Fwd: unique id for wayland objects

zou lan nancy.lan.zou at gmail.com
Wed May 2 08:33:43 UTC 2018

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Hi pekka

I used to consider the time line and presentation protocol. But they are
all focus on surface, not buffer. The test want to know the buffer latency,
although they are the same as surface's on
most cases. Applications think maybe some buffers doesn't display and used

By the way, could add a event to wl_buffer's protocol achieve the
requirement? Thank you.

Best Regards

---------- Forwarded message ----------
From: Pekka Paalanen <ppaalanen at gmail.com>
Date: 2018-05-02 15:48 GMT+08:00
Subject: Re: unique id for wayland objects
To: zou lan <nancy.lan.zou at gmail.com>

On Wed, 2 May 2018 10:57:17 +0800
zou lan <nancy.lan.zou at gmail.com> wrote:

> Hi pekka
> I want to get the accurate buffer latency from a buffer commit by client
> display on the screen. The client can get the timestamp when buffer commit
> and release. So weston only need to give a
> timestamp when call on_pageflip.
> When do the real time analysis, there are many clients,  I want to use one
> unique id to distinguish from each other quickly.


is there any reason you don't use presentation_feedback interface? To
me it sounds like that would provide exactly what you need.


Also, could we have this coversation on the mailing list, please?

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