linux-kernel - Re: [patch v5 11/15] sched: add power/performance balance allow flag

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Date:	Wed, 20 Feb 2013 10:48:01 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alex Shi <alex.shi@...el.com>
Cc:	torvalds@...ux-foundation.org, mingo@...hat.com,
	tglx@...utronix.de, akpm@...ux-foundation.org,
	arjan@...ux.intel.com, bp@...en8.de, pjt@...gle.com,
	namhyung@...nel.org, efault@....de, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
	morten.rasmussen@....com
Subject: Re: [patch v5 11/15] sched: add power/performance balance allow flag

On Mon, 2013-02-18 at 13:07 +0800, Alex Shi wrote:
> @@ -4053,6 +4053,8 @@ struct lb_env {
>         unsigned int            loop;
>         unsigned int            loop_break;
>         unsigned int            loop_max;
> +       int                     power_lb;  /* if power balance needed
> */
> +       int                     perf_lb;   /* if performance balance
> needed */
>  };
>  
>  /*
> @@ -5195,6 +5197,8 @@ static int load_balance(int this_cpu, struct rq
> *this_rq,
>                 .idle           = idle,
>                 .loop_break     = sched_nr_migrate_break,
>                 .cpus           = cpus,
> +               .power_lb       = 0,
> +               .perf_lb        = 1,
>         };
>  
>         cpumask_copy(cpus, cpu_active_mask);

This construct allows for the possibility of power_lb=1,perf_lb=1, does
that make sense? Why not have a single balance_policy enumeration?

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