The trace-cmd(1) stat displays the various status of the tracing
(ftrace) system. The status that it shows is:
Instances: List all configured ftrace instances.
Tracer: if one of the tracers (like function_graph) is active.
Otherwise nothing is displayed.
Events: Lists the events that are enable.
Event filters: Shows any filters that are set for any events
Function filters: Shows any filters for the function tracers
Graph functions: Shows any functions that the function graph
tracer should graph
Buffers: Shows the trace buffer size if they have been expanded.
By default, tracing buffers are in a compressed format until they
are used. If they are compressed, the buffer display will not be
Trace clock: If the tracing clock is anything other than the
default "local" it will be displayed.
Trace CPU mask: If not all available CPUs are in the tracing CPU
mask, then the tracing CPU mask will be displayed.
Trace max latency: Shows the value of the trace max latency if it
is other than zero.
Kprobes: Shows any kprobes that are defined for tracing.
Uprobes: Shows any uprobes that are defined for tracing.
Error log: Dump the content of ftrace error_log file.
This page is part of the trace-cmd (a front-end for Ftrace)
project. Information about the project can be found at [unknown
-- if you know, please contact email@example.com] If you have a
bug report for this manual page, send it to Steven Rostedt
<firstname.lastname@example.org>. This page was obtained from the project's
upstream Git repository
on 2021-08-27. (At that time, the date of the most recent commit
that was found in the repository was 2021-08-20.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
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