[PATCH 01/23] torture: Share torture_random_state with torture_shuffle_tasks()

Frederic Weisbecker
2023-10-10T11:59:43Z

Both torture_shuffle_tasks() and its caller torture_shuffle()
define a torture_random_state structure. This is suboptimal given
that torture_shuffle_tasks() runs for a very short period of time.
This commit therefore causes torture_shuffle() to pass a pointer to its
torture_random_state structure down to torture_shuffle_tasks().

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
---
kernel/torture.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/kernel/torture.c b/kernel/torture.c
index b28b05bbef02..68dba4ecab5c 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -520,9 +520,8 @@ static void torture_shuffle_task_unregister_all(void)
* A special case is when shuffle_idle_cpu = -1, in which case we allow
* the tasks to run on all CPUs.
*/
-static void torture_shuffle_tasks(void)
+static void torture_shuffle_tasks(struct torture_random_state *trp)
{
- DEFINE_TORTURE_RANDOM(rand);
struct shuffle_task *stp;

cpumask_setall(shuffle_tmp_mask);
@@ -543,7 +542,7 @@ static void torture_shuffle_tasks(void)

mutex_lock(&shuffle_task_mutex);
list_for_each_entry(stp, &shuffle_task_list, st_l) {
- if (!random_shuffle || torture_random(&rand) & 0x1)
+ if (!random_shuffle || torture_random(trp) & 0x1)
set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask);
}
mutex_unlock(&shuffle_task_mutex);
@@ -562,7 +561,7 @@ static int torture_shuffle(void *arg)
VERBOSE_TOROUT_STRING("torture_shuffle task started");
do {
torture_hrtimeout_jiffies(shuffle_interval, &rand);
- torture_shuffle_tasks();
+ torture_shuffle_tasks(&rand);
torture_shutdown_absorb("torture_shuffle");
} while (!torture_must_stop());
torture_kthread_stopping("torture_shuffle");
@@ -673,7 +672,7 @@ int torture_shutdown_init(int ssecs, void (*cleanup)(void))
if (ssecs > 0) {
shutdown_time = ktime_add(ktime_get(), ktime_set(ssecs, 0));
return torture_create_kthread(torture_shutdown, NULL,
- shutdown_task);
+ shutdown_task);
}
return 0;
}
--
2.34.1