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

From	Balbir Singh <bsingharora@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [RFC/PATCH 1/2] cpuidle: Allow idle-states to be disabled at start
Date	2016-08-25 15:50 +0200
Message-ID	<sa3cB-1AH-15@gated-at.bofh.it> (permalink)
References	<s7GWR-7sc-17@gated-at.bofh.it> <s7GWR-7sc-15@gated-at.bofh.it> <s9HF7-3BB-17@gated-at.bofh.it> <s9HOO-3F4-27@gated-at.bofh.it> <s9HYu-3Yy-43@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 25/08/16 01:06, Daniel Lezcano wrote:
> On 08/24/2016 04:48 PM, Balbir Singh wrote:
>>
>>
>> On 25/08/16 00:44, Daniel Lezcano wrote:
>>> On 08/19/2016 12:26 AM, Gautham R. Shenoy wrote:
>>>> From: "Gautham R. Shenoy" <ego@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 ?
>>>
>>
>> I think patch 2/2 explains the reason as it uses this infrastructure
> 
> Ok, let me elaborate the question, I was not clear.
> 
> Why the userspace can't setup the system environment at boot time by
> disabling the state instead of adding extra code to disable it at boot
> time in the kernel and then re-enable it from userspace ?

Gautham's patches don't want to have those states enabled by default.
They are unlikely to be what production systems need, but likely
what a knowledgeable person can look into selectively enable for
experimentation.

@Gautham?


Balbir Singh.

Thread

[RFC/PATCH 1/2] cpuidle: Allow idle-states to be disabled at start "Gautham R. Shenoy" <ego@linux.vnet.ibm.com> - 2016-08-19 03:40 +0200
  Re: [RFC/PATCH 1/2] cpuidle: Allow idle-states to be disabled at  start Daniel Lezcano <daniel.lezcano@linaro.org> - 2016-08-24 16:50 +0200
    Re: [RFC/PATCH 1/2] cpuidle: Allow idle-states to be disabled at  start Balbir Singh <bsingharora@gmail.com> - 2016-08-24 17:00 +0200
      Re: [RFC/PATCH 1/2] cpuidle: Allow idle-states to be disabled at  start Daniel Lezcano <daniel.lezcano@linaro.org> - 2016-08-24 17:10 +0200
        Re: [RFC/PATCH 1/2] cpuidle: Allow idle-states to be disabled at  start Balbir Singh <bsingharora@gmail.com> - 2016-08-25 15:50 +0200
          Re: [RFC/PATCH 1/2] cpuidle: Allow idle-states to be disabled at  start Daniel Lezcano <daniel.lezcano@linaro.org> - 2016-08-25 16:20 +0200

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