On 4 February 2016 at 23:09, Alan Stern [off-list ref] wrote:

On Thu, 4 Feb 2016, Ulf Hansson wrote:

quoted

I am really not questioning the autosuspend feature at all, it's a
really great feature!

Now, I question the minor benefit we actually gain from having the
runtime PM core to update the mark in rpm_resume().

As Tony pointed out, it prevents some devices from going to sleep right
away.

Because their drivers don't care to update the last busy mark!?

quoted

To me, the best decision when to update the mark is know by the
driver/subsystem for the device and not the core.

In most cases the mark will be updated after a request has been
completed, which leads to one unnecessary update at rpm_resume().

Sure, but that update is a simple assignment statement.  It's about as
cheap as you can get, short of doing nothing at all.

Valid point. I rest my case. :-)

Thanks for the discussion.

[...]

Kind regards
Uffe