[PATCH 1/2 v4] mieq: Provide better adaptability and diagnostics during mieq overflow

[Jeremy Huddleston]

On Oct 16, 2011, at 10:15 PM, Keith Packard wrote:

> On Sun, 16 Oct 2011 21:56:43 -0700, Jeremy Huddleston <jeremyhu at apple.com> wrote:
> 
>> n_events_at_tail ? I'm not really sure what to call it.
> 
> If I had a good idea, I would have suggested it :-) Perhaps just don't
> bother then, unless you have a sudden brain wave.
> 
>> It's not really any different.  I'm just doing an optimization
>> there... Rather than just setting everything to 0 individually, just
>> do one big memset.
> 
> See, it's a separate change from resizing the event queue.

But before this patch, doing the memset would probably not be an optimization.  It would be a waste mem writes.  The reason it makes sense to do it now is because events changed from a statically allocated array (which had all its elements initialized) to a pointer.