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-rw-r--r--Documentation/sysctl/kernel.txt38
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 9886c3d57fc2..c14374e71775 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -75,8 +75,10 @@ show up in /proc/sys/kernel:
- shmall
- shmmax [ sysv ipc ]
- shmmni
+- softlockup_all_cpu_backtrace
- stop-a [ SPARC only ]
- sysrq ==> Documentation/sysrq.txt
+- sysctl_writes_strict
- tainted
- threads-max
- unknown_nmi_panic
@@ -762,6 +764,42 @@ without users and with a dead originative process will be destroyed.
==============================================================
+sysctl_writes_strict:
+
+Control how file position affects the behavior of updating sysctl values
+via the /proc/sys interface:
+
+ -1 - Legacy per-write sysctl value handling, with no printk warnings.
+ Each write syscall must fully contain the sysctl value to be
+ written, and multiple writes on the same sysctl file descriptor
+ will rewrite the sysctl value, regardless of file position.
+ 0 - (default) Same behavior as above, but warn about processes that
+ perform writes to a sysctl file descriptor when the file position
+ is not 0.
+ 1 - Respect file position when writing sysctl strings. Multiple writes
+ will append to the sysctl value buffer. Anything past the max length
+ of the sysctl value buffer will be ignored. Writes to numeric sysctl
+ entries must always be at file position 0 and the value must be
+ fully contained in the buffer sent in the write syscall.
+
+==============================================================
+
+softlockup_all_cpu_backtrace:
+
+This value controls the soft lockup detector thread's behavior
+when a soft lockup condition is detected as to whether or not
+to gather further debug information. If enabled, each cpu will
+be issued an NMI and instructed to capture stack trace.
+
+This feature is only applicable for architectures which support
+NMI.
+
+0: do nothing. This is the default behavior.
+
+1: on detection capture more debug information.
+
+==============================================================
+
tainted:
Non-zero if the kernel has been tainted. Numeric values, which