diff options
| author |   Matthew Garrett <mjg@redhat.com> | 2008-11-25 13:29:47 -0500 |
|---|---|---|
| committer |   Dave Jones <davej@redhat.com> | 2008-12-05 15:20:10 -0500 |
| commit | e088e4c9cdb618675874becb91b2fd581ee707e6 (patch) | |
| tree | 48231c406061308502f13c7781a6957ef396a739 /include/linux/cpufreq.h | |
| parent | [CPUFREQ] p4-clockmod: reduce noise (diff) | |
| download | linux-dev-e088e4c9cdb618675874becb91b2fd581ee707e6.tar.xz linux-dev-e088e4c9cdb618675874becb91b2fd581ee707e6.zip | |
[CPUFREQ] Disable sysfs ui for p4-clockmod.
p4-clockmod has a long history of abuse. It pretends to be a CPU
frequency scaling driver, even though it doesn't actually change
the CPU frequency, but instead just modulates the frequency with
wait-states.
The biggest misconception is that when running at the lower 'frequency'
p4-clockmod is saving power. This isn't the case, as workloads running
slower take longer to complete, preventing the CPU from entering deep C states.
However p4-clockmod does have a purpose. It can prevent overheating.
Having it hooked up to the cpufreq interfaces is the wrong way to achieve
cooling however. It should instead be hooked up to ACPI.
This diff introduces a means for a cpufreq driver to register with the
cpufreq core, but not present a sysfs interface.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'include/linux/cpufreq.h')
| -rw-r--r-- | include/linux/cpufreq.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 1ee608fd7b77..484b3abf61bb 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -234,6 +234,7 @@ struct cpufreq_driver { int (*suspend) (struct cpufreq_policy *policy, pm_message_t pmsg); int (*resume) (struct cpufreq_policy *policy); struct freq_attr **attr; + bool hide_interface; }; /* flags */ |