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#!/bin/sh
#
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# 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.
# GPU from the fdinfo scan, every xe fd counted once per drm-client-id
# because a client holds several fds. Prints one line, "vram rcs_busy
# rcs_clock ccs_busy ccs_clock": VRAM in bytes (drm-resident-vram0), then
# per engine the busy cycles summed over clients and the GPU's cycle
# counter, which Perf.js turns into a percentage between two scans. rcs is
# render (games), ccs compute (local LLMs). Prints nothing when no xe
# client is found. With a file argument it reads that instead of scanning,
# for test_gpu.sh.
#
# Summed here rather than in JS: a process holding thousands of DRM fds
# makes the scan a few hundred KB, which is a lot of string churn to parse
# in QML every 2 s. It was moved here while chasing a GC underflow that
# turned out to be the sound OSD's createImageData (AGENTS.md), not this.
#
# Fds of a repeated client id with different values: the first one awk's
# for-in reaches counts, where Perf.js took the first in scan order. They
# share one client, so the values agree in practice.
scan() {
if [ -n "$1" ]; then cat "$1"
else grep -sH -e '^drm-driver' -e '^drm-client-id' -e '^drm-resident-vram0' \
-e '^drm-cycles-[rc]cs' -e '^drm-total-cycles-[rc]cs' \
/proc/[0-9]*/fdinfo/* 2>/dev/null
fi
}
scan "$1" | awk -F: '
NF >= 3 && $2 ~ /^drm-/ {
v = $3
for (i = 4; i <= NF; i++) v = v ":" $i
sub(/^[ \t]+/, "", v)
d[$1, $2] = v
fd[$1]
}
END {
for (p in fd) {
id = d[p, "drm-client-id"]
if (d[p, "drm-driver"] != "xe" || id == "" || (id in seen)) continue
if (split(d[p, "drm-resident-vram0"], n, " ") < 1 || n[1] !~ /^[0-9]+$/) continue
for (i = 1; i <= 2; i++) {
e = i == 1 ? "rcs" : "ccs"
busy[e] += d[p, "drm-cycles-" e]
c = d[p, "drm-total-cycles-" e] + 0
if (c > clock[e]) clock[e] = c
}
seen[id]
u = n[2] == "KiB" ? 1024 : n[2] == "MiB" ? 1048576 : n[2] == "GiB" ? 1073741824 : 1
total += n[1] * u
any = 1
}
if (any) printf "%.0f %.0f %.0f %.0f %.0f\n", total, busy["rcs"], clock["rcs"], busy["ccs"], clock["ccs"]
}'
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