linux-kernel - [v6 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, 22 Sep 2009 16:55:27 +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>,
	Shaohua Li <shaohua.li@...el.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
Subject: [v6 PATCH 0/7]: cpuidle/x86/POWER: Cleanup idle power management
	code in x86, cleanup drivers/cpuidle/cpuidle.c and introduce
	cpuidle to POWER.

Hi,

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.

My earlier iterations can be found at:

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:
------------------------------------------
Remove the bug from previous iteration in the routine
cpuidle_remove_from_list(), which was causing the kernel to panic on
platform supporting multiple sleep states.

Add the routine cpuidle_kick_cpus() in POWER, which is needed to kick
the cpus out of their idle when changing the idle routines.

TODO:
-------------------------------------------
Peterz suggested it would be nice to have a sysfs interface through
which an idle routine can be forced at runtime.

Also, current implementation registers every cpu as a cpuidle_device,
but this is an overkill and the registering mechanism should be a
systemwide process and not per-cpu. (probably one of the original
cpuidle authors can reply to this - Venki, Shaohua Li? ).

ppc_md.power_save has been replaced by cpuidle_idle_call only for
pseries. So this needs to be done for all POWER platforms so that
ppc_md.power_save is completely removed.

Any comments on the design is welcome.

--arun
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