[RFC/PATCH 1/2] cpuidle: Allow idle-states to be disabled at start

Daniel Lezcano daniel.lezcano at linaro.org
Thu Aug 25 00:44:40 AEST 2016

On 08/19/2016 12:26 AM, Gautham R. Shenoy wrote:
> From: "Gautham R. Shenoy" <ego at linux.vnet.ibm.com>
> Currently all the idle states registered by a cpu-idle driver are
> enabled by default. This patch adds a mechanism which allows the
> driver to hint if an idle-state should start in a disabled state. The
> cpu-idle core will use this hint to appropriately initialize the
> usage->disable knob of the CPU device idle state.

Why do you need to do that ?

> The state can be enabled at run time by echo'ing a zero to the sysfs
> "disable" control file.

... for each cpu.

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