linux-kernel - Re: [RFC V1] cpuidle: add idle routine registration and cleanup pm

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Message-ID: <4CBF0C04.5070705@linux.intel.com>
Date:	Wed, 20 Oct 2010 17:34:28 +0200
From:	Andi Kleen <ak@...ux.intel.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
CC:	Trinabh Gupta <trinabh@...ux.vnet.ibm.com>,
	Venkatesh Pallipadi <venki@...gle.com>, peterz@...radead.org,
	lenb@...nel.org, suresh.b.siddha@...el.com,
	benh@...nel.crashing.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC V1] cpuidle: add idle routine registration and cleanup pm_idle
 pointer


> but now you're duplicating this functionality adding code for everyone.
>
> 99.999% of the people today run cpuidle... (especially embedded x86 
> where they really care about power)
> all x86 going forward also has > 1 idle option anyway.
>
> and you're adding and extra layer in the middle that just duplicates 
> the layer that's in use in practice above it.
>
> seriously, this sounds like the wrong tradeoff to make.

I think the right option is still to put cpuidle on a diet.
There's no reason an idle handler needs to be that bloated.

If it was 2K or so just including it into the core would be fine.

Ignoring code size completely is generally a wrong trade off imho.

-Andi
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