unique id for wayland objects

[zou lan]

Hi pekka

I'm not familiar with kernel. I know part of drm driver is implement by
ourself. I check the vblank callback function, it sends pageflip event
first if there is a frame complete, update vblank timestamp later.

I don't know why the owner write code like this. but if I swap the code
order, the fps  decrease a lot.
I can sure this impact the weston's page flip timestamp. Does this have
some impacts to weston except timeline?

I study a little about timeline, I think the picture could still show the
c2p(interval between damage commit and hit screen). Is it right? Thank you.

Best Regards
Nancy

2018-05-24 15:42 GMT+08:00 Pekka Paalanen <ppaalanen at gmail.com>:

> On Thu, 24 May 2018 15:26:23 +0800
> zou lan <nancy.lan.zou at gmail.com> wrote:
>
> > Hi pekka
> >
> > >>are the c2p numbers from weston-presentation-shm demo?
> > yes. I use this demo. My clock is  CLOCK_MONOTONIC.
> >
> > I check the drm kernel code, I find each vblank event send the last
> > vblank's timestamp.
> >
> > system time                             sec  msec
> > [  263.000526] vblank_event  262  983
> > [  263.017236] vblank_event 263    0
> > [  263.033864] vblank_event  263   17
> > [  263.050533] vblank_event  263    33
> > [  263.067215] vblank_event  263    50
> >
> > I think that's should be the main reason cause the c2p time weird. I
> don't
> > know why kernel return last frame's timestamp. I am still debuging it.
>
> Indeed, that does not sound right. Maybe contact the driver developers
> about this?
>
> Which kernel display driver are you using?
>
>
> Thanks,
> pq
>
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