linux-kernel - Re: [PATCH] ACPI: kernel-parameters.txt : Add intel_idle.max

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Message-ID: <CALLJCT3hwYhCzrqbfeXG-C4t+PTG8fu_uJP=+S3H=tt4yX+D9w@mail.gmail.com>
Date:	Fri, 16 Dec 2011 13:21:28 +0900
From:	Masanari Iida <standby24x7@...il.com>
To:	Thomas Renninger <trenn@...e.de>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	rdunlap@...otime.net, lenb@...nel.org
Subject: Re: [PATCH] ACPI: kernel-parameters.txt : Add intel_idle.max_cstate

2011/12/16 Thomas Renninger <trenn@...e.de>:
> On Wednesday, December 14, 2011 05:18:52 PM Masanari Iida wrote:
>> Add missing intel_idle.max_cstate in kernel-parameters.txt
> I wonder whether this one should get documented at all.
>
My opinion is, as long as the kernel parameter is available,
we should document it.  And if developer want to guide the user to use
cpuidle.max_cstate, we should document so.

> Better would be to work towards a general cpuidle.max_state=
> param which deprecates processor.max_cstate= (acpi_idle driver) and
> intel_idle.max_cstate= and enables this functionality for all
> other cpuidle drivers out there as well.
>
cpuidle.max_state is also not in the kernel-parameters.txt,
Separate patch need to be created.

> Something to turn off intel_idle driver and favor the acpi_idle
> driver for debugging would still be needed then.
>
This patch explains how to disable intel_idle.
Although processor.max_cstate=0 sets cstate to 0,
but similar option intel_idle.max_cstate=0 didn't set cstate to 0.
This is confusing for the users.
This is the reason why I wanted to document it.

Masanari Iida
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