Module Name: src
Committed By: perry
Date: Fri Apr 10 22:58:33 UTC 2009
Modified Files:
src/share/man/man4: options.4
Log Message:
LOCKDEBUG docs. Written by joerg.
To generate a diff of this commit:
cvs rdiff -u -r1.377 -r1.378 src/share/man/man4/options.4
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/share/man/man4/options.4
diff -u src/share/man/man4/options.4:1.377 src/share/man/man4/options.4:1.378
--- src/share/man/man4/options.4:1.377 Fri Apr 10 22:26:10 2009
+++ src/share/man/man4/options.4 Fri Apr 10 22:58:33 2009
@@ -1,4 +1,4 @@
-.\" $NetBSD: options.4,v 1.377 2009/04/10 22:26:10 ad Exp $
+.\" $NetBSD: options.4,v 1.378 2009/04/10 22:58:33 perry Exp $
.\"
.\" Copyright (c) 1996
.\" Perry E. Metzger. All rights reserved.
@@ -616,6 +616,17 @@
This code will cause the kernel to panic if corruption of internal data
structures is detected.
These checks can decrease performance up to 15%.
+.It Cd options LOCKDEBUG
+Adds code to the kernel to detect incorrect use of locking primitives
+(mutex, rwlock, simplelock).
+This code will cause the kernel to check for dead lock conditions.
+It will also check for memory being freed to not contain initialised
+lock primitives.
+Functions for use in
+.Xr ddb 4
+to check lock chains etc. are also enabled.
+These checks are very expensive and can decrease performance on
+multi-processor machines by a factor of three.
.It Cd options KSTACK_CHECK_MAGIC
Check kernel stack usage and panic if stack overflow is detected.
This check is performance sensitive because it scans stack on each context
