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

Matthew Garrett
2009-11-18T19:41:00Z

On Wed, Nov 18, 2009 at 08:30:07PM +0100, Kay Sievers wrote:

> Wouldn't it be good enough, if we add a file "idle_since" which
> contains the time of the actual disk idle time, and userspace can
> schedule a re-examination of that value at the actual end of the idle
> time it is looking for?

That would require either polling or waking up a userspace application
on every disk access. Doing it in-kernel involves only a single timer
wakeup for every active/idle transition.

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