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authorDon Zickus <dzickus@redhat.com>2010-02-05 21:47:05 -0500
committerIngo Molnar <mingo@elte.hu>2010-02-08 08:29:03 +0100
commit84e478c6f1eb9c4bfa1fff2f8108e9a061b46428 (patch)
tree15be1e0d92d4439e49ecc98a504589dc596fc211 /lib/Kconfig.debug
parent1fb9d6ad2766a1dd70d167552988375049a97f21 (diff)
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nmi_watchdog: Config option to enable new nmi_watchdog
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>
Diffstat (limited to 'lib/Kconfig.debug')
-rw-r--r--lib/Kconfig.debug13
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 25c3ed594c5..f80b67e72aa 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -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