gistfile1.txt

perf record -e sched:sched_stat_sleep -e sched:sched_switch -e sched:sched_process_exit -a -g --call-graph=dwarf -o perf.data.raw --pid $(pgrep named | head -n 1) -- sleep 10
perf inject -v -s -i perf.data.raw -o perf.data
perf script -F comm,pid,tid,cpu,time,period,event,ip,sym,dso,trace | awk '
    NF > 4 { exec = $1; period_ms = int($5 / 1000000) }
    NF > 1 && NF <= 4 && period_ms > 0 { print $2 }
    NF < 2 && period_ms > 0 { printf "%s\n%d\n\n", exec, period_ms }' | \
    ./stackcollapse.pl | \
    ./flamegraph.pl --countname=ms --title="Off-CPU Time Flame Graph" --colors=io > offcpu.svg