#!/usr/bin/env bash

set -euo pipefail

OUT_DIR="${HOME}/workspace/debug/flamegraph"
OUT_DATA="${OUT_DIR}/$(date +%y%m%d-%H%M%S).data"
OUT_SVG="${OUT_DIR}/$(date +%y%m%d-%H%M%S).svg"

mkdir -p "${OUT_DIR}"

# record the data with perf. We need to run this with sudo to get all
# the privileges we need.
sudo perf record -g --call-graph dwarf --freq max --output "${OUT_DATA}" "$@"

# give me ownership of the file
sudo chown "${USER}" "${OUT_DATA}"

perf script --input "${OUT_DATA}" |
  stackcollapse-perf.pl |
  flamegraph.pl >"${OUT_SVG}"