linux-kernel - Re: [RFC] maximum latency tracking infrastructure

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Date:	Thu, 24 Aug 2006 14:52:29 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, len.brown@...el.com
Subject: Re: [RFC] maximum latency tracking infrastructure

On Thu, 2006-08-24 at 19:41 +0200, Arjan van de Ven wrote:
> Subject: [RFC] maximum latency tracking infrastructure
> From: Arjan van de Ven <arjan@...ux.intel.com>
> 
> The patch below adds infrastructure to track "maximum allowable latency" for power
> saving policies.
> 
> The reason for adding this infrastructure is that power management in the
> idle loop needs to make a tradeoff between latency and power savings (deeper
> power save modes have a longer latency to running code again). 
> The code that today makes this tradeoff just does a rather simple algorithm;

I was just thinking that it might be cleaner to register a structure
instead of tracking identifiers to usecs. You might get a speed up on
some of the operations, like unregister.

Another thing I was thinking about is that this seems somewhat contrary
to the idea of using dynamic tick (assuming it was in mainline) to
heuristically pick a power state. Do you have any thoughts on how you
would combine the two?

Daniel

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