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

Matthew Garrett
2009-11-19T14:30:14Z

On Thu, Nov 19, 2009 at 03:25:59PM +0100, Kay Sievers wrote:
> On Thu, Nov 19, 2009 at 15:16, Matthew Garrett <mjg59@srcf.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@srcf.ucam.org