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Oracle Solaris 11.1 Dynamic Tracing Guide     Oracle Solaris 11.1 Information Library
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Document Information

Preface

1.  About DTrace

2.  D Programming Language

3.  Aggregations

4.  Actions and Subroutines

5.  Buffers and Buffering

6.  Output Formatting

7.  Speculative Tracing

8.  dtrace(1M) Utility

9.  Scripting

10.  Options and Tunables

11.  Providers

12.  User Process Tracing

13.  Statically Defined Tracing for User Applications

14.  Security

Privileges

Privileged Use of DTrace

dtrace_proc Privilege

dtrace_user Privilege

dtrace_kernel Privilege

Super User Privileges

15.  Anonymous Tracing

16.  Postmortem Tracing

17.  Performance Considerations

18.  Stability

19.  Translators

20.  Versioning

Index

dtrace_user Privilege

The dtrace_user privilege permits use of the profile and syscall providers with some caveats, and the use of the following actions and variables:

Providers
profile
syscall
fasttrap
Actions
copyin
copyout
stop
copyinstr
raise
ustack
Variables
execname
pid
uregs
Address Spaces
User

The dtrace_user privilege provides only visibility to those processes to which the user already has permission; it does not allow any visibility into kernel state or activity. With this privilege, users may enable the syscall provider, but the enabled probes will only activate in processes to which the user has permission. Similarly, the profile provider may be enabled, but the enabled probes will only activate in processes to which the user has permission, never in the Oracle Solaris kernel.

This privilege permits the use of instrumentation that, while only allowing visibility into particular processes, can affect overall system performance. The syscall provider has some small performance impact on every system call for every process. The profile provider affects overall system performance by executing every time interval, similar to a real-time timer. Neither of these performance degradations is so great as to severely limit the system's progress, but system administrators should consider the implications of granting a user this privilege. Refer to syscall Provider and profile Provider for a discussion of the performance impact of the syscall and profile providers.