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, 8 insertions, 1 deletions

diff --git a/desktop/modules/perf/test_perf.js b/desktop/modules/perf/test_perf.js
index d5856e8..a1a068d 100644
--- a/desktop/modules/perf/test_perf.js
+++ b/desktop/modules/perf/test_perf.js
@@ -20,7 +20,7 @@ const src = fs.readFileSync(__dirname + "/Perf.js", "utf8")
     .replace(/^\.pragma library$/m, "");
 const P = new Function(src + "\nreturn { cpuTimes, load, meminfo, df, rate, " +
     "hwmonMap, lanAddr, cpuModel, du, band, worst, isIPv4, parsePubip, formatPubip, " +
-    "ipCheck, due, push, bytes, speed, procs, sockets, netProcs };")();
+    "ipCheck, due, push, bytes, speed, procs, sockets, netProcs, gpuSample, gpuLoad };")();
 
 // cpuTimes: aggregate first, then cores; idle is idle + iowait.
 const stat = [
@@ -183,4 +183,11 @@ assert.deepStrictEqual(P.netProcs([{ key: "a", name: "firefox", rx: 5000, tx: 10
     [{ name: "firefox", rx: 3000, tx: 0 }]);
 assert.deepStrictEqual(P.netProcs([], later, 0), []);
 
+
+// gpu.sh: five numbers or nothing; load per engine between two scans.
+assert.strictEqual(P.gpuSample(""), null);
+const g1 = P.gpuSample("100 0 1000 0 1000\n"), g2 = P.gpuSample("100 200 2000 900 2000");
+assert.deepStrictEqual(P.gpuLoad(g1, g2), { render: 20, compute: 90 });
+assert.deepStrictEqual(P.gpuLoad(null, g2), { render: null, compute: null });
+assert.deepStrictEqual(P.gpuLoad(g2, [100, 0, 3000, 0, 2000]), { render: 0, compute: null });
 console.log("test_perf: ok");