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

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Message-Id: <201112151747.28366.trenn@suse.de>
Date:	Thu, 15 Dec 2011 17:47:28 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	Masanari Iida <standby24x7@...il.com>
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

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.

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.

Something to turn off intel_idle driver and favor the acpi_idle
driver for debugging would still be needed then.

   Thomas

> 
> Signed-off-by Masanari Iida <standby24x7@...il.com>
> cc:Len Brown <lenb@...nel.org>
> cc:Randy Dunlap <rdunlap@...otime.net>
> ---
>  Documentation/kernel-parameters.txt |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-
parameters.txt
> index 81c287f..c6a56d8 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1035,6 +1035,11 @@ bytes respectively. Such letter suffixes can also 
be entirely omitted.
>  			By default, super page will be supported if Intel IOMMU
>  			has the capability. With this option, super page will
>  			not be supported.
> +
> +	intel_idle.max_cstate=	[KNL,HW,ACPI,X86]
> +			0	disables intel_idle and fall back on acpi_idle.
> +			1 to 6	specify maximum depth of C-state.
> +
>  	intremap=	[X86-64, Intel-IOMMU]
>  			on	enable Interrupt Remapping (default)
>  			off	disable Interrupt Remapping
> -- 
> 1.7.6.4
> 
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