tplist

tplist [-p PID] [-l LIB] [-v] [filter]

tplist lists all kernel tracepoints, and can optionally print out the tracepoint format; namely, the variables that you can trace when the tracepoint is hit. tplist can also list USDT probes embedded in a specific library or executable, and can list USDT probes for all the libraries loaded by a specific process. These features are usually used in conjunction with the argdist and/or trace tools.

On a typical system, accessing the tracepoint list and format requires root. However, accessing USDT probes does not require root.

-p PID

Display the USDT probes from all the libraries loaded by the specified process.

-l LIB

Display the USDT probes from the specified library or executable. If the librar or executable can be found in the standard paths, a full path is not required.

-v

Increase the verbosity level. Can be used to display the variables, locations, and arguments of tracepoints and USDT probes.

[filter]

A wildcard expression that specifies which tracepoints or probes to print. For example, block:* will print all block tracepoints (block:block_rq_complete, etc.). Regular expressions are not supported.

Print all kernel tracepoints:

# tplist

Print all net tracepoints with their format:

# tplist -v 'net:*'

Print all USDT probes in libpthread:

$ tplist -l pthread

Print all USDT probes in process 4717 from the libc provider:

$ tplist -p 4717 'libc:*'

Print all the USDT probes in the node executable:

$ tplist -l node

This is from bcc.

https://github.com/iovisor/bcc

Linux

Unstable - in development.

Sasha Goldshtein