Commit-ID: 0e11c8e8a60f8591556d142c2e1e53eaf86ab528
Gitweb: http://git.kernel.org/tip/0e11c8e8a60f8591556d142c2e1e53eaf86ab528
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 10 Jan 2013 16:21:07 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon, 28 Jan 2013 22:19:54 -0800
rcu: Make rcutorture's shuffler task shuffle recently added tasks
A number of kthreads have been added to rcutorture, but the shuffler
task was not informed of them, and thus did not shuffle them. This
commit therefore adds the requisite shuffling, and, while in the area
fixes up some whitespace issues.
However, the shuffling is intended to keep randomly selected CPUs
idle, which means that the RCU priority boosting kthreads need to
avoid waking up every jiffy. This commit also makes that fix.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcutorture.c | 24 ++++++++++++++++++++----
1 file changed, 20 insertions(+), 4 deletions(-)
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index a583f1c..3ebc8bf 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -846,7 +846,7 @@ static int rcu_torture_boost(void *arg)
/* Wait for the next test interval. */
oldstarttime = boost_starttime;
while (ULONG_CMP_LT(jiffies, oldstarttime)) {
- schedule_timeout_uninterruptible(1);
+ schedule_timeout_interruptible(oldstarttime - jiffies);
rcu_stutter_wait("rcu_torture_boost");
if (kthread_should_stop() ||
fullstop != FULLSTOP_DONTSTOP)
@@ -1318,19 +1318,35 @@ static void rcu_torture_shuffle_tasks(void)
set_cpus_allowed_ptr(reader_tasks[i],
shuffle_tmp_mask);
}
-
if (fakewriter_tasks) {
for (i = 0; i < nfakewriters; i++)
if (fakewriter_tasks[i])
set_cpus_allowed_ptr(fakewriter_tasks[i],
shuffle_tmp_mask);
}
-
if (writer_task)
set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask);
-
if (stats_task)
set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask);
+ if (stutter_task)
+ set_cpus_allowed_ptr(stutter_task, shuffle_tmp_mask);
+ if (fqs_task)
+ set_cpus_allowed_ptr(fqs_task, shuffle_tmp_mask);
+ if (shutdown_task)
+ set_cpus_allowed_ptr(shutdown_task, shuffle_tmp_mask);
+#ifdef CONFIG_HOTPLUG_CPU
+ if (onoff_task)
+ set_cpus_allowed_ptr(onoff_task, shuffle_tmp_mask);
+#endif /* #ifdef CONFIG_HOTPLUG_CPU */
+ if (stall_task)
+ set_cpus_allowed_ptr(stall_task, shuffle_tmp_mask);
+ if (barrier_cbs_tasks)
+ for (i = 0; i < n_barrier_cbs; i++)
+ if (barrier_cbs_tasks[i])
+ set_cpus_allowed_ptr(barrier_cbs_tasks[i],
+ shuffle_tmp_mask);
+ if (barrier_task)
+ set_cpus_allowed_ptr(barrier_task, shuffle_tmp_mask);
if (rcu_idle_cpu == -1)
rcu_idle_cpu = num_online_cpus() - 1;
--
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