LXR qemu/tests/unit/test-timed-average.c

   1/*
   2 * Timed average computation tests
   3 *
   4 * Copyright Nodalink, EURL. 2014
   5 *
   6 * Authors:
   7 *  Benoît Canet     <benoit.canet@nodalink.com>
   8 *
   9 * This work is licensed under the terms of the GNU LGPL, version 2 or later.
  10 * See the COPYING.LIB file in the top-level directory.
  11 */
  12
  13#include "qemu/osdep.h"
  14#include "sysemu/cpu-timers.h"
  15#include "qemu/timed-average.h"
  16
  17/* This is the clock for QEMU_CLOCK_VIRTUAL */
  18static int64_t my_clock_value;
  19
  20int64_t cpu_get_clock(void)
  21{
  22    return my_clock_value;
  23}
  24
  25static void account(TimedAverage *ta)
  26{
  27    timed_average_account(ta, 1);
  28    timed_average_account(ta, 5);
  29    timed_average_account(ta, 2);
  30    timed_average_account(ta, 4);
  31    timed_average_account(ta, 3);
  32}
  33
  34static void test_average(void)
  35{
  36    TimedAverage ta;
  37    uint64_t result;
  38    int i;
  39
  40    /* we will compute some average on a period of 1 second */
  41    timed_average_init(&ta, QEMU_CLOCK_VIRTUAL, NANOSECONDS_PER_SECOND);
  42
  43    result = timed_average_min(&ta);
  44    g_assert(result == 0);
  45    result = timed_average_avg(&ta);
  46    g_assert(result == 0);
  47    result = timed_average_max(&ta);
  48    g_assert(result == 0);
  49
  50    for (i = 0; i < 100; i++) {
  51        account(&ta);
  52        result = timed_average_min(&ta);
  53        g_assert(result == 1);
  54        result = timed_average_avg(&ta);
  55        g_assert(result == 3);
  56        result = timed_average_max(&ta);
  57        g_assert(result == 5);
  58        my_clock_value += NANOSECONDS_PER_SECOND / 10;
  59    }
  60
  61    my_clock_value += NANOSECONDS_PER_SECOND * 100;
  62
  63    result = timed_average_min(&ta);
  64    g_assert(result == 0);
  65    result = timed_average_avg(&ta);
  66    g_assert(result == 0);
  67    result = timed_average_max(&ta);
  68    g_assert(result == 0);
  69
  70    for (i = 0; i < 100; i++) {
  71        account(&ta);
  72        result = timed_average_min(&ta);
  73        g_assert(result == 1);
  74        result = timed_average_avg(&ta);
  75        g_assert(result == 3);
  76        result = timed_average_max(&ta);
  77        g_assert(result == 5);
  78        my_clock_value += NANOSECONDS_PER_SECOND / 10;
  79    }
  80}
  81
  82int main(int argc, char **argv)
  83{
  84    /* tests in the same order as the header function declarations */
  85    g_test_init(&argc, &argv, NULL);
  86    g_test_add_func("/timed-average/average", test_average);
  87    return g_test_run();
  88}
  89
  90