From eb218d4f6b78a5a6e89e65d6416879d91c679141 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Fri, 10 Feb 2023 09:08:04 -0500 Subject: [PATCH] Implement poll rcu stress test in rcutorture Signed-off-by: Mathieu Desnoyers Change-Id: I7ee6c78dfc6464494ebb6ee4cbba586c4c57a4bf --- tests/regression/rcutorture.h | 44 +++++++++++++++++++++++++++++++++-- 1 file changed, 42 insertions(+), 2 deletions(-) diff --git a/tests/regression/rcutorture.h b/tests/regression/rcutorture.h index 639fcfc..49dbff6 100644 --- 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; -- 2.39.5