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9c7d64eb2a
qht_lookup is meant to be called from an RCU read-critical section. Make sure we're in such a section in test-qht when performing lookups, despite the fact that no races in qht can be triggered by test-qht since it is single-threaded. Note that rcu_register_thread is already called by the rcu_after_fork hook, and therefore duplicating it here would be a bug. Signed-off-by: Emilio G. Cota <cota@braap.org> Message-Id: <1475706880-10667-4-git-send-email-cota@braap.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
167 lines
3.1 KiB
C
167 lines
3.1 KiB
C
/*
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* Copyright (C) 2016, Emilio G. Cota <cota@braap.org>
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*
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* License: GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/qht.h"
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#include "qemu/rcu.h"
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#define N 5000
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static struct qht ht;
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static int32_t arr[N * 2];
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static bool is_equal(const void *obj, const void *userp)
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{
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const int32_t *a = obj;
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const int32_t *b = userp;
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return *a == *b;
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}
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static void insert(int a, int b)
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{
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int i;
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for (i = a; i < b; i++) {
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uint32_t hash;
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arr[i] = i;
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hash = i;
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qht_insert(&ht, &arr[i], hash);
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}
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}
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static void rm(int init, int end)
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{
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int i;
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for (i = init; i < end; i++) {
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uint32_t hash;
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hash = arr[i];
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g_assert_true(qht_remove(&ht, &arr[i], hash));
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}
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}
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static void check(int a, int b, bool expected)
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{
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struct qht_stats stats;
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int i;
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rcu_read_lock();
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for (i = a; i < b; i++) {
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void *p;
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uint32_t hash;
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int32_t val;
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val = i;
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hash = i;
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p = qht_lookup(&ht, is_equal, &val, hash);
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g_assert_true(!!p == expected);
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}
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rcu_read_unlock();
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qht_statistics_init(&ht, &stats);
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if (stats.used_head_buckets) {
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g_assert_cmpfloat(qdist_avg(&stats.chain), >=, 1.0);
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}
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g_assert_cmpuint(stats.head_buckets, >, 0);
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qht_statistics_destroy(&stats);
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}
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static void count_func(struct qht *ht, void *p, uint32_t hash, void *userp)
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{
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unsigned int *curr = userp;
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(*curr)++;
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}
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static void check_n(size_t expected)
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{
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struct qht_stats stats;
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qht_statistics_init(&ht, &stats);
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g_assert_cmpuint(stats.entries, ==, expected);
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qht_statistics_destroy(&stats);
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}
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static void iter_check(unsigned int count)
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{
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unsigned int curr = 0;
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qht_iter(&ht, count_func, &curr);
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g_assert_cmpuint(curr, ==, count);
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}
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static void qht_do_test(unsigned int mode, size_t init_entries)
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{
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/* under KVM we might fetch stats from an uninitialized qht */
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check_n(0);
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qht_init(&ht, 0, mode);
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check_n(0);
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insert(0, N);
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check(0, N, true);
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check_n(N);
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check(-N, -1, false);
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iter_check(N);
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rm(101, 102);
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check_n(N - 1);
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insert(N, N * 2);
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check_n(N + N - 1);
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rm(N, N * 2);
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check_n(N - 1);
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insert(101, 102);
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check_n(N);
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rm(10, 200);
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check_n(N - 190);
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insert(150, 200);
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check_n(N - 190 + 50);
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insert(10, 150);
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check_n(N);
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rm(1, 2);
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check_n(N - 1);
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qht_reset_size(&ht, 0);
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check_n(0);
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check(0, N, false);
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qht_destroy(&ht);
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}
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static void qht_test(unsigned int mode)
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{
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qht_do_test(mode, 0);
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qht_do_test(mode, 1);
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qht_do_test(mode, 2);
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qht_do_test(mode, 8);
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qht_do_test(mode, 16);
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qht_do_test(mode, 8192);
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qht_do_test(mode, 16384);
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}
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static void test_default(void)
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{
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qht_test(0);
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}
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static void test_resize(void)
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{
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qht_test(QHT_MODE_AUTO_RESIZE);
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}
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int main(int argc, char *argv[])
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{
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g_test_init(&argc, &argv, NULL);
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g_test_add_func("/qht/mode/default", test_default);
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g_test_add_func("/qht/mode/resize", test_resize);
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return g_test_run();
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}
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