kms/impl-device: Add debug logging for deadline dispatch lateness
And also "completion" time to measure when the commit returned. This is structured so as to measure all timestamps first before logging anything. That way our results shouldn't be (don't seem to be) affected by the logging itself. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3265> Signed-off-by: Mingi Sung <sungmg@saltyming.net>
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@ -1397,6 +1397,10 @@ crtc_frame_deadline_dispatch (MetaThreadImpl *thread_impl,
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g_autoptr (MetaKmsFeedback) feedback = NULL;
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uint64_t timer_value;
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ssize_t ret;
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int64_t dispatch_time_us = 0;
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if (meta_is_topic_enabled (META_DEBUG_KMS_DEADLINE))
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dispatch_time_us = g_get_monotonic_time ();
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ret = read (crtc_frame->deadline.timer_fd,
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&timer_value,
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@ -1418,6 +1422,23 @@ crtc_frame_deadline_dispatch (MetaThreadImpl *thread_impl,
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crtc_frame->crtc,
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g_steal_pointer (&crtc_frame->pending_update),
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META_KMS_UPDATE_FLAG_NONE);
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if (meta_is_topic_enabled (META_DEBUG_KMS_DEADLINE))
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{
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int64_t lateness_us, duration_us;
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lateness_us = dispatch_time_us -
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crtc_frame->deadline.expected_deadline_time_us;
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duration_us = g_get_monotonic_time () - dispatch_time_us;
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meta_topic (META_DEBUG_KMS_DEADLINE,
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"Deadline dispatch started %3"G_GINT64_FORMAT "µs %s and "
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"completed %3"G_GINT64_FORMAT "µs after that.",
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ABS (lateness_us),
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lateness_us >= 0 ? "late" : "early",
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duration_us);
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}
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if (meta_kms_feedback_did_pass (feedback))
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crtc_frame->deadline.is_deadline_page_flip = TRUE;
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disarm_crtc_frame_deadline_timer (crtc_frame);
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