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qht-bench: relax test_start/stop atomic accesses 

test_start/stop are used only as flags to loop on. Barriers are unnecessary,
since no dependent data is transferred among threads apart from the flags
themselves.

This commit relaxes the three accesses to test_start/stop that were
not yet relaxed.

Signed-off-by: Emilio G. Cota <cota@braap.org>
This commit is contained in:
Emilio G. Cota 2016-10-14 11:54:51 +02:00 committed by Paolo Bonzini
parent 803cf26a9e
commit 977ec47de0
1 changed files with 3 additions and 3 deletions
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6
tests/qht-bench.c
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@ -193,7 +193,7 @@ static void *thread_func(void *p)
rcu_register_thread();
atomic_inc(&n_ready_threads);
while (!atomic_mb_read(&test_start)) {
while (!atomic_read(&test_start)) {
cpu_relax();
}
@ -393,11 +393,11 @@ static void run_test(void)
while (atomic_read(&n_ready_threads) != n_rw_threads + n_rz_threads) {
cpu_relax();
}
atomic_mb_set(&test_start, true);
atomic_set(&test_start, true);
do {
remaining = sleep(duration);
} while (remaining);
atomic_mb_set(&test_stop, true);
atomic_set(&test_stop, true);
for (i = 0; i < n_rw_threads; i++) {
qemu_thread_join(&rw_threads[i]);