[PATCH V3 0/10] sched: remove cpu_load

[Alex Shi]

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.

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@xxxxxxxxxx:alexshi/power-scheduling.git noload

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