[Pixman] [RFC] Performance reporting capabilities for pixman?

[Siarhei Siamashka]

Hello all,

Let's face it, I think the end users rarely report performance problems in
pixman unless the performance is really notoriously bad (and not ignored
because "it's software rendering, so it is expected to be slow"). Finding real 
performance bottlenecks in pixman requires running a profiler and being able to
actually interpret its logs.

I wonder if it would make sense to add an extra configure option for the
special profiling enabled pixman build which would do:
1. Avoid caching fast path lookup failures
2. Once hitting slow path, record the type of operation, image color formats
and image flags.
3. For each unique slow path variant, accumulate the number of times it got
hit, the total number of (destination?) pixels which got processed, the total
number of scanlines.
4. Once per N minutes, spam into syslog with the current accumulated 
statistics.

If some use cases trigger a lot of pixman slow paths, cairo traces can be 
obtained for them.

-- 
Best regards,
Siarhei Siamashka
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: This is a digitally signed message part.
URL: <http://lists.freedesktop.org/archives/pixman/attachments/20100927/478611ab/attachment.pgp>