tests/test-thread-pool.c

   1 #include <glib.h>
   2 #include "qemu-common.h"
   3 #include "block/aio.h"
   4 #include "block/thread-pool.h"
   5 #include "block/block.h"
   6
   7 static int active;
   8
   9 typedef struct {
  10     BlockDriverAIOCB *aiocb;
  11     int n;
  12     int ret;
  13 } WorkerTestData;
  14
  15 static int worker_cb(void *opaque)
  16 {
  17     WorkerTestData *data = opaque;
  18     return __sync_fetch_and_add(&data->n, 1);
  19 }
  20
  21 static int long_cb(void *opaque)
  22 {
  23     WorkerTestData *data = opaque;
  24     __sync_fetch_and_add(&data->n, 1);
  25     g_usleep(2000000);
  26     __sync_fetch_and_add(&data->n, 1);
  27     return 0;
  28 }
  29
  30 static void done_cb(void *opaque, int ret)
  31 {
  32     WorkerTestData *data = opaque;
  33     g_assert_cmpint(data->ret, ==, -EINPROGRESS);
  34     data->ret = ret;
  35     data->aiocb = NULL;
  36
  37     /* Callbacks are serialized, so no need to use atomic ops.  */
  38     active--;
  39 }
  40
  41 /* A non-blocking poll of the main AIO context (we cannot use aio_poll
  42  * because we do not know the AioContext).
  43  */
  44 static void qemu_aio_wait_nonblocking(void)
  45 {
  46     qemu_notify_event();
  47     qemu_aio_wait();
  48 }
  49
  50 /* Wait until all aio and bh activity has finished */
  51 static void qemu_aio_wait_all(void)
  52 {
  53     while (qemu_aio_wait()) {
  54         /* Do nothing */
  55     }
  56 }
  57
  58 static void test_submit(void)
  59 {
  60     WorkerTestData data = { .n = 0 };
  61     thread_pool_submit(worker_cb, &data);
  62     qemu_aio_wait_all();
  63     g_assert_cmpint(data.n, ==, 1);
  64 }
  65
  66 static void test_submit_aio(void)
  67 {
  68     WorkerTestData data = { .n = 0, .ret = -EINPROGRESS };
  69     data.aiocb = thread_pool_submit_aio(worker_cb, &data, done_cb, &data);
  70
  71     /* The callbacks are not called until after the first wait.  */
  72     active = 1;
  73     g_assert_cmpint(data.ret, ==, -EINPROGRESS);
  74     qemu_aio_wait_all();
  75     g_assert_cmpint(active, ==, 0);
  76     g_assert_cmpint(data.n, ==, 1);
  77     g_assert_cmpint(data.ret, ==, 0);
  78 }
  79
  80 static void co_test_cb(void *opaque)
  81 {
  82     WorkerTestData *data = opaque;
  83
  84     active = 1;
  85     data->n = 0;
  86     data->ret = -EINPROGRESS;
  87     thread_pool_submit_co(worker_cb, data);
  88
  89     /* The test continues in test_submit_co, after qemu_coroutine_enter... */
  90
  91     g_assert_cmpint(data->n, ==, 1);
  92     data->ret = 0;
  93     active--;
  94
  95     /* The test continues in test_submit_co, after qemu_aio_wait_all... */
  96 }
  97
  98 static void test_submit_co(void)
  99 {
 100     WorkerTestData data;
 101     Coroutine *co = qemu_coroutine_create(co_test_cb);
 102
 103     qemu_coroutine_enter(co, &data);
 104
 105     /* Back here once the worker has started.  */
 106
 107     g_assert_cmpint(active, ==, 1);
 108     g_assert_cmpint(data.ret, ==, -EINPROGRESS);
 109
 110     /* qemu_aio_wait_all will execute the rest of the coroutine.  */
 111
 112     qemu_aio_wait_all();
 113
 114     /* Back here after the coroutine has finished.  */
 115
 116     g_assert_cmpint(active, ==, 0);
 117     g_assert_cmpint(data.ret, ==, 0);
 118 }
 119
 120 static void test_submit_many(void)
 121 {
 122     WorkerTestData data[100];
 123     int i;
 124
 125     /* Start more work items than there will be threads.  */
 126     for (i = 0; i < 100; i++) {
 127         data[i].n = 0;
 128         data[i].ret = -EINPROGRESS;
 129         thread_pool_submit_aio(worker_cb, &data[i], done_cb, &data[i]);
 130     }
 131
 132     active = 100;
 133     while (active > 0) {
 134         qemu_aio_wait();
 135     }
 136     for (i = 0; i < 100; i++) {
 137         g_assert_cmpint(data[i].n, ==, 1);
 138         g_assert_cmpint(data[i].ret, ==, 0);
 139     }
 140 }
 141
 142 static void test_cancel(void)
 143 {
 144     WorkerTestData data[100];
 145     int num_canceled;
 146     int i;
 147
 148     /* Start more work items than there will be threads, to ensure
 149      * the pool is full.
 150      */
 151     test_submit_many();
 152
 153     /* Start long running jobs, to ensure we can cancel some.  */
 154     for (i = 0; i < 100; i++) {
 155         data[i].n = 0;
 156         data[i].ret = -EINPROGRESS;
 157         data[i].aiocb = thread_pool_submit_aio(long_cb, &data[i],
 158                                                done_cb, &data[i]);
 159     }
 160
 161     /* Starting the threads may be left to a bottom half.  Let it
 162      * run, but do not waste too much time...
 163      */
 164     active = 100;
 165     qemu_aio_wait_nonblocking();
 166
 167     /* Wait some time for the threads to start, with some sanity
 168      * testing on the behavior of the scheduler...
 169      */
 170     g_assert_cmpint(active, ==, 100);
 171     g_usleep(1000000);
 172     g_assert_cmpint(active, >, 50);
 173
 174     /* Cancel the jobs that haven't been started yet.  */
 175     num_canceled = 0;
 176     for (i = 0; i < 100; i++) {
 177         if (__sync_val_compare_and_swap(&data[i].n, 0, 3) == 0) {
 178             data[i].ret = -ECANCELED;
 179             bdrv_aio_cancel(data[i].aiocb);
 180             active--;
 181             num_canceled++;
 182         }
 183     }
 184     g_assert_cmpint(active, >, 0);
 185     g_assert_cmpint(num_canceled, <, 100);
 186
 187     /* Canceling the others will be a blocking operation.  */
 188     for (i = 0; i < 100; i++) {
 189         if (data[i].n != 3) {
 190             bdrv_aio_cancel(data[i].aiocb);
 191         }
 192     }
 193
 194     /* Finish execution and execute any remaining callbacks.  */
 195     qemu_aio_wait_all();
 196     g_assert_cmpint(active, ==, 0);
 197     for (i = 0; i < 100; i++) {
 198         if (data[i].n == 3) {
 199             g_assert_cmpint(data[i].ret, ==, -ECANCELED);
 200             g_assert(data[i].aiocb != NULL);
 201         } else {
 202             g_assert_cmpint(data[i].n, ==, 2);
 203             g_assert_cmpint(data[i].ret, ==, 0);
 204             g_assert(data[i].aiocb == NULL);
 205         }
 206     }
 207 }
 208
 209 int main(int argc, char **argv)
 210 {
 211     /* These should be removed once each AioContext has its thread pool.
 212      * The test should create its own AioContext.
 213      */
 214     qemu_init_main_loop();
 215     bdrv_init();
 216
 217     g_test_init(&argc, &argv, NULL);
 218     g_test_add_func("/thread-pool/submit", test_submit);
 219     g_test_add_func("/thread-pool/submit-aio", test_submit_aio);
 220     g_test_add_func("/thread-pool/submit-co", test_submit_co);
 221     g_test_add_func("/thread-pool/submit-many", test_submit_many);
 222     g_test_add_func("/thread-pool/cancel", test_cancel);
 223     return g_test_run();
 224 }