--- wikisrc/tutorials/how_to_enable_and_run_dtrace.mdwn	2014/08/23 00:33:07	1.6
+++ 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
 
@@ -7,22 +8,22 @@ 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
 
-* Rename provider modules to `dtrace_*.kmod`: `dtrace_fbt.kmod`, &c.
 * Measure effect of `options KDTRACE_HOOKS` on system performance.
 * Determine whether the profile module works and list it here.
-* Put a dtrace target in /dev/MAKEDEV.
+* Integrate [[riz|users/riz]]'s syscall provider patch.
 
 ## TODO for netbsd-6
 
@@ -30,7 +31,6 @@ Need to identify changes to pull up to n
 Candidates:
 
 * Profile provider.
-* Syscall provider.
 
 # How to use
 
@@ -38,29 +38,29 @@ Candidates:
 
 You need the following options in your kernel: 
     
-    options         INSECURE
-    options         KDTRACE_HOOKS   # DTrace support
+    options         KDTRACE_HOOKS   # kernel DTrace hooks
     options         MODULAR
-    
 
-You also need to build distribution with the options MKMODULAR=yes and MKDTRACE=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 sdt
-    modload 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`
+
+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/`
 
-Make the dtrace device node: 
+For example, add the following to `/etc/modules.conf` (the file may not exist already on a system):
     
-    mkdir /dev/dtrace
-    mknod /dev/dtrace/dtrace c dtrace 0
+    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
@@ -83,12 +83,11 @@ List the dtrace probes 
         .
     29140       proc                                                     lwp_start
     29141       proc                                                     lwp_exit
-    
 
-  
 
+##  Running hello world 
 
-Put the following into the file hello.d 
+Put the following into the file hello.d:
     
     BEGIN
     {
@@ -106,7 +105,8 @@ Run the hello world script: 
       0      1                           :BEGIN   Hello world
     
 
-A more complex example that traces the execution of a sleep operation in the kernel: 
+A more complex example that traces the execution of a sleep operation
+in the kernel. Put it in sleep.d:
     
     #pragma D option flowindent
     
@@ -117,9 +117,7 @@ A more complex example that traces the e
             printf("fd: %d", arg0);
     }
     
-    fbt:::
-    /self->traceme/
-    {}
+    fbt::syscall:entry /self->traceme/ {}
     
     fbt::syscall:return
     /self->traceme/
@@ -129,4 +127,4 @@ A more complex example that traces the e
     }
     
 
-Start the script running (dtrace -s <scriptname.d>) and then execute a sleep 2 in another shell. 
+Start the script running (dtrace -s sleep.d) and then execute a "sleep 2" in another shell.