[Bug 110320] Improve igt_assert for timing checks

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110320

            Bug ID: 110320
           Summary: Improve igt_assert for timing checks
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: IGT
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: daniel at ffwll.ch

We have a lot of timing checks to make sure something happened in a desired
intervall, especially around vblank/flip timestamps. Debugging those is really
hard, best option to get started is to dump the ftrace flight recorder of what
happened (likely shedding some lights on where we stalled).

Could be useful to roll that into an igt_assert_timing macro to do
automatically on assert failures.

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