Implement poll rcu stress test in rcutorture

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I7ee6c78dfc6464494ebb6ee4cbba586c4c57a4bf

diff --git a/tests/regression/rcutorture.h b/tests/regression/rcutorture.h
index 639fcfc19cb2bfe33f765629dd233af04e35267d..49dbff689e9e9da835aa2186a6ec3a711192e1b9 100644 (file)
--- a/tests/regression/rcutorture.h
+++ b/tests/regression/rcutorture.h
@@ -79,6 +79,12 @@ enum callrcu_type {
        CALLRCU_PERTHREAD,
 };
 
+enum writer_state {
+       WRITER_STATE_SYNC_RCU,
+       WRITER_STATE_CALL_RCU,
+       WRITER_STATE_POLL_RCU,
+};
+
 static enum callrcu_type callrcu_type = CALLRCU_GLOBAL;
 
 long long n_reads = 0LL;
@@ -371,12 +377,29 @@ void rcu_update_stress_test_rcu(struct rcu_head *head __attribute__((unused)))
        }
 }
 
+static
+void advance_writer_state(enum writer_state *state)
+{
+       switch (*state) {
+       case WRITER_STATE_SYNC_RCU:
+               *state = WRITER_STATE_CALL_RCU;
+               break;
+       case WRITER_STATE_CALL_RCU:
+               *state = WRITER_STATE_POLL_RCU;
+               break;
+       case WRITER_STATE_POLL_RCU:
+               *state = WRITER_STATE_SYNC_RCU;
+               break;
+       }
+}
+
 static
 void *rcu_update_stress_test(void *arg __attribute__((unused)))
 {
        int i;
        struct rcu_stress *p;
        struct rcu_head rh;
+       enum writer_state writer_state = WRITER_STATE_SYNC_RCU;
 
        while (goflag == GOFLAG_INIT)
                (void) poll(NULL, 0, 1);
@@ -394,9 +417,12 @@ void *rcu_update_stress_test(void *arg __attribute__((unused)))
                for (i = 0; i < RCU_STRESS_PIPE_LEN; i++)
                        if (i != rcu_stress_idx)
                                rcu_stress_array[i].pipe_count++;
-               if (n_updates & 0x1)
+               switch (writer_state) {
+               case WRITER_STATE_SYNC_RCU:
                        synchronize_rcu();
-               else {
+                       break;
+               case WRITER_STATE_CALL_RCU:
+               {
                        int ret;
 
                        ret = pthread_mutex_lock(&call_rcu_test_mutex);
@@ -438,8 +464,22 @@ void *rcu_update_stress_test(void *arg __attribute__((unused)))
                                        strerror(errno));
                                abort();
                        }
+                       break;
+               }
+               case WRITER_STATE_POLL_RCU:
+               {
+                       struct urcu_gp_poll_state poll_state;
+
+                       rcu_register_thread();
+                       poll_state = start_poll_synchronize_rcu();
+                       rcu_unregister_thread();
+                       while (!poll_state_synchronize_rcu(poll_state))
+                               (void) poll(NULL, 0, 1);        /* Wait for 1ms */
+                       break;
+               }
                }
                n_updates++;
+               advance_writer_state(&writer_state);
        }
 
        return NULL;