monolith

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Commit `6c3361e382e4`

atagen <boss@atagen.co>2026-10-16 13:12 UTC

1 file changed+19-0

monolith: log presented frames per second per output at debug level

Modified file: crates/monolith/src/drm.rs+19 additions@@ -68,6 +68,9 @@ struct Surface {
     /// The vblank the frame being drawn or queued is meant for.
     target_ns: Option<u64>,
     budget: Budget,
+    /// Frames presented since `stats_since`, for the once-a-second debug line.
+    presented: u32,
+    stats_since: u64,
 }
 
 impl Surface {
@@ -366,6 +369,8 @@ fn connect(state: &mut State, connector: connector::Info, crtc: crtc::Handle) {
             scheduled: None,
             target_ns: None,
             budget: Budget::new(),
+            presented: 0,
+            stats_since: 0,
             refresh_ns: 1_000_000_000_000 / u64::from(wl_mode.refresh.max(1) as u32),
         },
     );
@@ -418,6 +423,20 @@ fn on_vblank(state: &mut State, crtc: crtc::Handle, meta: &mut Option<DrmEventMe
             }
         }
         surface.last_vblank_ns = Some(t);
+        surface.presented += 1;
+        let window = t.saturating_sub(surface.stats_since);
+        if window >= 1_000_000_000 {
+            let vblanks = window / surface.refresh_ns.max(1);
+            tracing::debug!(
+                output = surface.output.name(),
+                presented = surface.presented,
+                vblanks,
+                budget_us = surface.budget.ns() / 1000,
+                "frame rate"
+            );
+            surface.presented = 0;
+            surface.stats_since = t;
+        }
     }
     if surface.redraw {
         schedule(state, crtc);