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Oracle® Solaris 11.4 DTrace (Dynamic Tracing) Guide

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Updated: September 2020
 
 

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, specify –A with dtrace without any probe descriptions.