linux-kernel - Re: [PATCH V5 3/8] sched: remove source_load and target

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Date:	Thu, 24 Apr 2014 16:18:26 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alex Shi <alex.shi@...aro.org>
Cc:	mingo@...hat.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org, daniel.lezcano@...aro.org,
	efault@....de, wangyun@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, mgorman@...e.de
Subject: Re: [PATCH V5 3/8] sched: remove source_load and target_load

On Wed, Apr 16, 2014 at 10:43:24AM +0800, Alex Shi wrote:
> We have no load_idx any more, so source/target_load always return the
> same value as weighted_cpuload. So we can remove these 2 functions.

That's just not true:

> -/*
> - * Return a low guess at the load of a migration-source cpu weighted
> - * according to the scheduling class and "nice" value.
> - *
> - * We want to under-estimate the load of migration sources, to
> - * balance conservatively.
> - */
> -static unsigned long source_load(int cpu)
> -{
> -	struct rq *rq = cpu_rq(cpu);
> -	unsigned long total = weighted_cpuload(cpu);
> -
> -	if (!sched_feat(LB_BIAS))
> -		return total;
> -
> -	return min(rq->cpu_load, total);
> -}
> -
> -/*
> - * Return a high guess at the load of a migration-target cpu weighted
> - * according to the scheduling class and "nice" value.
> - */
> -static unsigned long target_load(int cpu)
> -{
> -	struct rq *rq = cpu_rq(cpu);
> -	unsigned long total = weighted_cpuload(cpu);
> -
> -	if (!sched_feat(LB_BIAS))
> -		return total;
> -
> -	return max(rq->cpu_load, total);
> -}


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