perf: sum VRAM in a shell script instead of in QML

A process holding thousands of DRM fds makes the fdinfo scan a few
hundred KB. Parsing that in QML every 2s drove Qt's unmanaged-heap
counter to underflow, after which the V4 engine ran a GC on every
allocation and the shell sat at 100% CPU.

vram.sh does the scan and the per-client-id sum in awk and prints one
number, or nothing when no xe client is found, which the panel draws as
a dash. Perf.js loses vram() and its test; test_vram.sh carries the same
cases against the script, which takes a file argument instead of
scanning so the test can feed it.

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

1 files changed, 0 insertions, 24 deletions

diff --git a/desktop/modules/perf/Perf.js b/desktop/modules/perf/Perf.js
index 03fd484..d067d3b 100644
--- a/desktop/modules/perf/Perf.js
+++ b/desktop/modules/perf/Perf.js
@@ -16,8 +16,6 @@
 // or numbers and returns values. A reading that cannot be made is null, and
 // the panel draws null as a dash.
 
-const UNITS = { "": 1, B: 1, KiB: 1024, MiB: 1024 ** 2, GiB: 1024 ** 3 };
-
 // A public IP older than this is not shown: by then the fetch has failed
 // for hours, and an address that may no longer be ours is worse than a dash.
 const STALE = 4 * 3600;
@@ -86,28 +84,6 @@ function du(text) {
     return { total: rows[0].bytes, items: rows.slice(1) };
 }
 
-// VRAM in bytes from the fdinfo scan: drm-resident-vram0 of every xe fd,
-// counted once per drm-client-id because a client holds several fds.
-function vram(text) {
-    const fds = {};
-    for (const line of text.split("\n")) {
-        const m = /^([^:]*):(drm-[\w-]+):\s*(.*)$/.exec(line);
-        if (!m) continue;
-        (fds[m[1]] = fds[m[1]] || {})[m[2]] = m[3];
-    }
-    const seen = {};
-    let total = null;
-    for (const path in fds) {
-        const fd = fds[path];
-        const id = fd["drm-client-id"];
-        const n = /^(\d+)\s*(\w*)/.exec(fd["drm-resident-vram0"] || "");
-        if (fd["drm-driver"] !== "xe" || !id || !n || seen[id]) continue;
-        seen[id] = true;
-        total = (total || 0) + Number(n[1]) * (UNITS[n[2]] || 1);
-    }
-    return total;
-}
-
 // Bytes per second between two counter readings. A counter that went
 // backwards (interface reset) gives null rather than a negative spike.
 function rate(prev, cur, secs) {