Date: Fri, 6 Feb 2015 20:46:47 +0000 (UTC) From: Garrett Cooper <ngie@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r278329 - head/share/man/man4 Message-ID: <201502062046.t16KklRW023735@svn.freebsd.org>
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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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