[PATCH tip/core/rcu 10/17] rcutorture: Use hrtimers for reader and writer delays

paulmck
2021-01-06T17:19:29Z

This commit replaces schedule_timeout_uninterruptible() and
schedule_timeout_interruptible() with torture_hrtimeout_us() and
torture_hrtimeout_jiffies() to avoid timer-wheel synchronization.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/rcutorture.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 7b61086..4a0c6e6 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1149,7 +1149,7 @@ rcu_torture_writer(void *arg)

do {
rcu_torture_writer_state = RTWS_FIXED_DELAY;
- schedule_timeout_uninterruptible(1);
+ torture_hrtimeout_us(500, 1000, &rand);
rp = rcu_torture_alloc();
if (rp == NULL)
continue;
@@ -1290,8 +1290,7 @@ rcu_torture_fakewriter(void *arg)
set_user_nice(current, MAX_NICE);

do {
- schedule_timeout_uninterruptible(1 + torture_random(&rand)%10);
- udelay(torture_random(&rand) & 0x3ff);
+ torture_hrtimeout_jiffies(torture_random(&rand) % 10, &rand);
if (cur_ops->cb_barrier != NULL &&
torture_random(&rand) % (nfakewriters * 8) == 0) {
cur_ops->cb_barrier();
@@ -1656,7 +1655,7 @@ rcu_torture_reader(void *arg)
if (!rcu_torture_one_read(&rand, myid) && !torture_must_stop())
schedule_timeout_interruptible(HZ);
if (time_after(jiffies, lastsleep) && !torture_must_stop()) {
- schedule_timeout_interruptible(1);
+ torture_hrtimeout_us(500, 1000, &rand);
lastsleep = jiffies + 10;
}
while (num_online_cpus() < mynumonline && !torture_must_stop())
--
2.9.5