linux-kernel - Re: [RFC][PATCH 8/9] sched: power: Add initial frequency scaling support to power scheduler

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Date:	Wed, 10 Jul 2013 06:10:59 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Morten Rasmussen <morten.rasmussen@....com>
CC:	mingo@...nel.org, peterz@...radead.org, vincent.guittot@...aro.org,
	preeti@...ux.vnet.ibm.com, alex.shi@...el.com, efault@....de,
	pjt@...gle.com, len.brown@...el.com, corbet@....net,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	tglx@...utronix.de, catalin.marinas@....com,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org
Subject: Re: [RFC][PATCH 8/9] sched: power: Add initial frequency scaling
 support to power scheduler

On 7/9/2013 8:55 AM, Morten Rasmussen wrote:
> Extends the power scheduler capacity management algorithm to handle
> frequency scaling and provide basic frequency/P-state selection hints
> to the power driver.
>
> Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
> CC: Ingo Molnar <mingo@...nel.org>
> CC: Peter Zijlstra <peterz@...radead.org>
> CC: Catalin Marinas <catalin.marinas@....com>
> ---
>   kernel/sched/power.c |   33 ++++++++++++++++++++++++++++-----
>   1 file changed, 28 insertions(+), 5 deletions(-)
>
> diff --git a/kernel/sched/power.c b/kernel/sched/power.c
> index 9e44c0e..5fc32b0 100644
> --- a/kernel/sched/power.c
> +++ b/kernel/sched/power.c
> @@ -21,6 +21,8 @@
>
>   #define INTERVAL 5 /* ms */
>   #define CPU_FULL 90 /* Busy %-age - TODO: Make tunable */
> +#define CPU_TARGET 80 /* Target busy %-age - TODO: Make tunable */
> +#define CPU_EMPTY 5 /* Idle noise %-age - TODO: Make tunable */
>

to be honest, this is the policy part that really should be in the hardware specific driver
and not in the scheduler.
(even if said driver is sort of a "generic library" kind of thing)



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