diff --git a/src/config.c b/src/config.c index efbf279..8c1ca91 100644 --- a/src/config.c +++ b/src/config.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -623,7 +624,9 @@ struct debug_options_entry { }; static const struct debug_options_entry debug_options_entries[] = { - + "smart_frame_pacing", + NULL, + offsetof(struct debug_options, smart_frame_pacing), }; void parse_debug_option_single(char *setting, struct debug_options *debug_options) { diff --git a/src/config.h b/src/config.h index bdf384a..ac3b6ad 100644 --- a/src/config.h +++ b/src/config.h @@ -85,7 +85,9 @@ enum vblank_scheduler_type { /// Internal, private options for debugging and development use. struct debug_options { - + /// Try to reduce frame latency by using vblank interval and render time + /// estimates. Right now it's not working well across drivers. + int smart_frame_pacing; }; /// Structure representing all options. diff --git a/src/picom.c b/src/picom.c index 4c75329..b7bb14c 100644 --- a/src/picom.c +++ b/src/picom.c @@ -152,6 +152,12 @@ collect_vblank_interval_statistics(struct vblank_event *e, void *ud) { assert(ps->frame_pacing); assert(ps->vblank_scheduler); + if (!ps->o.debug_options.smart_frame_pacing) { + // We don't need to collect statistics if we are not doing smart frame + // pacing. + return VBLANK_CALLBACK_DONE; + } + // TODO(yshui): this naive method of estimating vblank interval does not handle // the variable refresh rate case very well. This includes the case // of a VRR enabled monitor; or a monitor that's turned off, in which @@ -220,13 +226,15 @@ enum vblank_callback_action schedule_render_at_vblank(struct vblank_event *e, vo } // The frame has been finished and presented, record its render time. - int render_time_us = - (int)(render_time.tv_sec * 1000000L + render_time.tv_nsec / 1000L); - render_statistics_add_render_time_sample( - &ps->render_stats, render_time_us + (int)ps->last_schedule_delay); - log_verbose("Last render call took: %d (gpu) + %d (cpu) us, " - "last_msc: %" PRIu64, - render_time_us, (int)ps->last_schedule_delay, ps->last_msc); + if (ps->o.debug_options.smart_frame_pacing) { + int render_time_us = + (int)(render_time.tv_sec * 1000000L + render_time.tv_nsec / 1000L); + render_statistics_add_render_time_sample( + &ps->render_stats, render_time_us + (int)ps->last_schedule_delay); + log_verbose("Last render call took: %d (gpu) + %d (cpu) us, " + "last_msc: %" PRIu64, + render_time_us, (int)ps->last_schedule_delay, ps->last_msc); + } ps->last_schedule_delay = 0; ps->backend_busy = false; @@ -319,6 +327,9 @@ void schedule_render(session_t *ps, bool triggered_by_vblank attr_unused) { return; } + // if ps->o.debug_options.smart_frame_pacing is false, we won't have any render + // time or vblank interval estimates, so we would naturally fallback to schedule + // render immediately. auto render_budget = render_statistics_get_budget(&ps->render_stats, &divisor); auto frame_time = render_statistics_get_vblank_time(&ps->render_stats); if (frame_time == 0) {