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>
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@ -54,6 +54,9 @@ module_param(verbose_sleep_frequency, int, 0444);
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static int verbose_sleep_duration = 1;
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module_param(verbose_sleep_duration, int, 0444);
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static int random_shuffle;
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module_param(random_shuffle, int, 0444);
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static char *torture_type;
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static int verbose;
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@ -518,6 +521,7 @@ static void torture_shuffle_task_unregister_all(void)
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*/
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static void torture_shuffle_tasks(void)
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{
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DEFINE_TORTURE_RANDOM(rand);
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struct shuffle_task *stp;
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cpumask_setall(shuffle_tmp_mask);
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@ -537,8 +541,10 @@ static void torture_shuffle_tasks(void)
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cpumask_clear_cpu(shuffle_idle_cpu, shuffle_tmp_mask);
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mutex_lock(&shuffle_task_mutex);
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list_for_each_entry(stp, &shuffle_task_list, st_l)
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set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask);
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list_for_each_entry(stp, &shuffle_task_list, st_l) {
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if (!random_shuffle || torture_random(&rand) & 0x1)
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set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask);
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}
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mutex_unlock(&shuffle_task_mutex);
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cpus_read_unlock();
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