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Chapter 13 Statically Defined Tracing of User Applications
https://docs.oracle.com/en/operating-systems/oracle-linux/dtrace-guide/dt_sdt.html
Chapter 13 Statically Defined Tracing of User Applications DTrace provides a facility for user application developers to define customized probes in application code to augment the capabilities of the pid provider. These static probes impose little to no overhead when disabled and are dynamically enabled like all other DTrace probes.
GitHub - atheriel/usdt: User-level Statically Defined ...
https://github.com/atheriel/usdt
usdt usdt brings User-level Statically Defined Tracing (USDT) to R, allowing users to create low-ovehead probes that can be enabled at runtime with external tracing tools such as BPF on Linux and Dtrace on macOS and Solaris. USDT was first popularized by Dtrace on Solaris (and later Illumos, the BSDs, and macOS).
Statically Defined Tracing for User Applications - Dynamic ...
https://illumos.org/books/dtrace/chp-usdt.html
Statically Defined Tracing for User Applications DTrace provides a facility for user application developers to define customized probes in application code to augment the capabilities of the pid provider. These static probes impose little to no overhead when disabled and are dynamically enabled like all other DTrace probes.
User Statically-Defined Tracing (USDT) probes — Open ...
https://docs.openvswitch.org/en/latest/topics/usdt-probes/
User Statically-Defined Tracing (USDT) probes¶ Sometimes it’s desired to troubleshoot one of OVS’s components in the field. One of the techniques used is to add dynamic tracepoints, for example using perf. However, the desired dynamic tracepoint and/or the desired variable, might not be available due to compiler optimizations.
Chapter 34 Statically Defined Tracing for User ... - Oracle
https://docs.oracle.com/cd/E19253-01/817-6223/chp-usdt/index.html
Hacking Linux USDT with Ftrace - Brendan Gregg
http://www.brendangregg.com/blog/2015-07-03/hacking-linux-usdt-ftrace.html
User-level Statically Defined Tracing A USDT probe (or user-level "marker") is where the developer has added tracing macros to their code at interesting locations, with a stable and documented API. It makes tracing easier. (If you are a developer, see Adding User Space Probing for an example of how to add these.)
trace - Is there any ways to support usdt probes(User ...
https://stackoverflow.com/questions/55988484/is-there-any-ways-to-support-usdt-probesuser-level-statically-defined-tracing
These tracepoints can be defined in any executable or shared library as well as the kernel. For example: ./perf probe -x /path/to/exectuable function_name They are then available as tracepoints for perfand friends. You can also add function parameters or local variables if the optimization level permits. Share Improve this answer Follow
An eBPF overview, part 5: Tracing user processes
https://www.collabora.com/news-and-blog/blog/2019/05/14/an-ebpf-overview-part-5-tracing-user-processes/
Static tracepoints, also known in userspace as USDT (User Statically Defined Trace) probes, are specific locations of interest in an application where tracers can be hooked to inspect code execution and data. They are explicitly defined by developers in source code and usually enabled at compile time with flags like "--enable-dtrace".
BPFTrace & Julia: An introduction to UProbes
https://vchuravy.dev/notes/2021/08/bpftrace/
*USDT = user-level statically defined tracing I will focus on userland for now, since that is the most useful feature for understanding applications, like Julia. The difference between static and dynamic comes down to whether the application is compiled with explicit tracepoints, which are static, or whether we are dynamically instrumenting functions in the application.
Linux perf Examples
https://www.brendangregg.com/perf.html
User-Level Statically Defined Tracing (USDT) Similar to kernel tracepoints, these are hardcoded (usually by placing macros) in the application source at logical and interesting locations, and presented (event name and arguments) as a stable API.
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