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authorDon Zickus <dzickus@redhat.com>2006-09-26 04:52:27 -0400
committerAndi Kleen <andi@basil.nowhere.org>2006-09-26 04:52:27 -0400
commite33e89ab1a8d295de0500b697f4f31c3ceee9aa2 (patch)
tree51a7955a1a67f65169278a97d3d54305cb18e8ae /Documentation/filesystems/proc.txt
parent407984f1af259b31957c7c05075a454a751bb801 (diff)
[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/filesystems/proc.txt')
-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 99902ae6804e..7db71d6fba82 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -1124,11 +1124,15 @@ debugging information is displayed on console.
1124NMI switch that most IA32 servers have fires unknown NMI up, for example. 1124NMI switch that most IA32 servers have fires unknown NMI up, for example.
1125If a system hangs up, try pressing the NMI switch. 1125If a system hangs up, try pressing the NMI switch.
1126 1126
1127[NOTE] 1127nmi_watchdog
1128 This function and oprofile share a NMI callback. Therefore this function 1128------------
1129 cannot be enabled when oprofile is activated. 1129
1130 And NMI watchdog will be disabled when the value in this file is set to 1130Enables/Disables the NMI watchdog on x86 systems. When the value is non-zero
1131 non-zero. 1131the NMI watchdog is enabled and will continuously test all online cpus to
1132determine whether or not they are still functioning properly.
1133
1134Because the NMI watchdog shares registers with oprofile, by disabling the NMI
1135watchdog, oprofile may have more registers to utilize.
1132 1136
1133 1137
11342.4 /proc/sys/vm - The virtual memory subsystem 11382.4 /proc/sys/vm - The virtual memory subsystem