• Pekka Paalanen's avatar
    compositor: Implement JSON-timeline logging · b502654b
    Pekka Paalanen authored
    Logging is activated and deactivated with the debug key binding 't'.
    When activated, it creates a new log file, where it records the events.
    The log file contains events and detailed object information entries in
    JSON format, and is meant to be parsed in sequence from beginning to the
    end.
    
    The emitted events are mostly related to the output repaint cycle, like
    when repaint begins, is submitted to GPU, and when it completes on a
    vblank. This is recorded per-output. Also some per-surface events are
    recorded, including when surface damage is flushed.
    
    To reduce the log size, events refer to objects like outputs and
    surfaces by id numbers. Detailed object information is emitted only as
    needed: on the first object occurrence, and afterwards only if
    weston_timeline_object::force_refresh asks for it.
    
    The detailed information for surfaces includes the string returned by
    weston_surface::get_label. Therefore it is important to set
    weston_timeline_object::force_refresh = 1 whenever the string would
    change, so that the new details get recorded.
    
    A rudimentary parser and SVG generator can be found at:
    https://github.com/ppaalanen/wesgr
    
    The timeline logs can answer questions including:
    - How does the compositor repaint cycle work timing-wise?
    - When was the vblank deadline missed?
    - What is the latency from surface commit to showing the new content on
      screen?
    - How long does it take to process the scenegraph?
    
    v2: weston_surface::get_description renamed to get_label.
    v3: reafctor a bit into fprint_quoted_string().
    Signed-off-by: Pekka Paalanen's avatarPekka Paalanen <pekka.paalanen@collabora.co.uk>
    b502654b
shell.c 176 KB