summaryrefslogtreecommitdiff
path: root/kernel/torture.c
diff options
context:
space:
mode:
authorConnor O'Brien <connoro@google.com>2023-06-02 22:02:09 +0000
committerPaul E. McKenney <paulmck@kernel.org>2023-07-14 15:04:09 -0700
commite2a0b786c50cf4f0c3abfcd05888ae583c98cf25 (patch)
treeb570255da4bc51b7d0050e25c48c7c17de53e575 /kernel/torture.c
parent9cafe974cf46425c18cf78971400ae12e416e166 (diff)
torture: Support randomized shuffling for proxy exec testing
Currently shuffling sets the same cpu affinities for all tasks, which makes us less likely to hit paths involving migrating blocked tasks onto a cpu where they can't run. This patch adds an element of randomness to allow affinities of different writer tasks to diverge. This has helped uncover issues in testing with Proxy Execution Cc: "Paul E. McKenney" <paulmck@kernel.org> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Valentin Schneider <vschneid@redhat.com> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: kernel-team@android.com Signed-off-by: Connor O'Brien <connoro@google.com> Signed-off-by: John Stultz <jstultz@google.com> Acked-by: Davidlohr Bueso <dave@stgolabs.net> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/torture.c')
-rw-r--r--kernel/torture.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/kernel/torture.c b/kernel/torture.c
index 1a0519b836ac..8be83fdc6be1 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -54,6 +54,9 @@ module_param(verbose_sleep_frequency, int, 0444);
static int verbose_sleep_duration = 1;
module_param(verbose_sleep_duration, int, 0444);
+static int random_shuffle;
+module_param(random_shuffle, int, 0444);
+
static char *torture_type;
static int verbose;
@@ -518,6 +521,7 @@ static void torture_shuffle_task_unregister_all(void)
*/
static void torture_shuffle_tasks(void)
{
+ DEFINE_TORTURE_RANDOM(rand);
struct shuffle_task *stp;
cpumask_setall(shuffle_tmp_mask);
@@ -537,8 +541,10 @@ static void torture_shuffle_tasks(void)
cpumask_clear_cpu(shuffle_idle_cpu, shuffle_tmp_mask);
mutex_lock(&shuffle_task_mutex);
- list_for_each_entry(stp, &shuffle_task_list, st_l)
- set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask);
+ list_for_each_entry(stp, &shuffle_task_list, st_l) {
+ if (!random_shuffle || torture_random(&rand) & 0x1)
+ set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask);
+ }
mutex_unlock(&shuffle_task_mutex);
cpus_read_unlock();