FreeBSD's DTrace needs specific settings?

M

martintangsl

I'm learning and evaluating DTrace.

DTrace on FreeBSD seems to be a bit different from other platforms.

# dtrace -n 'syscall:::'
gives the message
Code: 
dtrace: failed to initialize dtrace: DTrace device not available on system

Other platforms tested show a list of system calls.

Does DTrace need some specific settings on FreeBSD? My platform is FreeBSD 9.0 x86 running inside VirtualBox.
 
Thanks. Still some problems in using DTrace. Some probes does not work and running them several times would cause the virtual machine restarts.
sudo dtrace -n 'pid$target:a.out::entry' -c ./a.out gives
Code: 
dtrace: description 'pid$target:a.out::entry' matched 5 probes
dtrace: buffer size lowered to 6m
dtrace: pid 1150 has exited

I followed the wiki page here, created and wrote /etc/make.conf, compiled and installed the world. Still restarting.
 
After FreeBSD9 installation, I got the same error too. Then I did "kldload dtrace" and "kldload dtraceall" and surprisingly, no error, which means that default it is not loaded. These kernel modules are residing in /boot/kernel - so go there and make sure it exists. If yes, then just kldload the module, and it should work.
 
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