Date: Thu, 20 Jul 2017 01:12:31 +0000 (UTC) From: Ngie Cooper <ngie@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r321279 - stable/10/share/man/man4 Message-ID: <201707200112.v6K1CVKN043074@repo.freebsd.org>
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Author: ngie Date: Thu Jul 20 01:12:31 2017 New Revision: 321279 URL: https://svnweb.freebsd.org/changeset/base/321279 Log: MFC r278329: Document WITNESS_COUNT and WITNESS_NO_VNODE Modified: stable/10/share/man/man4/witness.4 Directory Properties: stable/10/ (props changed) Modified: stable/10/share/man/man4/witness.4 ============================================================================== --- stable/10/share/man/man4/witness.4 Thu Jul 20 01:11:58 2017 (r321278) +++ stable/10/share/man/man4/witness.4 Thu Jul 20 01:12:31 2017 (r321279) @@ -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 @@ -55,6 +57,28 @@ code also checks various other conditions such as veri 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.
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