From 11c4c745c7ed5477c74abe7de3458924a0567a3a Mon Sep 17 00:00:00 2001 From: "Danilo M." Date: Wed, 28 Oct 2026 09:18:17 +0100 Subject: 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 --- desktop/modules/perf/test_vram.sh | 40 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100755 desktop/modules/perf/test_vram.sh (limited to 'desktop/modules/perf/test_vram.sh') diff --git a/desktop/modules/perf/test_vram.sh b/desktop/modules/perf/test_vram.sh new file mode 100755 index 0000000..7ef4ade --- /dev/null +++ b/desktop/modules/perf/test_vram.sh @@ -0,0 +1,40 @@ +#!/bin/sh +# +# Copyright (C) 2026 Danilo M. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License version 2 as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + +# vram.sh: summed once per xe client id, units honoured, other drivers +# ignored; nothing at all when no xe client is found. +set -e +dir=$(dirname "$0") +tmp=$(mktemp) +trap 'rm -f "$tmp"' EXIT + +printf '%s\n' \ + "/proc/1/fdinfo/7:drm-driver: xe" \ + "/proc/1/fdinfo/7:drm-client-id: 38" \ + "/proc/1/fdinfo/7:drm-resident-vram0: 1024 KiB" \ + "/proc/1/fdinfo/10:drm-driver: xe" \ + "/proc/1/fdinfo/10:drm-client-id: 38" \ + "/proc/1/fdinfo/10:drm-resident-vram0: 1024 KiB" \ + "/proc/2/fdinfo/5:drm-driver: xe" \ + "/proc/2/fdinfo/5:drm-client-id: 40" \ + "/proc/2/fdinfo/5:drm-resident-vram0: 2 MiB" \ + "/proc/3/fdinfo/4:drm-driver: amdgpu" \ + "/proc/3/fdinfo/4:drm-client-id: 1" \ + "/proc/3/fdinfo/4:drm-resident-vram0: 9 GiB" > "$tmp" +got=$(sh "$dir/vram.sh" "$tmp") +[ "$got" = $((1024 * 1024 + 2 * 1024 * 1024)) ] || { echo "vram: got '$got'"; exit 1; } + +: > "$tmp" +got=$(sh "$dir/vram.sh" "$tmp") +[ -z "$got" ] || { echo "empty: got '$got'"; exit 1; } +echo ok -- cgit v1.2.3