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

Matthew Garrett
2009-11-23T14:13:06Z

On Mon, Nov 23, 2009 at 12:37:49AM +0100, Pavel Machek wrote:
> On Wed 2009-11-18 20:07:12, Matthew Garrett wrote:
> > On Wed, Nov 18, 2009 at 09:03:21PM +0100, Kay Sievers wrote:
> >
> > > Sure, but what's wrong with reading that file every 50 seconds? Almost
> > > all boxes poll for media changes of optical drives and usb card
> > > readers anyway, so it's not that we are not doing stuff like this
> > > already.
> >
> > We poll for media because there's no event-based way of avoiding it - in
> > this case there is.
>
> ...when you add overhead to every disk operation. I'd say that polling
> once in 50 seconds is preferable to that.

Yeah, but 50 seconds isn't the timescale we're talking about here.

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