From: Steven Rostedt Date: Mon, 12 May 2008 19:20:55 +0000 (+0200) Subject: ftrace: add UNINTERRUPTIBLE state for kftraced on disable X-Git-Tag: firefly_0821_release~19697^2^2~1^2~65 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=07a267cdd2fd7d1de9455b1e36a1635ace7276c7;p=firefly-linux-kernel-4.4.55.git ftrace: add UNINTERRUPTIBLE state for kftraced on disable When dynamic ftrace fails and sets itself disabled, the ftraced daemon will go back to sleep everytime it wakes up. The setting of the ftraced state to UNINTERRUPTIBLE is skipped in this process, and the daemon takes up 100% of the CPU. This patch makes sure the ftraced daemon sets itself to UNINTERRUPTIBLE in that loop. Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 281d97a3208c..40f64f7cd850 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -630,10 +630,10 @@ static int ftraced(void *ignore) { unsigned long usecs; - set_current_state(TASK_INTERRUPTIBLE); - while (!kthread_should_stop()) { + set_current_state(TASK_INTERRUPTIBLE); + /* check once a second */ schedule_timeout(HZ); @@ -667,8 +667,6 @@ static int ftraced(void *ignore) wake_up_interruptible(&ftraced_waiters); ftrace_shutdown_replenish(); - - set_current_state(TASK_INTERRUPTIBLE); } __set_current_state(TASK_RUNNING); return 0;