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authorIngo Molnar <mingo@elte.hu>2005-09-06 18:16:27 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-07 19:57:17 -0400
commit8446f1d391f3d27e6bf9c43d4cbcdac0ca720417 (patch)
tree738853af877c9a391b4f2db467e7f90c6e2e38ed /kernel/power
parent4732efbeb997189d9f9b04708dc26bf8613ed721 (diff)
[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/power')
-rw-r--r--kernel/power/swsusp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index eaacd5cb5889..d967e875ee82 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -1059,6 +1059,7 @@ int swsusp_resume(void)
1059 BUG_ON(!error); 1059 BUG_ON(!error);
1060 restore_processor_state(); 1060 restore_processor_state();
1061 restore_highmem(); 1061 restore_highmem();
1062 touch_softlockup_watchdog();
1062 device_power_up(); 1063 device_power_up();
1063 local_irq_enable(); 1064 local_irq_enable();
1064 return error; 1065 return error;