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authorDon Zickus <dzickus@redhat.com>2006-09-26 10:52:27 +0200
committerAndi Kleen <andi@basil.nowhere.org>2006-09-26 10:52:27 +0200
commite33e89ab1a8d295de0500b697f4f31c3ceee9aa2 (patch)
tree51a7955a1a67f65169278a97d3d54305cb18e8ae /Documentation
parent407984f1af259b31957c7c05075a454a751bb801 (diff)
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[PATCH] x86: Add abilty to enable/disable nmi watchdog from procfs (update)
Adds a new /proc/sys/kernel/nmi_watchdog call that will enable/disable the nmi watchdog. By entering a non-zero value here, a user can enable the nmi watchdog to monitor the online cpus in the system. By entering a zero value here, a user can disable the nmi watchdog and free up a performance counter which could then be utilized by the oprofile subsystem, otherwise oprofile may be short a counter when in use. Signed-off-by: Don Zickus <dzickus@redhat.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/proc.txt14
1 files changed, 9 insertions, 5 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 99902ae6..7db71d6 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -1124,11 +1124,15 @@ debugging information is displayed on console.
NMI switch that most IA32 servers have fires unknown NMI up, for example.
If a system hangs up, try pressing the NMI switch.
-[NOTE]
- This function and oprofile share a NMI callback. Therefore this function
- cannot be enabled when oprofile is activated.
- And NMI watchdog will be disabled when the value in this file is set to
- non-zero.
+nmi_watchdog
+------------
+
+Enables/Disables the NMI watchdog on x86 systems. When the value is non-zero
+the NMI watchdog is enabled and will continuously test all online cpus to
+determine whether or not they are still functioning properly.
+
+Because the NMI watchdog shares registers with oprofile, by disabling the NMI
+watchdog, oprofile may have more registers to utilize.
2.4 /proc/sys/vm - The virtual memory subsystem
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