linux-kernel - [PATCH V4 0/11] sched: remove cpu

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Date:	Tue, 25 Feb 2014 09:50:43 +0800
From:	Alex Shi <alex.shi@...aro.org>
To:	mingo@...hat.com, peterz@...radead.org, morten.rasmussen@....com
Cc:	vincent.guittot@...aro.org, daniel.lezcano@...aro.org,
	fweisbec@...il.com, linux@....linux.org.uk, tony.luck@...el.com,
	fenghua.yu@...el.com, james.hogan@...tec.com, alex.shi@...aro.org,
	jason.low2@...com, viresh.kumar@...aro.org, hanjun.guo@...aro.org,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, pjt@...gle.com,
	fengguang.wu@...el.com, linaro-kernel@...ts.linaro.org,
	wangyun@...ux.vnet.ibm.com, mgorman@...e.de
Subject: [PATCH V4 0/11] sched: remove cpu_loads

The cpu_load decays on time according past cpu load of rq. The sched_avg 
also decays tasks' load on time. Now we has 2 kind decay for cpu_load. 
That is a kind of redundancy. And increase the system load by decay 
calculation. This patch try to remove the cpu_load decay.

There are 5 load_idx used for cpu_load in sched_domain. busy_idx and 
idle_idx are not zero usually, but newidle_idx, wake_idx and forkexec_idx 
are all zero on every arch. A shortcut to remove cpu_Load decay in the first
patch. just one line patch for this change. Then I try to clean up code 
followed by this change.

V4,
1, rebase on latest tip/master
2, replace target_load by biased_load as Morten's suggestion

V3,
1, correct the wake_affine bias. Thanks for Morten's reminder!
2, replace source_load by weighted_cpuload for better function name meaning.

V2,
1, This version do some tuning on load bias of target load.
2, Got further to remove the cpu_load in rq.
3, Revert the patch 'Limit sd->*_idx range on sysctl' since no needs

Any testing/comments are appreciated.

This patch rebase on latest tip/master.
The git tree for this patchset at:
 git@...hub.com:alexshi/power-scheduling.git noload

Thanks
Alex

 [PATCH 01/11] sched: shortcut to remove load_idx
 [PATCH 02/11] sched: remove rq->cpu_load[load_idx] array
 [PATCH 03/11] sched: clean up cpu_load update
 [PATCH 04/11] sched: unify imbalance bias for target group
 [PATCH 05/11] sched: rewrite update_cpu_load_nohz
 [PATCH 06/11] sched: clean up source_load/target_load
 [PATCH 07/11] sched: replace source_load by weighted_cpuload
 [PATCH 08/11] sched: replace target_load by biased_load
 [PATCH 09/11] sched: remove rq->cpu_load and rq->nr_load_updates
 [PATCH 10/11] sched: rename update_*_cpu_load
 [PATCH 11/11] sched: clean up task_hot function
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