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Commit 510f5acc authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
Browse files

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: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 1c83437e

kernel/sched.c

+2 −2
Original line number Diff line number Diff line
@@ -6021,7 +6021,7 @@ void show_state_filter(unsigned long state_filter) 
	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 @@ void show_state_filter(unsigned long state_filter) 
#ifdef CONFIG_SCHED_DEBUG

	sysrq_sched_debug_show();

#endif

	read_unlock(&tasklist_lock);

	rcu_read_unlock();

	/*

	 * Only show locks if all tasks are dumped:

	 */