Hi,<br><br>On Wednesday, March 25, 2015, Dave Airlie <<a href="mailto:airlied@gmail.com">airlied@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 25 March 2015 at 08:50, Daniel Stone <<a href="javascript:;" onclick="_e(event, 'cvml', 'daniel@fooishbar.org')">daniel@fooishbar.org</a>> wrote:<br>
> I'm not going to lie, I was really hoping the 5th (?) GPU option for<br>
> Qemu would support pageflipping. Daniel's comment about conversion to<br>
> atomic is relevant, but: do you have a mechanism which allows you to<br>
> post updates (e.g. 'start displaying this buffer now please') that<br>
> allows you to get events back when they have actually been displayed?<br>
<br>
Page flip is implemented in a later patch,<br>
<br>
<a href="https://www.kraxel.org/cgit/linux/commit/?h=virtio-gpu&id=1e167e8e964f8e08100d315dd354cc0a4b090841" target="_blank">https://www.kraxel.org/cgit/linux/commit/?h=virtio-gpu&id=1e167e8e964f8e08100d315dd354cc0a4b090841</a><br>
<br>
Since its a long way from an actual display, finding out when<br>
something is actually displayed is hard,<br>
but when we've posted it to the frontbuffer should be fine.<br>
</blockquote><div><br></div><div>Oh nice. 100% exact timings aren't critical; it's more just having something to gate to 60fps that we can actually drive Weston's repaint loop off, as that's (not unreasonably) driven by pageflip events.</div><div><br></div><div>Cheers,</div><div>Daniel<span></span></div>