sched: Don't use tasklist_lock for debug prints
Avoid taking locks from debug prints, this avoids latencies on -rt,
and improves reliability of the debug code.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index ce9a9e7..24637c7 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6021,7 +6021,7 @@
printk(KERN_INFO
" task PC stack pid father\n");
#endif
- read_lock(&tasklist_lock);
+ rcu_read_lock();
do_each_thread(g, p) {
/*
* reset the NMI-timeout, listing all files on a slow
@@ -6037,7 +6037,7 @@
#ifdef CONFIG_SCHED_DEBUG
sysrq_sched_debug_show();
#endif
- read_unlock(&tasklist_lock);
+ rcu_read_unlock();
/*
* Only show locks if all tasks are dumped:
*/