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ftrace: add UNINTERRUPTIBLE state for kftraced on disable

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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 <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Steven Rostedt 2008-05-12 21:20:55 +02:00 committed by Thomas Gleixner
parent c1d2327b36
commit 07a267cdd2
1 changed files with 2 additions and 4 deletions
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6
kernel/trace/ftrace.c
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@ -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;