linux-kernel - Re: [v7 PATCH 0/7]: cpuidle/x86/POWER: Cleanup idle power management code in x86, cleanup drivers/cpuidle/cpuidle.c and introduce cpuidle to POWER.

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Date:	Tue, 6 Oct 2009 22:05:21 +0530
From:	Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Joel Schopp <jschopp@...tin.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Arun Bharadwaj <arun@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-arch@...r.kernel.org
Subject: Re: [v7 PATCH 0/7]: cpuidle/x86/POWER: Cleanup idle power
	management code in x86, cleanup drivers/cpuidle/cpuidle.c and
	introduce cpuidle to POWER.

* Arun R Bharadwaj <arun@...ux.vnet.ibm.com> [2009-10-06 20:54:21]:

> Hi
> 
> Please consider this for inclusion into the testing tree.
> 
> This patchset introduces cpuidle infrastructure to POWER, prototyping
> for pSeries, and also does a major refactoring of current x86 idle
> power management and a cleanup of cpuidle infrastructure.
> 
> Earlier discussions on the same can be found at:
> 
> v6 --> http://lkml.org/lkml/2009/9/22/180
> v5 --> http://lkml.org/lkml/2009/9/22/26
> v4 --> http://lkml.org/lkml/2009/9/1/133
> v3 --> http://lkml.org/lkml/2009/8/27/124
> v2 --> http://lkml.org/lkml/2009/8/26/233
> v1 --> http://lkml.org/lkml/2009/8/19/150
> 
> 
> Changes in this version:
> -----------------------------------------
> 
> * Earlier implementation maintained a list of cpuidle devices and
>   the list was traversed to disable and enable the cpuidle devices
>   when switching governors. This list is not necessary and is removed.
>   Now, we get the per cpu structure cpuidle_devices and disable and
>   enable it for each online cpu while switching governors.
> 
> * Earlier iterations were buggy w.r.t the sysfs interface of the cpuidle.
>   This iteration removes the bug in PATCH 1/7.
> 
> * In PATCH 7/7, smt_snooze_delay was not being updated whenever it was
>   changed through the sysfs interface. Provide a helper routine to
>   update it.
> 
> * In PATCH 7/7, the idle loops are renamed to denote the idle states
>   to avoid any confusion.
> 

Also, the per-cpu nature of registration/unregistration of cpuidle
has been maintained as ACPI needs this.

> 
> thanks,
> arun
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