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#!/usr/bin/env bpftrace
/*
* runqlat.bt CPU scheduler run queue latency as a histogram.
* For Linux, uses bpftrace, eBPF.
*
* This is a bpftrace version of the bcc tool of the same name.
*
* Copyright 2018 Netflix, Inc.
* Licensed under the Apache License, Version 2.0 (the "License")
*
* 17-Sep-2018 Brendan Gregg Created this.
*/
#include <linux/sched.h>
BEGIN
{
printf("Tracing CPU scheduler... Hit Ctrl-C to end.\n");
}
tracepoint:sched:sched_wakeup,
tracepoint:sched:sched_wakeup_new
{
@qtime[args.pid] = nsecs;
}
tracepoint:sched:sched_switch
{
if (args.prev_state == TASK_RUNNING) {
@qtime[args.prev_pid] = nsecs;
}
$ns = @qtime[args.next_pid];
if ($ns) {
@usecs = hist((nsecs - $ns) / 1000);
}
delete(@qtime[args.next_pid]);
}
END
{
clear(@qtime);
}