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TRACE-CMD(1) libtracefs Manual TRACE-CMD(1)


trace-cmd - interacts with Ftrace Linux kernel internal tracer




The trace-cmd(1) command interacts with the Ftrace tracer that is built inside the Linux kernel. It interfaces with the Ftrace specific files found in the debugfs file system under the tracing directory. A COMMAND must be specified to tell trace-cmd what to do.


record  - record a live trace and write a trace.dat file to the

local disk or to the network.

set     - set a ftrace configuration parameter.

report  - reads a trace.dat file and converts the binary data to a

ASCII text readable format.

stream  - Start tracing and read the output directly

profile - Start profiling and read the output directly

hist    - show a histogram of the events.

stat    - show tracing (ftrace) status of the running system

options - list the plugin options that are available to *report*

start   - start the tracing without recording to a trace.dat file.

stop    - stop tracing (only disables recording, overhead of tracer

is still in effect)

restart - restart tracing from a previous stop (only effects recording)

extract - extract the data from the kernel buffer and create a trace.dat


show    - display the contents of one of the Ftrace Linux kernel tracing files

reset   - disables all tracing and gives back the system performance.

(clears all data from the kernel buffers)

clear   - clear the content of the Ftrace ring buffers.

split   - splits a trace.dat file into smaller files.

list    - list the available plugins or events that can be recorded.

listen  - open up a port to listen for remote tracing connections.

agent   - listen on a vsocket for trace clients

setup-guest - create FIFOs for tracing guest VMs

restore - restore the data files of a crashed run of trace-cmd record

snapshot- take snapshot of running trace

stack   - run and display the stack tracer

check-events - parse format strings for all trace events and return

whether all formats are parseable

convert   - convert trace files

attach   - attach a host trace.dat file to a guest trace.dat file

dump    - read out the meta data from a trace file


-h, --help

Display the help text.

Other options see the man page for the corresponding command.


trace-cmd-record(1), trace-cmd-report(1), trace-cmd-hist(1), trace-cmd-start(1), trace-cmd-stop(1), trace-cmd-extract(1), trace-cmd-reset(1), trace-cmd-restore(1), trace-cmd-stack(1), trace-cmd-convert(1), trace-cmd-split(1), trace-cmd-list(1), trace-cmd-listen(1), trace-cmd.dat(5), trace-cmd-check-events(1), trace-cmd-stat(1), trace-cmd-attach(1)


Written by Steven Rostedt, <[1]>



Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).


02/10/2024 libtracefs