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Store the timestamp of the current vblank in the new field 'time' of the vblank trace event. If the timestamp is calculated by a driver that supports high-precision vblank timing, set the field 'high-prec' to 'true'. User space can now access actual hardware vblank times via the tracing infrastructure. Tracing applications (such as GPUVis, see [0] for related discussion), can use the newly added information to conduct a more accurate analysis of display timing. v2 Fix author name (missing last name) [0] https://github.com/mikesart/gpuvis/issues/30 Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Heinrich Fink <heinrich.fink@daqri.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20190902142412.27846-2-heinrich.fink@daqri.com