You enable probes with the dtrace command by specifying
the probes without the
l option. Without further directions,
DTrace performs the default action when the specified probe fires. The default
probe action indicates only that the specified probe has fired and does not
record any other data. The following code example enables every probe in the sd module.
Example 2.6. Enabling Probes by Module
# dtrace -m sd
CPU ID FUNCTION:NAME
0 17329 sd_media_watch_cb:entry
0 17330 sd_media_watch_cb:return
0 17167 sdinfo:entry
0 17168 sdinfo:return
0 17151 sdstrategy:entry
0 17152 sdstrategy:return
0 17661 ddi_xbuf_qstrategy:entry
0 17662 ddi_xbuf_qstrategy:return
0 17649 xbuf_iostart:entry
0 17341 sd_xbuf_strategy:entry
0 17385 sd_xbuf_init:entry
0 17386 sd_xbuf_init:return
0 17342 sd_xbuf_strategy:return
0 17177 sd_mapblockaddr_iostart:entry
0 17178 sd_mapblockaddr_iostart:return
0 17179 sd_pm_iostart:entry
0 17365 sd_pm_entry:entry
0 17366 sd_pm_entry:return
0 17180 sd_pm_iostart:return
0 17181 sd_core_iostart:entry
0 17407 sd_add_buf_to_waitq:entry
...
The output in this example shows that the default action displays the CPU where the probe fired, the integer probe ID that is assigned by DTrace, the function where the probe fired, and the probe name.
Example 2.7. Enabling Probes by Provider
# dtrace -P syscall
dtrace: description 'syscall' matched 452 probes
CPU ID FUNCTION:NAME
0 99 ioctl:return
0 98 ioctl:entry
0 99 ioctl:return
0 98 ioctl:entry
0 99 ioctl:return
0 234 sysconfig:entry
0 235 sysconfig:return
0 234 sysconfig:entry
0 235 sysconfig:return
0 168 sigaction:entry
0 169 sigaction:return
0 168 sigaction:entry
0 169 sigaction:return
0 98 ioctl:entry
0 99 ioctl:return
0 234 sysconfig:entry
0 235 sysconfig:return
0 38 brk:entry
0 39 brk:return
...