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[PATCH] timer-irq-driven soft-watchdog, cleanups

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Make the softlockup detector purely timer-interrupt driven, removing
softirq-context (timer) dependencies.  This means that if the softlockup
watchdog triggers, it has truly observed a longer than 10 seconds
scheduling delay of a SCHED_FIFO prio 99 task.

(the patch also turns off the softlockup detector during the initial bootup
phase and does small style fixes)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar
2006-03-24 03:18:41 -08:00
committed by Linus Torvalds
parent 6a4d11c2ab
commit 6687a97d40
3 changed files with 33 additions and 27 deletions
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2
kernel/timer.c
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@@ -915,6 +915,7 @@ static void run_timer_softirq(struct softirq_action *h)
void run_local_timers(void)
{
raise_softirq(TIMER_SOFTIRQ);
softlockup_tick();
}
/*
@@ -945,7 +946,6 @@ void do_timer(struct pt_regs *regs)
/* prevent loading jiffies before storing new jiffies_64 value. */
barrier();
update_times();
softlockup_tick(regs);
}
#ifdef __ARCH_WANT_SYS_ALARM