svn commit: r278329 - head/share/man/man4
Garrett Cooper
ngie at FreeBSD.org
Fri Feb 6 20:46:48 UTC 2015
Author: ngie
Date: Fri Feb 6 20:46:46 2015
New Revision: 278329
URL: https://svnweb.freebsd.org/changeset/base/278329
Log:
Document WITNESS_COUNT and WITNESS_NO_VNODE
Reviewed by: bcr, kib
Differential Revision: D1789
MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division
Modified:
head/share/man/man4/witness.4
Modified: head/share/man/man4/witness.4
==============================================================================
--- head/share/man/man4/witness.4 Fri Feb 6 19:44:26 2015 (r278328)
+++ head/share/man/man4/witness.4 Fri Feb 6 20:46:46 2015 (r278329)
@@ -32,7 +32,9 @@
.Nd lock validation facility
.Sh SYNOPSIS
.Cd options WITNESS
+.Cd options WITNESS_COUNT
.Cd options WITNESS_KDB
+.Cd options WITNESS_NO_VNODE
.Cd options WITNESS_SKIPSPIN
.Sh DESCRIPTION
The
@@ -56,6 +58,28 @@ does not recurse on a non-recursive lock
or attempt an upgrade on a shared lock held by another thread.
If any of these checks fail, then the kernel will panic.
.Pp
+The
+.Dv WITNESS_COUNT
+kernel option controls the maximum number of
+.Xr witness 4
+entries that are tracked in the kernel.
+The maximum number of entries can be queried via the
+.Va debug.witness.count
+sysctl.
+It can also be set from the
+.Xr loader 8
+via the
+.Va debug.witness.count
+environment variable.
+.Pp
+The
+.Dv WITNESS_NO_VNODE
+kernel option tells
+.Xr witness 4
+to ignore locking issues between
+.Xr vnode 9
+objects.
+.Pp
The flag that controls whether or not the kernel debugger is entered when a
lock order violation is detected can be set in a variety of ways.
By default, the flag is off, but if the
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