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TRACE-CMD-SNAPSHOT(1)
=====================
NAME
----
trace-cmd-snapshot - take, reset, free, or show a Ftrace kernel snapshot
SYNOPSIS
--------
*trace-cmd snapshot* ['OPTIONS']
DESCRIPTION
-----------
The trace-cmd(1) snapshot controls or displays the Ftrace Linux kernel
snapshot feature (if the kernel supports it). This is useful to "freeze"
an instance of a live trace but without stopping the trace.
trace-cmd start -p function
trace-cmd snapshot -s
trace-cmd snapshot
[ dumps the content of buffer at 'trace-cmd snapshot -s' ]
trace-cmd snapshot -s
trace-cmd snapshot
[ dumps the new content of the buffer at the last -s operation ]
OPTIONS
-------
*-s*::
Take a snapshot of the currently running buffer.
*-r*::
Clear out the buffer.
*-f*::
Free the snapshot buffer. The buffer takes up memory inside the
kernel. It is best to free it when not in use. The first -s
operation will allocate it if it is not already allocated.
*-c* 'cpu'::
Operate on a per cpu snapshot (may not be fully supported by all kernels)
*-B* 'buf'::
If a buffer instance was created, then the *-B* option will operate on
the snapshot within the buffer.
SEE ALSO
--------
trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1),
trace-cmd-extract(1), trace-cmd-reset(1), trace-cmd-split(1),
trace-cmd-list(1), trace-cmd-listen(1)
AUTHOR
------
Written by Steven Rostedt, <rostedt@goodmis.org>
RESOURCES
---------
https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/
COPYING
-------
Copyright \(C) 2010 Red Hat, Inc. Free use of this software is granted under
the terms of the GNU Public License (GPL).
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