#!/usr/bin/env ktap

var self = {}
var count_max = 0
var count_min = 0
var count_num = 0
var total_time = 0

printf("measure time(us) of function vfs_read\n");

trace probe:vfs_read {
    if (execname == "ktap") {
        return
    }

    self[tid] = gettimeofday_us()
}

trace probe:vfs_read%return {
    if (execname == "ktap") {
        return
    }

    if (self[tid] == nil) {
        return
    }

    var durtion = gettimeofday_us() - self[tid]
    if (durtion > count_max) {
        count_max = durtion
    }
    var min = count_min
    if (min == 0 || durtion < min) {
        count_min = durtion
    }

    count_num = count_num + 1
    total_time = total_time + durtion

    self[tid] = nil
}

trace_end {
    var avg
    if (count_num == 0) {
        avg = 0
    } else {
        avg = total_time/count_num
    }

    printf("avg\tmax\tmin\n");
    printf("-------------------\n")
    printf("%d\t%d\t%d\n", avg, count_max, count_min)
}