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Perf Flame Graph

sudo perf record -F 99 -g -- sleep 30 $(pidof qemu-system-x86_64)
sudo perf report -n --stdio
sudo perf script | gzip > out.perf01.gz
git clone https://github.com/cobblau/FlameGraph && cd FlameGraph
; http://svgshare.com can be used to share svg
sudo perf script | ./stackcollapse-perf.pl | sed '/cpu_idle/d;s/\[unknown\];//g' | ./flamegraph.pl --width 1000 > perf.svg

Reference

[1] http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html