linux-kernel - Re: Runtime PM and the block layer

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Message-ID: <Pine.LNX.4.44L0.1008241708050.1652-100000@iolanthe.rowland.org>
Date:	Tue, 24 Aug 2010 17:09:03 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Jens Axboe <axboe@...nel.dk>
cc:	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Runtime PM and the block layer

On Tue, 24 Aug 2010, Jens Axboe wrote:

> > I see.  You're suggesting we add a new "power_mode" or "queue_idle"  
> > callback to the request_queue struct, and make the block layer invoke
> > this callback whenever a request completes and there are no other
> > requests pending or in flight.  Right?  And similarly, invoke the
> > callback (with a different argument) when the first request gets added
> > to an otherwise empty queue.
> > 
> > That would suit my needs.
> 
> Yep, that is what I'm suggesting.

All right, I'll work on this and get back to you when I need more help.  
Thanks for the advice.

Alan Stern

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