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Diffstat (limited to 'tests/unit/test-rcu-list.c')
| -rw-r--r-- | tests/unit/test-rcu-list.c | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/tests/unit/test-rcu-list.c b/tests/unit/test-rcu-list.c new file mode 100644 index 0000000000..49641e1936 --- /dev/null +++ b/tests/unit/test-rcu-list.c @@ -0,0 +1,381 @@ +/* + * rcuq_test.c + * + * usage: rcuq_test <readers> <duration> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright (c) 2013 Mike D. Day, IBM Corporation. + */ + +#include "qemu/osdep.h" +#include "qemu/atomic.h" +#include "qemu/rcu.h" +#include "qemu/thread.h" +#include "qemu/rcu_queue.h" + +/* + * Test variables. + */ + +static QemuMutex counts_mutex; +static long long n_reads = 0LL; +static long long n_updates = 0LL; +static int64_t n_reclaims; +static int64_t n_nodes_removed; +static long long n_nodes = 0LL; +static int g_test_in_charge = 0; + +static int nthreadsrunning; + +#define GOFLAG_INIT 0 +#define GOFLAG_RUN 1 +#define GOFLAG_STOP 2 + +static int goflag = GOFLAG_INIT; + +#define RCU_READ_RUN 1000 +#define RCU_UPDATE_RUN 10 +#define NR_THREADS 100 +#define RCU_Q_LEN 100 + +static QemuThread threads[NR_THREADS]; +static struct rcu_reader_data *data[NR_THREADS]; +static int n_threads; + +static int select_random_el(int max) +{ + return (rand() % max); +} + + +static void create_thread(void *(*func)(void *)) +{ + if (n_threads >= NR_THREADS) { + fprintf(stderr, "Thread limit of %d exceeded!\n", NR_THREADS); + exit(-1); + } + qemu_thread_create(&threads[n_threads], "test", func, &data[n_threads], + QEMU_THREAD_JOINABLE); + n_threads++; +} + +static void wait_all_threads(void) +{ + int i; + + for (i = 0; i < n_threads; i++) { + qemu_thread_join(&threads[i]); + } + n_threads = 0; +} + +#ifndef TEST_LIST_TYPE +#define TEST_LIST_TYPE 1 +#endif + +struct list_element { +#if TEST_LIST_TYPE == 1 + QLIST_ENTRY(list_element) entry; +#elif TEST_LIST_TYPE == 2 + QSIMPLEQ_ENTRY(list_element) entry; +#elif TEST_LIST_TYPE == 3 + QTAILQ_ENTRY(list_element) entry; +#elif TEST_LIST_TYPE == 4 + QSLIST_ENTRY(list_element) entry; +#else +#error Invalid TEST_LIST_TYPE +#endif + struct rcu_head rcu; +}; + +static void reclaim_list_el(struct rcu_head *prcu) +{ + struct list_element *el = container_of(prcu, struct list_element, rcu); + g_free(el); + /* Accessed only from call_rcu thread. */ + qatomic_set_i64(&n_reclaims, n_reclaims + 1); +} + +#if TEST_LIST_TYPE == 1 +static QLIST_HEAD(, list_element) Q_list_head; + +#define TEST_NAME "qlist" +#define TEST_LIST_REMOVE_RCU QLIST_REMOVE_RCU +#define TEST_LIST_INSERT_AFTER_RCU QLIST_INSERT_AFTER_RCU +#define TEST_LIST_INSERT_HEAD_RCU QLIST_INSERT_HEAD_RCU +#define TEST_LIST_FOREACH_RCU QLIST_FOREACH_RCU +#define TEST_LIST_FOREACH_SAFE_RCU QLIST_FOREACH_SAFE_RCU + +#elif TEST_LIST_TYPE == 2 +static QSIMPLEQ_HEAD(, list_element) Q_list_head = + QSIMPLEQ_HEAD_INITIALIZER(Q_list_head); + +#define TEST_NAME "qsimpleq" +#define TEST_LIST_REMOVE_RCU(el, f) \ + QSIMPLEQ_REMOVE_RCU(&Q_list_head, el, list_element, f) + +#define TEST_LIST_INSERT_AFTER_RCU(list_el, el, f) \ + QSIMPLEQ_INSERT_AFTER_RCU(&Q_list_head, list_el, el, f) + +#define TEST_LIST_INSERT_HEAD_RCU QSIMPLEQ_INSERT_HEAD_RCU +#define TEST_LIST_FOREACH_RCU QSIMPLEQ_FOREACH_RCU +#define TEST_LIST_FOREACH_SAFE_RCU QSIMPLEQ_FOREACH_SAFE_RCU + +#elif TEST_LIST_TYPE == 3 +static QTAILQ_HEAD(, list_element) Q_list_head; + +#define TEST_NAME "qtailq" +#define TEST_LIST_REMOVE_RCU(el, f) QTAILQ_REMOVE_RCU(&Q_list_head, el, f) + +#define TEST_LIST_INSERT_AFTER_RCU(list_el, el, f) \ + QTAILQ_INSERT_AFTER_RCU(&Q_list_head, list_el, el, f) + +#define TEST_LIST_INSERT_HEAD_RCU QTAILQ_INSERT_HEAD_RCU +#define TEST_LIST_FOREACH_RCU QTAILQ_FOREACH_RCU +#define TEST_LIST_FOREACH_SAFE_RCU QTAILQ_FOREACH_SAFE_RCU + +#elif TEST_LIST_TYPE == 4 +static QSLIST_HEAD(, list_element) Q_list_head; + +#define TEST_NAME "qslist" +#define TEST_LIST_REMOVE_RCU(el, f) \ + QSLIST_REMOVE_RCU(&Q_list_head, el, list_element, f) + +#define TEST_LIST_INSERT_AFTER_RCU(list_el, el, f) \ + QSLIST_INSERT_AFTER_RCU(&Q_list_head, list_el, el, f) + +#define TEST_LIST_INSERT_HEAD_RCU QSLIST_INSERT_HEAD_RCU +#define TEST_LIST_FOREACH_RCU QSLIST_FOREACH_RCU +#define TEST_LIST_FOREACH_SAFE_RCU QSLIST_FOREACH_SAFE_RCU +#else +#error Invalid TEST_LIST_TYPE +#endif + +static void *rcu_q_reader(void *arg) +{ + long long n_reads_local = 0; + struct list_element *el; + + rcu_register_thread(); + + *(struct rcu_reader_data **)arg = &rcu_reader; + qatomic_inc(&nthreadsrunning); + while (qatomic_read(&goflag) == GOFLAG_INIT) { + g_usleep(1000); + } + + while (qatomic_read(&goflag) == GOFLAG_RUN) { + rcu_read_lock(); + TEST_LIST_FOREACH_RCU(el, &Q_list_head, entry) { + n_reads_local++; + if (qatomic_read(&goflag) == GOFLAG_STOP) { + break; + } + } + rcu_read_unlock(); + + g_usleep(100); + } + qemu_mutex_lock(&counts_mutex); + n_reads += n_reads_local; + qemu_mutex_unlock(&counts_mutex); + + rcu_unregister_thread(); + return NULL; +} + + +static void *rcu_q_updater(void *arg) +{ + int j, target_el; + long long n_nodes_local = 0; + long long n_updates_local = 0; + long long n_removed_local = 0; + struct list_element *el, *prev_el; + + *(struct rcu_reader_data **)arg = &rcu_reader; + qatomic_inc(&nthreadsrunning); + while (qatomic_read(&goflag) == GOFLAG_INIT) { + g_usleep(1000); + } + + while (qatomic_read(&goflag) == GOFLAG_RUN) { + target_el = select_random_el(RCU_Q_LEN); + j = 0; + /* FOREACH_RCU could work here but let's use both macros */ + TEST_LIST_FOREACH_SAFE_RCU(prev_el, &Q_list_head, entry, el) { + j++; + if (target_el == j) { + TEST_LIST_REMOVE_RCU(prev_el, entry); + /* may be more than one updater in the future */ + call_rcu1(&prev_el->rcu, reclaim_list_el); + n_removed_local++; + break; + } + } + if (qatomic_read(&goflag) == GOFLAG_STOP) { + break; + } + target_el = select_random_el(RCU_Q_LEN); + j = 0; + TEST_LIST_FOREACH_RCU(el, &Q_list_head, entry) { + j++; + if (target_el == j) { + struct list_element *new_el = g_new(struct list_element, 1); + n_nodes_local++; + TEST_LIST_INSERT_AFTER_RCU(el, new_el, entry); + break; + } + } + + n_updates_local += 2; + synchronize_rcu(); + } + synchronize_rcu(); + qemu_mutex_lock(&counts_mutex); + n_nodes += n_nodes_local; + n_updates += n_updates_local; + qatomic_set_i64(&n_nodes_removed, n_nodes_removed + n_removed_local); + qemu_mutex_unlock(&counts_mutex); + return NULL; +} + +static void rcu_qtest_init(void) +{ + struct list_element *new_el; + int i; + nthreadsrunning = 0; + srand(time(0)); + for (i = 0; i < RCU_Q_LEN; i++) { + new_el = g_new(struct list_element, 1); + TEST_LIST_INSERT_HEAD_RCU(&Q_list_head, new_el, entry); + } + qemu_mutex_lock(&counts_mutex); + n_nodes += RCU_Q_LEN; + qemu_mutex_unlock(&counts_mutex); +} + +static void rcu_qtest_run(int duration, int nreaders) +{ + int nthreads = nreaders + 1; + while (qatomic_read(&nthreadsrunning) < nthreads) { + g_usleep(1000); + } + + qatomic_set(&goflag, GOFLAG_RUN); + sleep(duration); + qatomic_set(&goflag, GOFLAG_STOP); + wait_all_threads(); +} + + +static void rcu_qtest(const char *test, int duration, int nreaders) +{ + int i; + long long n_removed_local = 0; + + struct list_element *el, *prev_el; + + rcu_qtest_init(); + for (i = 0; i < nreaders; i++) { + create_thread(rcu_q_reader); + } + create_thread(rcu_q_updater); + rcu_qtest_run(duration, nreaders); + + TEST_LIST_FOREACH_SAFE_RCU(prev_el, &Q_list_head, entry, el) { + TEST_LIST_REMOVE_RCU(prev_el, entry); + call_rcu1(&prev_el->rcu, reclaim_list_el); + n_removed_local++; + } + qemu_mutex_lock(&counts_mutex); + qatomic_set_i64(&n_nodes_removed, n_nodes_removed + n_removed_local); + qemu_mutex_unlock(&counts_mutex); + synchronize_rcu(); + while (qatomic_read_i64(&n_nodes_removed) > + qatomic_read_i64(&n_reclaims)) { + g_usleep(100); + synchronize_rcu(); + } + if (g_test_in_charge) { + g_assert_cmpint(qatomic_read_i64(&n_nodes_removed), ==, + qatomic_read_i64(&n_reclaims)); + } else { + printf("%s: %d readers; 1 updater; nodes read: " \ + "%lld, nodes removed: %"PRIi64"; nodes reclaimed: %"PRIi64"\n", + test, nthreadsrunning - 1, n_reads, + qatomic_read_i64(&n_nodes_removed), + qatomic_read_i64(&n_reclaims)); + exit(0); + } +} + +static void usage(int argc, char *argv[]) +{ + fprintf(stderr, "Usage: %s duration nreaders\n", argv[0]); + exit(-1); +} + +static int gtest_seconds; + +static void gtest_rcuq_one(void) +{ + rcu_qtest("rcuqtest", gtest_seconds / 4, 1); +} + +static void gtest_rcuq_few(void) +{ + rcu_qtest("rcuqtest", gtest_seconds / 4, 5); +} + +static void gtest_rcuq_many(void) +{ + rcu_qtest("rcuqtest", gtest_seconds / 2, 20); +} + + +int main(int argc, char *argv[]) +{ + int duration = 0, readers = 0; + + qemu_mutex_init(&counts_mutex); + if (argc >= 2) { + if (argv[1][0] == '-') { + g_test_init(&argc, &argv, NULL); + if (g_test_quick()) { + gtest_seconds = 4; + } else { + gtest_seconds = 20; + } + g_test_add_func("/rcu/"TEST_NAME"/single-threaded", gtest_rcuq_one); + g_test_add_func("/rcu/"TEST_NAME"/short-few", gtest_rcuq_few); + g_test_add_func("/rcu/"TEST_NAME"/long-many", gtest_rcuq_many); + g_test_in_charge = 1; + return g_test_run(); + } + duration = strtoul(argv[1], NULL, 0); + } + if (argc >= 3) { + readers = strtoul(argv[2], NULL, 0); + } + if (duration && readers) { + rcu_qtest(argv[0], duration, readers); + return 0; + } + + usage(argc, argv); + return -1; +} |