bpftrace issue 817

script.sh

#!/bin/bash

# Let bpftrace count kills
# do a lot of kills for x seconds
# Setup extra kill tracer
# Setup bpftrace map clear tracer
# Loop:
#   Send single kill
#   dump map content


tmpdir=$(mktemp -d)
logfile="${tmpdir}/log"
mkfifo $logfile

echo "tempdir: ${tmpdir}"

sudo bpftrace -o "$logfile" -e "
t:syscalls:sys_enter_kill {
  @kills[probe] = count();
}
interval:s:1 {
  time(); print(@kills); clear(@kills);
}" & TRACE_PID=$!

cat $logfile > /dev/null & CAT_PID=$!
# give bpftrace time to setup maps
sleep 3
MAPS=$(sudo bpftool  map | awk '$2 ~ /percpu_hash/ { print $1 }' | tr -d ':')

starttime=$(date +%s)

echo "Killing for a while"
while [ $(date +%s) -le $((starttime + 20)) ]; do
	kill 3 &>/dev/null &
done

kill $CAT_PID
cat $logfile & CAT_PID=$!
sudo bpftrace -e 'uretprobe:./bpftrace/src/bpftrace:*clear_mapE* { printf("Clear returned at: "); time(); }' & CLEAR_PID=$!
sudo bpftrace -e 'tracepoint:syscalls:sys_enter_kill { @ = count(); } i:s:10 { printf("Kill count: "); print(@) }' & KILL_PID=$!

for i in {1..60}; do
	date
	if [[ -n $1 && $1 == "kill" ]]; then
		echo "Sending kill"
		kill 3 &>/dev/null #; kill 3 &>/dev/null; kill 3 &>/dev/null; kill 3 &>/dev/null
	fi
	echo "Map contents"
	echo $MAPS | xargs -n 1 sudo bpftool map dump id
	sleep 1;
done

kill $CAT_PID
sudo pkill -P $$
sudo pkill bpftrace