tests/test-qht.c

   1 /*
   2  * Copyright (C) 2016, Emilio G. Cota <cota@braap.org>
   3  *
   4  * License: GNU GPL, version 2 or later.
   5  *   See the COPYING file in the top-level directory.
   6  */
   7 #include "qemu/osdep.h"
   8 #include "qemu/qht.h"
   9 #include "qemu/rcu.h"
  10
  11 #define N 5000
  12
  13 static struct qht ht;
  14 static int32_t arr[N * 2];
  15
  16 static bool is_equal(const void *ap, const void *bp)
  17 {
  18     const int32_t *a = ap;
  19     const int32_t *b = bp;
  20
  21     return *a == *b;
  22 }
  23
  24 static void insert(int a, int b)
  25 {
  26     int i;
  27
  28     for (i = a; i < b; i++) {
  29         uint32_t hash;
  30
  31         arr[i] = i;
  32         hash = i;
  33
  34         qht_insert(&ht, &arr[i], hash);
  35     }
  36 }
  37
  38 static void rm(int init, int end)
  39 {
  40     int i;
  41
  42     for (i = init; i < end; i++) {
  43         uint32_t hash;
  44
  45         hash = arr[i];
  46         g_assert_true(qht_remove(&ht, &arr[i], hash));
  47     }
  48 }
  49
  50 static void check(int a, int b, bool expected)
  51 {
  52     struct qht_stats stats;
  53     int i;
  54
  55     rcu_read_lock();
  56     for (i = a; i < b; i++) {
  57         void *p;
  58         uint32_t hash;
  59         int32_t val;
  60
  61         val = i;
  62         hash = i;
  63         /* test both lookup variants; results should be the same */
  64         if (i % 2) {
  65             p = qht_lookup(&ht, &val, hash);
  66         } else {
  67             p = qht_lookup_custom(&ht, &val, hash, is_equal);
  68         }
  69         g_assert_true(!!p == expected);
  70     }
  71     rcu_read_unlock();
  72
  73     qht_statistics_init(&ht, &stats);
  74     if (stats.used_head_buckets) {
  75         g_assert_cmpfloat(qdist_avg(&stats.chain), >=, 1.0);
  76     }
  77     g_assert_cmpuint(stats.head_buckets, >, 0);
  78     qht_statistics_destroy(&stats);
  79 }
  80
  81 static void count_func(struct qht *ht, void *p, uint32_t hash, void *userp)
  82 {
  83     unsigned int *curr = userp;
  84
  85     (*curr)++;
  86 }
  87
  88 static void check_n(size_t expected)
  89 {
  90     struct qht_stats stats;
  91
  92     qht_statistics_init(&ht, &stats);
  93     g_assert_cmpuint(stats.entries, ==, expected);
  94     qht_statistics_destroy(&stats);
  95 }
  96
  97 static void iter_check(unsigned int count)
  98 {
  99     unsigned int curr = 0;
 100
 101     qht_iter(&ht, count_func, &curr);
 102     g_assert_cmpuint(curr, ==, count);
 103 }
 104
 105 static void qht_do_test(unsigned int mode, size_t init_entries)
 106 {
 107     /* under KVM we might fetch stats from an uninitialized qht */
 108     check_n(0);
 109
 110     qht_init(&ht, is_equal, 0, mode);
 111
 112     check_n(0);
 113     insert(0, N);
 114     check(0, N, true);
 115     check_n(N);
 116     check(-N, -1, false);
 117     iter_check(N);
 118
 119     rm(101, 102);
 120     check_n(N - 1);
 121     insert(N, N * 2);
 122     check_n(N + N - 1);
 123     rm(N, N * 2);
 124     check_n(N - 1);
 125     insert(101, 102);
 126     check_n(N);
 127
 128     rm(10, 200);
 129     check_n(N - 190);
 130     insert(150, 200);
 131     check_n(N - 190 + 50);
 132     insert(10, 150);
 133     check_n(N);
 134
 135     rm(1, 2);
 136     check_n(N - 1);
 137     qht_reset_size(&ht, 0);
 138     check_n(0);
 139     check(0, N, false);
 140
 141     qht_destroy(&ht);
 142 }
 143
 144 static void qht_test(unsigned int mode)
 145 {
 146     qht_do_test(mode, 0);
 147     qht_do_test(mode, 1);
 148     qht_do_test(mode, 2);
 149     qht_do_test(mode, 8);
 150     qht_do_test(mode, 16);
 151     qht_do_test(mode, 8192);
 152     qht_do_test(mode, 16384);
 153 }
 154
 155 static void test_default(void)
 156 {
 157     qht_test(0);
 158 }
 159
 160 static void test_resize(void)
 161 {
 162     qht_test(QHT_MODE_AUTO_RESIZE);
 163 }
 164
 165 int main(int argc, char *argv[])
 166 {
 167     g_test_init(&argc, &argv, NULL);
 168     g_test_add_func("/qht/mode/default", test_default);
 169     g_test_add_func("/qht/mode/resize", test_resize);
 170     return g_test_run();
 171 }