linux-kernel - Re: [PATCH v2 0/11] remove cpu

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Date:	Tue, 18 Feb 2014 14:03:35 +0800
From:	Alex Shi <alex.shi@...aro.org>
To:	Michael wang <wangyun@...ux.vnet.ibm.com>, 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, 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
Subject: Re: [PATCH v2 0/11] remove cpu_load in rq

On 02/18/2014 12:52 PM, Michael wang wrote:
> On 02/17/2014 09:55 AM, Alex Shi wrote:
>> 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.
>>
>> V2,
>> 1, This version do some tuning on load bias of target load, to maximum match current code logical.
>> 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.
> 
> Tested on 12-cpu-x86 box with tip/master, ebizzy and hackbench
> works fine, show little improvements for each time's testing.

Thanks a lot for your data!
> 
> 
> BTW, I got panic while rebooting, but should not caused by
> this patch set, will recheck and post the report later.
> 

I reviewed my patch again. Also didn't find suspicious line for the
following rcu stall.  Will wait for your report. :)
> 

-- 
Thanks
    Alex
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