#!/bin/sh

ftrace {
	options = "sym-addr", "context-info"
	buffer_size = 1MB
}

ftrace.event {
	# Sample1: Make a histogram for initcall functions
	synthetic.initcall_latency {
                fields = "unsigned long func", "u64 lat"
		hist {
			keys = func.sym, lat
			vals = lat
			sort = lat
		}
	}
	initcall.initcall_start.hist {
		keys = func
		var.ts0 = common_timestamp.usecs
	}
	initcall.initcall_finish.hist {
		keys = func
		var.lat = common_timestamp.usecs - $ts0
		onmatch {
			event = initcall.initcall_start
			action = "initcall_latency(func, $lat)"
		}
	}

	# Sample2: kmalloc() tracing in read(2) syscall
	syscalls.sys_enter_read.enable_event {
		event = kmem.kmalloc
		count = 1
	}
	syscalls.sys_exit_read.disable_event {
		event = kmem.kmalloc
	}

	# Sample3: Stacktrace at the event
	kmem.kmalloc.stacktrace {
		count = 5
		filter = 'bytes_req >= 65536'
	}

	# Sample4: Take a snapshot
	block.block_unplug.snapshot {
		count = 1
		filter = nr_rq > 1
	}

	# Sample5: Trace-on/off
	block.block_plug.traceon {
		filter = nr_rq > 1
	}
	block.block_unplug.traceoff {
		filter = nr_rq > 1
	}

        # Sample6: onmax
	sched.sched_waking {
		enable
		hist {
			keys = pid
			ts1 = common_timestamp.usecs
			filter = 'comm == "cyclictest"'
		}
	}
	sched.sched_switch {
		enable
		hist {
			keys = next_pid
			var.wakeup_lat = common_timestamp.usecs - $ts1
			onmax {
				var = wakeup_lat
				action = "save(next_prio,next_comm,prev_pid,prev_prio,prev_comm)"
			}
			filter = 'next_comm == "cyclictest"'
		}
	}
}