From: "Paul E. McKenney" <paulmck@kernel.org>
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com,
rostedt@goodmis.org, "Paul E. McKenney" <paulmck@kernel.org>
Subject: [PATCH rcu 1/7] torture: Seed torture_random_state on CPU
Date: Wed, 4 Jan 2023 16:44:50 -0800 [thread overview]
Message-ID: <20230105004501.1771332-2-paulmck@kernel.org> (raw)
In-Reply-To: <20230105004454.GA1771168@paulmck-ThinkPad-P17-Gen-1>
The DEFINE_TORTURE_RANDOM_PERCPU() macro defines per-CPU random-number
generators for torture testing, but the seeds for each CPU's instance
will be identical if they are first used at the same time. This commit
therefore adds the CPU number to the mix when reseeding.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/torture.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/torture.c b/kernel/torture.c
index 789aeb0e1159c..29afc62f2bfec 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -450,7 +450,7 @@ unsigned long
torture_random(struct torture_random_state *trsp)
{
if (--trsp->trs_count < 0) {
- trsp->trs_state += (unsigned long)local_clock();
+ trsp->trs_state += (unsigned long)local_clock() + raw_smp_processor_id();
trsp->trs_count = TORTURE_RANDOM_REFRESH;
}
trsp->trs_state = trsp->trs_state * TORTURE_RANDOM_MULT +
--
2.31.1.189.g2e36527f23
next prev parent reply other threads:[~2023-01-05 0:50 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-05 0:44 [PATCH rcu 0/7] Torture-test updates for v6.3 Paul E. McKenney
2023-01-05 0:44 ` [PATCH rcu 1/6] rcu-tasks: Use accurate runstart time for RCU Tasks boot-time testing Paul E. McKenney
2023-01-05 0:44 ` Paul E. McKenney [this message]
2023-01-05 0:44 ` [PATCH rcu 2/6] rcu-tasks: Improve comments explaining tasks_rcu_exit_srcu purpose Paul E. McKenney
2023-01-05 0:44 ` [PATCH rcu 2/7] refscale: Provide for initialization failure Paul E. McKenney
2023-01-05 0:44 ` [PATCH rcu 3/6] rcu-tasks: Remove preemption disablement around srcu_read_[un]lock() calls Paul E. McKenney
2023-01-05 0:44 ` [PATCH rcu 3/7] refscale: Add tests using SLAB_TYPESAFE_BY_RCU Paul E. McKenney
2023-01-05 0:44 ` [PATCH rcu 4/7] locktorture: Allow non-rtmutex lock types to be boosted Paul E. McKenney
2023-01-05 0:44 ` [PATCH rcu 4/6] rcu-tasks: Fix synchronize_rcu_tasks() VS zap_pid_ns_processes() Paul E. McKenney
2023-01-05 0:44 ` [PATCH rcu 5/7] locktorture: Make the rt_boost factor a tunable Paul E. McKenney
2023-01-05 0:44 ` [PATCH rcu 5/6] rcu-tasks: Make rude RCU-Tasks work well with CPU hotplug Paul E. McKenney
2023-01-05 0:44 ` [PATCH rcu 6/6] rcu-tasks: Handle queue-shrink/callback-enqueue race condition Paul E. McKenney
2023-01-05 0:45 ` [PATCH rcu 6/7] rcutorture: Drop sparse lock-acquisition annotations Paul E. McKenney
2023-01-05 0:45 ` [PATCH rcu 7/7] torture: Fix hang during kthread shutdown phase Paul E. McKenney
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