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| author | Ingo Molnar <mingo@elte.hu> | 2009-04-08 19:25:42 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-08 19:26:00 +0400 |
| commit | 5af8c4e0fac9838428bd718040b664043a05f37c (patch) | |
| tree | 75a01d98ed244db45fe3c734c4a81c1a3d92ac37 /Documentation/cpu-freq/user-guide.txt | |
| parent | 46e0bb9c12f4bab539736f1714cbf16600f681ec (diff) | |
| parent | 577c9c456f0e1371cbade38eaf91ae8e8a308555 (diff) | |
| download | linux-5af8c4e0fac9838428bd718040b664043a05f37c.tar.xz | |
Merge commit 'v2.6.30-rc1' into sched/urgent
Merge reason: update to latest upstream to queue up fix
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/cpu-freq/user-guide.txt')
| -rw-r--r-- | Documentation/cpu-freq/user-guide.txt | 28 |
1 files changed, 12 insertions, 16 deletions
diff --git a/Documentation/cpu-freq/user-guide.txt b/Documentation/cpu-freq/user-guide.txt index e3443ddcfb89..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 @@ -195,19 +207,3 @@ scaling_setspeed. By "echoing" a new frequency into this you can change the speed of the CPU, but only within the limits of scaling_min_freq and scaling_max_freq. - - -3.2 Deprecated Interfaces -------------------------- - -Depending on your kernel configuration, you might find the following -cpufreq-related files: -/proc/cpufreq -/proc/sys/cpu/*/speed -/proc/sys/cpu/*/speed-min -/proc/sys/cpu/*/speed-max - -These are files for deprecated interfaces to cpufreq, which offer far -less functionality. Because of this, these interfaces aren't described -here. - |