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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 /arch/i386/kernel/nmi.c
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 'arch/i386/kernel/nmi.c')
-rw-r--r--arch/i386/kernel/nmi.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c
index 8bbdbda07a2d..0178457db721 100644
--- a/arch/i386/kernel/nmi.c
+++ b/arch/i386/kernel/nmi.c
@@ -478,6 +478,11 @@ void touch_nmi_watchdog (void)
478 */ 478 */
479 for (i = 0; i < NR_CPUS; i++) 479 for (i = 0; i < NR_CPUS; i++)
480 alert_counter[i] = 0; 480 alert_counter[i] = 0;
481
482 /*
483 * Tickle the softlockup detector too:
484 */
485 touch_softlockup_watchdog();
481} 486}
482 487
483extern void die_nmi(struct pt_regs *, const char *msg); 488extern void die_nmi(struct pt_regs *, const char *msg);