A tool to collect relative changes in some registers of sysfs can be used in the Mesa jobs to record information while the tests are being executed. Signed-off-by: Sergi Blanch Torne <sergi.blanch.torne@collabora.com> Reviewed-by: Eric Engestrom <eric@engestrom.ch> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24177>