[src/trunk]: src/share/man/man4 mention KDTRACE_HOOKS.

[chs <chs%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/1d2938c33158
branches:  trunk
changeset: 351983:1d2938c33158
user:      chs <chs%NetBSD.org@localhost>
date:      Thu Mar 09 00:17:32 2017 +0000

description:
mention KDTRACE_HOOKS.

diffstat:

 share/man/man4/options.4 |  8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diffs (22 lines):

diff -r 4b9d07e18f90 -r 1d2938c33158 share/man/man4/options.4
--- a/share/man/man4/options.4  Thu Mar 09 00:16:51 2017 +0000
+++ b/share/man/man4/options.4  Thu Mar 09 00:17:32 2017 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: options.4,v 1.463 2017/02/19 11:16:45 wiz Exp $
+.\"    $NetBSD: options.4,v 1.464 2017/03/09 00:17:32 chs Exp $
 .\"
 .\" Copyright (c) 1996
 .\"    Perry E. Metzger.  All rights reserved.
@@ -634,6 +634,12 @@
 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 KDTRACE_HOOKS
+Adds hooks for the DTrace tracing facility, which allows users to
+analyse many aspects of system and application behavior.
+See
+.Xr dtrace 1
+for details.
 .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