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authorIngo Molnar <mingo@elte.hu>2005-09-06 15:16:27 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-07 16:57:17 -0700
commit8446f1d391f3d27e6bf9c43d4cbcdac0ca720417 (patch)
tree738853af877c9a391b4f2db467e7f90c6e2e38ed /kernel/timer.c
parent4732efbeb997189d9f9b04708dc26bf8613ed721 (diff)
downloadlwn-8446f1d391f3d27e6bf9c43d4cbcdac0ca720417.tar.gz
lwn-8446f1d391f3d27e6bf9c43d4cbcdac0ca720417.zip
[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 <mingo@elte.hu> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-Off-By: Matthias Urlichs <smurf@smurf.noris.de> Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/timer.c')
-rw-r--r--kernel/timer.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index 5377f40723ff..1433d87f46b3 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -950,6 +950,7 @@ void do_timer(struct pt_regs *regs)
{
jiffies_64++;
update_times();
+ softlockup_tick(regs);
}
#ifdef __ARCH_WANT_SYS_ALARM