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profiling requires patching systemd during initramfs build; remove runtime profiling option

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Anderson Rosenberg 2025-10-22 19:01:39 -04:00
parent 501d68bf7e
commit 4ac936df5b
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GPG key ID: 7ACF448C0590AB9C
6 changed files with 65 additions and 24 deletions
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tools/reliant-profiling-patch-systemd Normal file
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#!/usr/bin/sh
# Create a new file to be patched
binary=/usr/lib/systemd/systemd-volatile-root
target=/usr/lib/systemd/systemd-volatile-root.reliant-profiling
cp $binary $target
# We must NOP calls to umount and rmdir
hex_offsets=$(objdump -d "$binary" | grep -E 'call.*(umount|rmdir)' | awk '{ print $1 }' | tr -d ':')
for hex_offset in $hex_offsets; do
dec_offset=$(perl -le "print hex(\"$hex_offset\")")
printf '\x90\x90\x90\x90\x90' | dd of="$target" bs=1 seek=$dec_offset conv=notrunc
done
# Verify the patch has succeeded
for hex_offset in $hex_offsets; do
echo -n "$hex_offset: "
opcode=$(objdump -d "$target" | grep $hex_offset | awk '{ print $3 }')
if [ $opcode -eq 90 ]; then
echo "OK"
else
echo "FAIL"
fi
done