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| author | Ingo Molnar <mingo@elte.hu> | 2005-09-06 15:16:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-07 16:57:17 -0700 |
| commit | 8446f1d391f3d27e6bf9c43d4cbcdac0ca720417 (patch) | |
| tree | 738853af877c9a391b4f2db467e7f90c6e2e38ed /kernel/timer.c | |
| parent | 4732efbeb997189d9f9b04708dc26bf8613ed721 (diff) | |
| download | lwn-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.c | 1 |
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 |