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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>
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