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nmi_watchdog: Config option to enable new nmi_watchdog

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These are the bits that enable the new nmi_watchdog and safely
isolate the old nmi_watchdog.  Only one or the other can run,
not both at the same time.

Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: gorcunov@gmail.com
Cc: aris@redhat.com
Cc: peterz@infradead.org
LKML-Reference: <1265424425-31562-4-git-send-email-dzickus@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Don Zickus
2010-02-05 21:47:05 -05:00
committed by Ingo Molnar
parent 1fb9d6ad27
commit 84e478c6f1
5 changed files with 26 additions and 1 deletions
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13
lib/Kconfig.debug
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@@ -170,6 +170,19 @@ config DETECT_SOFTLOCKUP
can be detected via the NMI-watchdog, on platforms that
support it.)
config NMI_WATCHDOG
bool "Detect Hard Lockups with an NMI Watchdog"
depends on DEBUG_KERNEL && PERF_EVENTS
default y
help
Say Y here to enable the kernel to use the NMI as a watchdog
to detect hard lockups. This is useful when a cpu hangs for no
reason but can still respond to NMIs. A backtrace is displayed
for reviewing and reporting.
The overhead should be minimal, just an extra NMI every few
seconds.
config BOOTPARAM_SOFTLOCKUP_PANIC
bool "Panic (Reboot) On Soft Lockups"
depends on DETECT_SOFTLOCKUP