I'm happy to announce that after over a year, we finally are able to
release trace-cmd version 2.9!
Features and user visible updates since 2.8:
- git hash is now visible in trace-cmd --version output
- Build: python-dir can be specified on the command line for python
location.
- Build: NO_UDIS86 on make command line to disable udisc86.
- Build: All headers needed by kernelshark installed.
- Added --proc-map to trace-cmd record.
Records the /proc/<pid>/maps of the traced file.
Used for seeing where page_faults happen (trace-cruncher can use it)
- Add --user to trace-cmd record, to allow to suid to another user to
execute the command also on the command line. Useful as trace-cmd needs
to be run as root to start the tracing, but when root should not be used
as the application being traced.
- Build: Install path of plugins have changed:
~/.traceevent/plugins/ --> ~/.local/lib/traceevent/plugins/
(install_prefix)/lib/trace-cmd/plugins --> (install_prefix)/lib/traceevent/plugins
- trace-cmd reset will now clear the tracing_cpumask file.
- ** NEW ** trace-cmd clear
Clear the trace file.
- ** NEW ** trace-cmd agent
Can be run on a guest, which will listen on a vsock for commands.
trace-cmd report -A Gust <options for guest>
Will connect to the guest agent and have the agent run tracing commands
sending the data back to the host. See man pages for more details.
(note, the synchronization of time stamps is not yet available,
that will be coming in the next release of trace-cmd).
- ** NEW ** trace-cmd setup-guest
Sets up fifos for a guest and host communications instead of vsocks.
- Add --cmdline_size option to trace-cmd record.
Changes the number of process names that are saved in the cache while
tracing.
- ** NEW ** trace-cmd dump
Dumps out raw data of the trace.dat file.
- Build: New: make test
Builds and runs various unit tests.
- More information from trace-cmd stat.
- trace-cmd reset will now clear the error log.
- Add option '-s' to trace-cmd list.
This will list the available systems (not events).
- Recording will now stop if -P is on the command line of trace-cmd record
and those processes all exit.
- trace-cmd start can now run commands.
This is useful when -F and -c are specified on the command line.
New "--fork" command line to have trace-cmd not wait for the command to
finish before exiting.
- ** New ** trace-cmd set command.
Used to set or unset options without messing with other ftrace options.
Plus many fixes and infrastructure improvements.
Changes are also made to set up having libtraceevent, libtracefs and
kernelshark be moved into their own git repositories.
We plan on working more more aggressively on the libraries and the tool
set, such that 3.0 wont take a year to be released.
For more information please visit: https://trace-cmd.org
If you would like to contribute, check out the above web site for where
we do our development, and feel free to contact us on how to get
involved.
Enjoy,
-- Steve
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