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

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Date:   Wed,  6 Jan 2021 09:17:03 -0800
From:   paulmck@...nel.org
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH tip/core/rcu 10/17] rcutorture: Use hrtimers for reader and writer delays

From: "Paul E. McKenney" <paulmck@...nel.org>

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@...nel.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