summaryrefslogtreecommitdiff
path: root/Documentation/sysctl/kernel.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/sysctl/kernel.txt')
-rw-r--r--Documentation/sysctl/kernel.txt53
1 files changed, 53 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index a4ccdd1981cf..f11ca7979fa6 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -1,5 +1,6 @@
Documentation for /proc/sys/kernel/* kernel version 2.2.10
(c) 1998, 1999, Rik van Riel <riel@nl.linux.org>
+ (c) 2009, Shen Feng<shen@cn.fujitsu.com>
For general info and legal blurb, please look in README.
@@ -18,6 +19,7 @@ Currently, these files might (depending on your configuration)
show up in /proc/sys/kernel:
- acpi_video_flags
- acct
+- auto_msgmni
- core_pattern
- core_uses_pid
- ctrl-alt-del
@@ -33,6 +35,7 @@ show up in /proc/sys/kernel:
- msgmax
- msgmnb
- msgmni
+- nmi_watchdog
- osrelease
- ostype
- overflowgid
@@ -40,6 +43,7 @@ show up in /proc/sys/kernel:
- panic
- pid_max
- powersave-nap [ PPC only ]
+- panic_on_unrecovered_nmi
- printk
- randomize_va_space
- real-root-dev ==> Documentation/initrd.txt
@@ -55,6 +59,7 @@ show up in /proc/sys/kernel:
- sysrq ==> Documentation/sysrq.txt
- tainted
- threads-max
+- unknown_nmi_panic
- version
==============================================================
@@ -381,3 +386,51 @@ can be ORed together:
512 - A kernel warning has occurred.
1024 - A module from drivers/staging was loaded.
+==============================================================
+
+auto_msgmni:
+
+Enables/Disables automatic recomputing of msgmni upon memory add/remove or
+upon ipc namespace creation/removal (see the msgmni description above).
+Echoing "1" into this file enables msgmni automatic recomputing.
+Echoing "0" turns it off.
+auto_msgmni default value is 1.
+
+==============================================================
+
+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. Currently,
+passing "nmi_watchdog=" parameter at boot time is required for this function
+to work.
+
+If LAPIC NMI watchdog method is in use (nmi_watchdog=2 kernel parameter), the
+NMI watchdog shares registers with oprofile. By disabling the NMI watchdog,
+oprofile may have more registers to utilize.
+
+==============================================================
+
+unknown_nmi_panic:
+
+The value in this file affects behavior of handling NMI. When the value is
+non-zero, unknown NMI is trapped and then panic occurs. At that time, kernel
+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.
+
+==============================================================
+
+panic_on_unrecovered_nmi:
+
+The default Linux behaviour on an NMI of either memory or unknown is to continue
+operation. For many environments such as scientific computing it is preferable
+that the box is taken out and the error dealt with than an uncorrected
+parity/ECC error get propogated.
+
+A small number of systems do generate NMI's for bizarre random reasons such as
+power management so the default is off. That sysctl works like the existing
+panic controls already in that directory.
+