[PATCH] detect soft lockups
authorIngo Molnar <mingo@elte.hu>
Tue, 6 Sep 2005 22:16:27 +0000 (15:16 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Wed, 7 Sep 2005 23:57:17 +0000 (16:57 -0700)
commit8446f1d391f3d27e6bf9c43d4cbcdac0ca720417
tree738853af877c9a391b4f2db467e7f90c6e2e38ed
parent4732efbeb997189d9f9b04708dc26bf8613ed721
[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>
12 files changed:
arch/i386/kernel/nmi.c
arch/i386/kernel/time.c
arch/x86_64/kernel/nmi.c
arch/x86_64/kernel/time.c
drivers/mtd/nand/nand_base.c
include/linux/sched.h
init/main.c
kernel/Makefile
kernel/power/swsusp.c
kernel/softlockup.c [new file with mode: 0644]
kernel/timer.c
lib/Kconfig.debug