linux-kernel - Re: [PATCH] maximum latency tracking infrastructure (version 3)

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Message-ID: <44F3178F.8010508@linux.intel.com>
Date:	Mon, 28 Aug 2006 18:19:27 +0200
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Andreas Mohr <andi@...x01.fht-esslingen.de>
CC:	linux-kernel@...r.kernel.org, akpm@...l.org, mingo@...e.hu,
	jesse.barnes@...el.com, dwalker@...sta.com
Subject: Re: [PATCH] maximum latency tracking infrastructure (version 3)

Andreas Mohr wrote:
> Hi,
> 
> On Mon, Aug 28, 2006 at 05:48:00PM +0200, Arjan van de Ven wrote:
>> The proposed solution is to have an interface where drivers can
>> * announce the maximum latency (in microseconds) that they can deal with
>> * modify this latency
>> * give up their constraint
>> and a function where the code that decides on power saving strategy can query
>> the current global desired maximum.
> 
> Nifty (aka "dumb") idea: would it make sense to enable drivers to register a
> callback "we're going to go idle now" to e.g. let a driver refill or
> service its hardware buffers the very moment before idling? 

I could have sworn there was an idle call notifier already\

ah there is on x86-64 but it is architecture specific...
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