From 8446f1d391f3d27e6bf9c43d4cbcdac0ca720417 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Tue, 6 Sep 2005 15:16:27 -0700 Subject: [PATCH] detect soft lockups This patch adds a new kernel debug feature: CONFIG_DETECT_SOFTLOCKUP. When enabled then per-CPU watchdog threads are started, which try to run once per second. If they get delayed for more than 10 seconds then a callback from the timer interrupt detects this condition and prints out a warning message and a stack dump (once per lockup incident). The feature is otherwise non-intrusive, it doesnt try to unlock the box in any way, it only gets the debug info out, automatically, and on all CPUs affected by the lockup. Signed-off-by: Ingo Molnar Signed-off-by: Nishanth Aravamudan Signed-Off-By: Matthias Urlichs Signed-off-by: Richard Purdie Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/time.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/i386/kernel/time.c') diff --git a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c index 6f794a78ee1e..b0c5ee2b3446 100644 --- a/arch/i386/kernel/time.c +++ b/arch/i386/kernel/time.c @@ -422,6 +422,7 @@ static int timer_resume(struct sys_device *dev) last_timer->resume(); cur_timer = last_timer; last_timer = NULL; + touch_softlockup_watchdog(); return 0; } -- cgit v1.2.3-59-g8ed1b