syslatl.kp

#!/usr/bin/env ktap
#
# syslatl.kp	syscall latency linear aggregation
#
# 10-Nov-2013	Brendan Gregg	Created this

var step = 10	# number of ms per step

var self = {}
var lats = {}
var max = 0

trace syscalls:sys_enter_* {
	self[tid] = gettimeofday_us()
}

trace syscalls:sys_exit_* {
	if (self[tid] == nil) { return }
	var delta = (gettimeofday_us() - self[tid]) / (step * 1000)
	if (delta > max) { max = delta }
	lats[delta] += 1
	self[tid] = nil
}

trace_end {
	printf("   %8s %8s\n", "LAT(ms)+", "COUNT");
	for (i = 0, max, 1) {
		if (lats[i] == nil) {
			lats[i] = 0
		}
		printf("   %8d %8d\n", i * step, lats[i]);
	}
}