Re: [RFC] Support for events with a large payload

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

On Wednesday 03 July 2013 02:01:59 Sakari Ailus wrote:
> On Mon, Jun 24, 2013 at 03:40:14PM +0200, Hans Verkuil wrote:
> ...
> 
> > Since the payloads are larger I am less concerned about speed. There is
> > one problem, though: if you dequeue the event and the buffer that should
> > receive the payload is too small, then you have lost that payload. You
> > can't allocate a new, larger, buffer and retry. So this approach can only
> > work if you really know the maximum payload size.
> > 
> > The advantage is also that you won't lose payloads.
> 
> Forgot to answer this one --- I think it's fair to assume the user knows the
> maximum size of the payload. What we also could do in such a case is to
> return the error (e.g. ENOSPC) and put the required size to the large event
> size field. But first someone must come up with a variable size event
> without well defined maximum size for this to make much sense.

And while we're discussing use cases, Hans, what are you current use cases for 
>64 bytes event payloads ?

-- 
Regards,

Laurent Pinchart