[RFC weston 0/9] weston-debug protocol, API, and tool

[Pekka Paalanen]

On Thu, 22 Jun 2017 08:01:08 +0000
"Ucan, Emre (ADITG/ESB)" <eucan at de.adit-jv.com> wrote:

> Hello Pekka,
> 
> I think it is very hard do it in a generic way, because it is very
> dependent on the kernel and architecture. We are using systemtap in
> ADIT for similar purpose. You can add probe points without changing
> the binary which you are debugging.

Hi Emre,

I thought so, thanks for confirming.

I've also thought of new uses for weston-debug interface. The
weston_debug_scope_cb begin callback could ensure there is a timer
registered and from the timer callback print e.g. per-surface or
per-output rendering statistics. The timer would be torn down when it
fires and sees nothing is subscribed anymore.


Thanks,
pq

> > -----Original Message-----
> > From: Pekka Paalanen [mailto:ppaalanen at gmail.com]
> > Sent: Mittwoch, 21. Juni 2017 13:24
> > To: wayland-devel at lists.freedesktop.org
> > Cc: Ucan, Emre (ADITG/ESB)
> > Subject: Re: [RFC weston 0/9] weston-debug protocol, API, and tool
> > 
> > On Sat,  3 Jun 2017 14:57:02 +0300
> > Pekka Paalanen <ppaalanen at gmail.com> wrote:
> > Hi,
> > 
> > apropos, I have been entertaining a completely different idea: perf
> > probe.
> > 
> > Apparently one can set userspace probing points with 'perf probe'
> > and then record them, which should be less overhead when not used
> > than the weston-debug API. But there are many open questions I have
> > not had the time to chase:

..

> > I'm skeptical of this idea being useful, but thought I'd mention it
> > just in case. OTOH, the weston-debug proposal is relatively easy to
> > understand and use, and it should be very reliable, debug info or no.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 833 bytes
Desc: OpenPGP digital signature
URL: <https://lists.freedesktop.org/archives/wayland-devel/attachments/20170622/d4d0d850/attachment.sig>