linux-kernel - [PATCH 0/1 v2] cpuidle: allow to disable C states of the ladder governor

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Date:	Thu, 19 Jul 2012 20:52:12 +0200
From:	Carsten Emde <C.Emde@...dl.org>
To:	Rafael Wysocki <rjw@...k.pl>
Cc:	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>,
	Len Brown <len.brown@...el.com>, Kevin Hilman <khilman@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	Carsten Emde <C.Emde@...dl.org>
Subject: [PATCH 0/1 v2] cpuidle: allow to disable C states of the ladder governor

Rafael,

>>>>>> [..]
>>>>>> I could implement a sanitize mechanism of the ladder governor that
>>>>>> takes care the "disable" variables of all deeper states are set to 1,
>>>>>> if a state is disabled, and those of all lighter states are set to 0,
>>>>>> if a state is enabled. Do you wish me to do that?
>>>>> No, I dont think thats necessary, current code suffices it.
>>>>> The disable flag is knob we are giving to the user . So may be just
>>>>> document  the  intended use of disable flag working
>>>>> alongside design of ladder governor.
>>>> It's not necessary - but maybe better. Here comes v3 with a sanitizer.
>>>> Is this too ugly?
>>> The v2, with the documentation in place seems sufficient.
>>> Yup, this adds unnecessary fields which are not much use
>>> coz the same can be achieved with just disable flag check.
>> ok, let's take v2.
> Can you please resend the version regarded as the current one?

This is the version that was regarded as the current one (v2).

Changes in v2: A note in the documentation explains why the sysfs
variable "disable" may not always reflect the current situation
and why modifying it may not always work as expected.

	-Carsten.

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