Diff for /wikisrc/tutorials/how_to_enable_and_run_dtrace.mdwn between versions 1.5 and 1.21

version 1.5, 2014/04/03 11:55:12 version 1.21, 2017/10/13 04:38:31
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 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  # Current status
   
Line 7  DTrace is a Dynamic Tracing framework de Line 8  DTrace is a Dynamic Tracing framework de
 DTrace is a work-in-progress effort and it is for x86 systems and some arm boards.  DTrace is a work-in-progress effort and it is for x86 systems and some arm boards.
   
 * i386 and amd64  * i386 and amd64
 * evbarm  * earm* (evbarm and armv4 based ports)
     * BEAGLEBONE and SHEEVAPLUG  
   
 ## Supported providers  ## Supported providers
   
 * SDT: Statically Defined Tracing  * SDT: Statically Defined Tracing
 * FBT: Function Boundary Tracing  * FBT: Function Boundary Tracing
   * 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
   
 You can currently run a hello world DScript.   ## TODO for netbsd-7
   
   * Measure effect of `options KDTRACE_HOOKS` on system performance.
   * Determine whether the profile module works and list it here.
   * Integrate [[riz|users/riz]]'s syscall provider patch.
   
   ## TODO for netbsd-6
   
   Need to identify changes to pull up to netbsd-6 and pull them up.
   Candidates:
   
   * Profile provider.
   
 # How to use  # How to use
   
Line 23  You can currently run a hello world DScr Line 38  You can currently run a hello world DScr
   
 You need the following options in your kernel:   You need the following options in your kernel: 
           
     options         INSECURE      options         KDTRACE_HOOKS   # kernel DTrace hooks
     options         KDTRACE_HOOKS   # DTrace support  
     options         MODULAR      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:   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`
       
     modload solaris  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/`
     modload dtrace  
     modload sdt  
     modload fbt  
       
   
 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      solaris
     mknod /dev/dtrace/dtrace c dtrace 0      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   List the dtrace probes 
           
     dtrace -l      dtrace -l
Line 68  List the dtrace probes  Line 83  List the dtrace probes 
         .          .
     29140       proc                                                     lwp_start      29140       proc                                                     lwp_start
     29141       proc                                                     lwp_exit      29141       proc                                                     lwp_exit
       
   
     
   
   ##  Running hello world 
   
 Put the following into the file hello.d   Put the following into the file hello.d:
           
     BEGIN      BEGIN
     {      {
Line 91  Run the hello world script:  Line 105  Run the hello world script: 
       0      1                           :BEGIN   Hello world        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      #pragma D option flowindent
           
Line 102  A more complex example that traces the e Line 117  A more complex example that traces the e
             printf("fd: %d", arg0);              printf("fd: %d", arg0);
     }      }
           
     fbt:::      fbt::syscall:entry /self->traceme/ {}
     /self->traceme/  
     {}  
           
     fbt::syscall:return      fbt::syscall:return
     /self->traceme/      /self->traceme/
Line 114  A more complex example that traces the e Line 127  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. 
   
   ## Tools included base
   
   Starting with NetBSD-8, on builds where `MKDTRACE=yes` is set, scripts from
   [Brendan Gregg's DTrace toolkit](https://github.com/opendtrace/toolkit/) are installed in base as standard.
   
   At present, the following scripts are installed in `/usr/sbin`: 
   
       dtruss - An implementation of the truss utility in DTrace which traces the system calls
       made by a process
       execsnoop - snoop on execution of processes as they occur
       opensnoop - snoop on openning of files as they occur
       procsystime -  print process system call time details.

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  Added in v.1.21


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