system/cpu/cpu0/cpufreq/stats/total_trans:799918 > > Show me the policy tunables here. All files which are directly present in cpu/cpu*/cpufreq/ folder. I am not talking about governor tunables but policy tunables. Things like scaling_[min]max_freq are policy tunables. >> That was slightly confusing to me :( The whole governor directory >> is per policy, i have to keep that in cpu/cpu*/cpufreq instead of >> cpu/cpufreq. > > So make a /sys/devices/system/cpu/cpufreq/policies/ and add > functionality to assign cpus to policies or whatever the design of this > thing will be. Policies don't have a name associated with them and so cpu/cpufreq/policies doesn't make any sense. Rather one policy is related to multiple cpus and its tunables are linked in all the cpus that belong to it, like scaling_[min]max_freq. >> Its not only for multicluster system, but a system where multiple cpus >> have separate clock control and hence multiple policy structures. > > What are those systems? Examples? Don't have examples of these, but there can be few. Over that it is a must for multicluster systems as clusters normally have separate clock control. >> Problem with this is it would fail for single image solutions on which >> everybody is working on. So, with multiple platforms compiled into a >> single image, this wouldn't work. > > Single-image solutions will enable that config option and get built with > it - no problem at all. But then we will get governors tunables in cpu/cpu*/cpufreq/ instead of cpu/cpufreq/ . Will that not break userspace for other systems? -- 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/
Powered by blists - more mailing lists