linux-kernel - Re: [patch v3 0/8] sched: use runnable avg in load balance

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Date:	Wed, 03 Apr 2013 15:28:27 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
CC:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, bp@...en8.de,
	pjt@...gle.com, namhyung@...nel.org, efault@....de,
	morten.rasmussen@....com, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
	len.brown@...el.com, rafael.j.wysocki@...el.com, jkosina@...e.cz,
	clark.williams@...il.com, tony.luck@...el.com,
	keescook@...omium.org, mgorman@...e.de, riel@...hat.com
Subject: Re: [patch v3 0/8] sched: use runnable avg in load balance

On 04/03/2013 03:18 PM, Michael Wang wrote:
>> > the following patch include the renamed knob, and you can tune it under 
>> > /proc/sys/kernel/... to see detailed impact degree.
> Could I make the conclusion that the improvement on pgbench was caused
> by the new weighted_cpuload()?

guess too.
> 
> The burst branch seems to just adopt the load in old world, if reduce
> the rate to enter that branch could regain the benefit, then I could
> confirm my supposition.
> 
>> > 
>> > +	if (cpu_rq(this_cpu)->avg_idle < sysctl_sched_migration_cost ||
>> > +		cpu_rq(prev_cpu)->avg_idle < sysctl_sched_migration_cost)
> It should be 'sysctl_sched_burst_threshold' here, isn't it? anyway, I
> will take a try with different rate.

Ops, sth wrong in my git operation.

-- 
Thanks Alex
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