linux-kernel - Re: [PATCH 0/18] sched: simplified fork, enable load average into LB and power awareness scheduling

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Date:	Tue, 11 Dec 2012 08:51:40 +0800
From:	Alex Shi <lkml.alex@...il.com>
To:	Alex Shi <alex.shi@...el.com>
Cc:	rob@...dley.net, mingo@...hat.com, peterz@...radead.org,
	gregkh@...uxfoundation.org, andre.przywara@....com, rjw@...k.pl,
	paul.gortmaker@...driver.com, akpm@...ux-foundation.org,
	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	pjt@...gle.com, vincent.guittot@...aro.org,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 0/18] sched: simplified fork, enable load average into LB
 and power awareness scheduling

On Mon, Dec 10, 2012 at 4:22 PM, Alex Shi <alex.shi@...el.com> wrote:
> This patchset base on tip/sched/core tree temporary, since it is more
> steady than tip/master. and it's easy to rebase on tip/master.
>
> It includes 3 parts changes.
>
> 1, simplified fork, patch 1~4, that simplified the fork/exec/wake log in
> find_idlest_group and select_task_rq_fair. it can increase 10+%
> hackbench process and thread performance on our 4 sockets SNB EP machine.
>
> 2, enable load average into LB, patch 5~9, that using load average in
> load balancing, with a runnable load value industrialization bug fix and
> new fork task load contrib enhancement.
>
> 3, power awareness scheduling, patch 10~18,
> Defined 2 new power aware policy balance and
> powersaving, and then try to spread or shrink tasks on CPU unit
> according the different scheduler policy. That can save much power when
> task number in system is no more then cpu number.

tried with sysbench fileio test rndrw mode, with half thread of LCPU number,
performance is similar, power can save about 5~10 Watts on 2 sockets SNB EP
and NHM EP boxes.

Any comments :)
>
> Any comments are appreciated!
>
> Best regards!
> Alex
>
> [PATCH 01/18] sched: select_task_rq_fair clean up
> [PATCH 02/18] sched: fix find_idlest_group mess logical
> [PATCH 03/18] sched: don't need go to smaller sched domain
> [PATCH 04/18] sched: remove domain iterations in fork/exec/wake
> [PATCH 05/18] sched: load tracking bug fix
> [PATCH 06/18] sched: set initial load avg of new forked task as its
> [PATCH 07/18] sched: compute runnable load avg in cpu_load and
> [PATCH 08/18] sched: consider runnable load average in move_tasks
> [PATCH 09/18] Revert "sched: Introduce temporary FAIR_GROUP_SCHED
> [PATCH 10/18] sched: add sched_policy in kernel
> [PATCH 11/18] sched: add sched_policy and it's sysfs interface
> [PATCH 12/18] sched: log the cpu utilization at rq
> [PATCH 13/18] sched: add power aware scheduling in fork/exec/wake
> [PATCH 14/18] sched: add power/performance balance allowed flag
> [PATCH 15/18] sched: don't care if the local group has capacity
> [PATCH 16/18] sched: pull all tasks from source group
> [PATCH 17/18] sched: power aware load balance,
> [PATCH 18/18] sched: lazy powersaving balance
> --
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