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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>
This commit is contained in:
Thomas Gleixner 2011-07-17 20:47:54 +02:00 committed by Ingo Molnar
parent 1c83437e80
commit 510f5acc4f
1 changed files with 2 additions and 2 deletions
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4
kernel/sched.c
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@ -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:
*/