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| author | Ingo Molnar <mingo@elte.hu> | 2009-03-28 22:27:45 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-28 22:27:45 +0100 |
| commit | 3fab191002b184e4390aa07c7149c6cc7b638ec7 (patch) | |
| tree | 821382d49e47c19531bfc3bb9e1f8922486374d4 /Documentation/cpu-freq/user-guide.txt | |
| parent | Merge branches 'x86/apic', 'x86/cleanups' and 'x86/mm' into x86/core (diff) | |
| parent | Merge branch 'percpu-cpumask-x86-for-linus-2' of git://git.kernel.org/pub/scm... (diff) | |
| download | linux-3fab191002b184e4390aa07c7149c6cc7b638ec7.tar.xz linux-3fab191002b184e4390aa07c7149c6cc7b638ec7.zip | |
Merge branch 'linus' into x86/core
Diffstat (limited to 'Documentation/cpu-freq/user-guide.txt')
| -rw-r--r-- | Documentation/cpu-freq/user-guide.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/cpu-freq/user-guide.txt b/Documentation/cpu-freq/user-guide.txt index 917918f84fc7..75f41193f3e1 100644 --- a/Documentation/cpu-freq/user-guide.txt +++ b/Documentation/cpu-freq/user-guide.txt @@ -152,6 +152,18 @@ cpuinfo_min_freq : this file shows the minimum operating frequency the processor can run at(in kHz) cpuinfo_max_freq : this file shows the maximum operating frequency the processor can run at(in kHz) +cpuinfo_transition_latency The time it takes on this CPU to + switch between two frequencies in nano + seconds. If unknown or known to be + that high that the driver does not + work with the ondemand governor, -1 + (CPUFREQ_ETERNAL) will be returned. + Using this information can be useful + to choose an appropriate polling + frequency for a kernel governor or + userspace daemon. Make sure to not + switch the frequency too often + resulting in performance loss. scaling_driver : this file shows what cpufreq driver is used to set the frequency on this CPU |