Example bt file

cpu_walk.bt

#!/usr/bin/env bpftrace
/*
 * cpuwalk	Sample which CPUs are executing processes.
 *		For Linux, uses bpftrace and eBPF.
 *
 * USAGE: cpuwalk.bt
 *
 * This is a bpftrace version of the DTraceToolkit tool of the same name.
 *
 * Copyright 2018 Netflix, Inc.
 * Licensed under the Apache License, Version 2.0 (the "License")
 *
 * 08-Sep-2018	Brendan Gregg	Created this.
 */

BEGIN
{
	printf("Sampling CPU at 99hz... Hit Ctrl-C to end.\n");
}

profile:hz:99
/pid/
{
	@cpu = lhist(cpu, 0, 1000, 1);
}