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cpuidle: Add cpuidle.governor= command line parameter

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Add cpuidle.governor= command line parameter to allow the default
cpuidle governor to be replaced.

That is useful, for example, if someone running a tickful kernel
wants to use the menu governor on it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki
2018-12-05 23:45:34 +01:00
parent 800fb34a99
commit 61cb5758d3
5 changed files with 19 additions and 2 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@@ -674,6 +674,9 @@
cpuidle.off=1 [CPU_IDLE]
disable the cpuidle sub-system
cpuidle.governor=
[CPU_IDLE] Name of the cpuidle governor to use.
cpufreq.off=1 [CPU_FREQ]
disable the cpufreq sub-system

7
Documentation/admin-guide/pm/cpuidle.rst
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@@ -566,6 +566,13 @@ processors implementing the architecture (i.e. CPU instruction set) in question,
however, so it is rather crude and not very energy-efficient. For this reason,
it is not recommended for production use.
The ``cpuidle.governor=`` kernel command line switch allows the ``CPUIdle``
governor to use to be specified. It has to be appended with a string matching
the name of an available governor (e.g. ``cpuidle.governor=menu``) and that
governor will be used instead of the default one. It is possible to force
the ``menu`` governor to be used on the systems that use the ``ladder`` governor
by default this way, for example.
The other kernel command line parameters controlling CPU idle time management
described below are only relevant for the *x86* architecture and some of
them affect Intel processors only.