--- wikisrc/tutorials/how_to_enable_and_run_dtrace.mdwn	2015/11/28 19:23:12	1.13
+++ wikisrc/tutorials/how_to_enable_and_run_dtrace.mdwn	2017/04/08 21:38:18	1.18
@@ -1,4 +1,5 @@
-DTrace is a Dynamic Tracing framework developed by Sun and ported to NetBSD. It enables extensive instrumentation of the kernel and user space. See the [DTrace Community Page](http://dtrace.org) for more information. Also see [DTrace Introduction](http://dtrace.org/guide/preface.html). 
+DTrace is a Dynamic Tracing framework developed by Sun and ported to NetBSD. It enables extensive instrumentation of the kernel and user space. See the [DTrace Community Page](http://dtrace.org) for more information.
+Also see [DTrace Introduction](http://dtrace.org/guide/preface.html), Brendan Gregg's [DTrace one liners](http://www.brendangregg.com/DTrace/dtrace_oneliners.txt) and his notes for [DTrace on FreeBSD](https://wiki.freebsd.org/DTrace/).
 
 # Current status
 
@@ -7,15 +8,16 @@ DTrace is a Dynamic Tracing framework de
 DTrace is a work-in-progress effort and it is for x86 systems and some arm boards.
 
 * i386 and amd64
-* evbarm
-    * BEAGLEBONE and SHEEVAPLUG
+* earm* (evbarm and armv4 based ports)
 
 ## Supported providers
 
 * SDT: Statically Defined Tracing
 * FBT: Function Boundary Tracing
-
-You can currently run a hello world DScript. 
+* Lockstat: Kernel Lock Statistics
+* Profile: Time based interrupt event source for Profiling
+* Syscall: System Calls
+* Syscall Linux (32bit & 64 bit): System calls via the Linux binary emulation layer
 
 ## TODO for netbsd-7
 
@@ -36,29 +38,29 @@ Candidates:
 
 You need the following options in your kernel: 
     
-    options         INSECURE
     options         KDTRACE_HOOKS   # kernel DTrace hooks
     options         MODULAR
-    
 
-You also need to build distribution with the options `MKDTRACE=yes` and `MKCTF=yes`.
+Optionally:
 
-##  Running hello world 
+    options         INSECURE   # permit modules to loaded from user space once system has gone multiuser and securelevel has been raised.
 
-Load the solaris and dtrace modules, and the SDT (Statically Defined Tracing) and FBT (Function Boundary Tracing) modules: 
-    
-    modload solaris
-    modload dtrace
-    modload dtrace_sdt
-    modload dtrace_fbt
-    
+A Distribution needs to be built with the options `MKDTRACE=yes` and `MKCTF=yes`, this is taken care of automatically and doesn't need to be specified manually. The list of platforms it is applied to automatically is set in `src/share/mk/bsd.own.mk`
 
-Make the dtrace device node: 
+Set the system to load the solaris and dtrace related modules in `/etc/modules.conf`, for a list of available modules, see `/stand/$MACHINE/$VERSION/modules/`
+
+For example, add the following to `/etc/modules.conf` (the file may not exist already on a system):
     
-    cd /dev
-    sh MAKEDEV dtrace
+    solaris
+    dtrace
+    dtrace_sdt
+    dtrace_fbt
+    dtrace_lockstat
+    dtrace_profile
+    dtrace_syscall
+    
+A `dtrace` device node is created automatically in `/dev/dtrace` when the modules are loaded into place.
     
-
 List the dtrace probes 
     
     dtrace -l
@@ -81,10 +83,9 @@ List the dtrace probes 
         .
     29140       proc                                                     lwp_start
     29141       proc                                                     lwp_exit
-    
 
-  
 
+##  Running hello world 
 
 Put the following into the file hello.d: