linux-kernel - Re: [PATCH] [RFC] Add support for uevents on block device idle changes

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Date:	Thu, 19 Nov 2009 14:30:08 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	David Zeuthen <david@...ar.dk>, linux-kernel@...r.kernel.org,
	axboe@...nel.dk, linux-hotplug@...r.kernel.org
Subject: Re: [PATCH] [RFC] Add support for uevents on block device idle
	changes

On Thu, Nov 19, 2009 at 03:25:59PM +0100, Kay Sievers wrote:
> On Thu, Nov 19, 2009 at 15:16, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> > It could, but it seems a bit of a hack. It'd still also require the
> > timer to be in the kernel, so we might as well expose that to userspace.
> 
> Sure, but a userspace configurable policy for an in-kernel disk-idle
> powermanagent sounds fine, compared to a single-subscriber
> userspace-only disk-idle event interface. :)

Well, we still need to expose this for the access pattern modifying. I 
really don't see the issue with the single subscriber being devkit-disks 
- none of the operations involved are atomic, so we're inherently racy 
here.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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