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authorThomas Gleixner <tglx@linutronix.de>2011-07-17 14:47:54 -0400
committerIngo Molnar <mingo@elte.hu>2011-10-06 06:47:08 -0400
commit510f5acc4f4fb07f3f075900dc468d6e380beff6 (patch)
tree4ecbc827da461c0a5c2ea41480ea42804fc63440 /kernel
parent1c83437e80186832a9a48dbb6b8868d28e40e562 (diff)
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index ce9a9e7db116..24637c782002 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6021,7 +6021,7 @@ void show_state_filter(unsigned long state_filter)
6021 printk(KERN_INFO 6021 printk(KERN_INFO
6022 " task PC stack pid father\n"); 6022 " task PC stack pid father\n");
6023#endif 6023#endif
6024 read_lock(&tasklist_lock); 6024 rcu_read_lock();
6025 do_each_thread(g, p) { 6025 do_each_thread(g, p) {
6026 /* 6026 /*
6027 * reset the NMI-timeout, listing all files on a slow 6027 * reset the NMI-timeout, listing all files on a slow
@@ -6037,7 +6037,7 @@ void show_state_filter(unsigned long state_filter)
6037#ifdef CONFIG_SCHED_DEBUG 6037#ifdef CONFIG_SCHED_DEBUG
6038 sysrq_sched_debug_show(); 6038 sysrq_sched_debug_show();
6039#endif 6039#endif
6040 read_unlock(&tasklist_lock); 6040 rcu_read_unlock();
6041 /* 6041 /*
6042 * Only show locks if all tasks are dumped: 6042 * Only show locks if all tasks are dumped:
6043 */ 6043 */