Messages in this thread | | | Date | Tue, 23 Jun 2020 15:21:36 +0100 | Subject | [PATCH v2 0/2] cpufreq: Specify the default governor on command line | From | Quentin Perret <> |
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This series enables users of prebuilt kernels (e.g. distro kernels) to specify their CPUfreq governor of choice using the kernel command line, instead of having to wait for the system to fully boot to userspace to switch using the sysfs interface. This is helpful for 2 reasons: 1. users get to choose the governor that runs during the actual boot; 2. it simplifies the userspace boot procedure a bit (one less thing to worry about).
To enable this, the first patch moves all governor init calls to core_initcall, to make sure they are registered by the time the drivers probe. This should be relatively low impact as registering a governor is a simple procedure (it gets added to a llist), and all governors already load at core_initcall anyway when they're set as the default in Kconfig. This also allows to clean-up the governors' init/exit code, and reduces boilerplate.
The second patch introduces the new command line parameter, inspired by its cpuidle counterpart. More details can be found in the respective patch headers.
Changes in v2: - added Viresh's ack to patch 01 - moved the assignment of 'default_governor' in patch 02 to the governor registration path instead of the driver registration (Viresh)
Thanks, Quentin
Quentin Perret (2): cpufreq: Register governors at core_initcall cpufreq: Specify default governor on command line
.../admin-guide/kernel-parameters.txt | 5 ++++ Documentation/admin-guide/pm/cpufreq.rst | 6 ++--- .../platforms/cell/cpufreq_spudemand.c | 26 ++----------------- drivers/cpufreq/cpufreq.c | 23 ++++++++++++---- drivers/cpufreq/cpufreq_conservative.c | 22 ++++------------ drivers/cpufreq/cpufreq_ondemand.c | 24 +++++------------ drivers/cpufreq/cpufreq_performance.c | 14 ++-------- drivers/cpufreq/cpufreq_powersave.c | 18 +++---------- drivers/cpufreq/cpufreq_userspace.c | 18 +++---------- include/linux/cpufreq.h | 14 ++++++++++ kernel/sched/cpufreq_schedutil.c | 6 +---- 11 files changed, 62 insertions(+), 114 deletions(-)
-- 2.27.0.111.gc72c7da667-goog
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