Anonymous Enablings
To create an anonymous enabling, use the -A
option with a dtrace
invocation that specifies the desired probes, predicates, actions, and options. dtrace
adds a series of driver properties representing your request to the dtrace
driver's configuration file, typically /kernel/drv/dtrace.conf
. These properties will be read by the dtrace
driver when it is loaded. The driver will enable the specified probes with the specified actions, and create an anonymous state to associate with the new enabling. Normally, the dtrace
driver is loaded on-demand, similar to any drivers that act as DTrace providers. To allow tracing during boot, the dtrace
driver must be loaded as early as possible. dtrace
adds the necessary forceload
statements to /etc/system
for each required DTrace provider and for dtrace
itself.
Thereafter, when the system boots, a message is emitted by dtrace
to indicate that the configuration file has been successfully processed.
All options may be set with an anonymous enabling, including buffer size, dynamic variable size, speculation size, number of speculations, and so on.
To remove an anonymous enabling, use the dtrace -A
command without any probe descriptions.