feat(perf): show GPU render and compute loadHEADmaster

xe exposes no busy percentage, but its DRM fdinfo carries per-engine
cycle counters. vram.sh becomes gpu.sh: the same scan also sums
drm-cycles-rcs/ccs per client and prints them with the GPU's cycle
counter, and Perf.js turns two scans into a percentage per engine.

The GPU card's headline is now the busier engine, with render (games)
and compute (local LLMs) as bars, then VRAM, temperature and fan.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 17 insertions, 5 deletions

diff --git a/desktop/modules/perf/Perf.qml b/desktop/modules/perf/Perf.qml
index 5fcf0ab..33b5cbc 100644
--- a/desktop/modules/perf/Perf.qml
+++ b/desktop/modules/perf/Perf.qml
@@ -56,6 +56,9 @@ Singleton {
     property var temps: []          // [{label, value, warn, crit}], value null if unread
     property var disks: []          // Perf.js df rows
     property var vram: null         // bytes
+    property var gpu: null          // gpuSample, the last scan
+    property var gpuRender: null    // percent, rcs
+    property var gpuCompute: null   // percent, ccs
     property var fan: null          // rpm
     property var rx: []             // bytes/s, newest last
     property var tx: []
@@ -181,18 +184,27 @@ Singleton {
             root.temps = t;
 
             if (fanView.path) { fanView.reload(); root.fan = root.num(fanView); }
-            if (!vramProc.running) vramProc.running = true;
+            if (!gpuProc.running) gpuProc.running = true;
         }
     }
 
     // ponytail: a shell glob over every fd on the system, ~14ms every 2s,
     // always; gate it on the panel again if that shows up. Only the user's own processes are readable, so a
     // system service's GPU use is not counted, as in conky.
-    // Summed in vram.sh, so JS gets one number, never the scan itself.
+    // Summed in gpu.sh, so JS gets five numbers, never the scan itself.
     Process {
-        id: vramProc
-        command: ["sh", `${Quickshell.shellDir}/modules/perf/vram.sh`]
-        stdout: StdioCollector { onStreamFinished: root.vram = text.trim() === "" ? null : Number(text) }
+        id: gpuProc
+        command: ["sh", `${Quickshell.shellDir}/modules/perf/gpu.sh`]
+        stdout: StdioCollector {
+            onStreamFinished: {
+                const cur = P.gpuSample(text);
+                const l = P.gpuLoad(root.gpu, cur);
+                root.vram = cur ? cur[0] : null;
+                root.gpuRender = l.render;
+                root.gpuCompute = l.compute;
+                root.gpu = cur;
+            }
+        }
     }
 
     // --- network ------------------------------------------------------------