TRACE-CMD-SNAPSHOT(1) libtracefs Manual 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[1]>
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).
NOTES
1. rostedt@goodmis.org
mailto:rostedt@goodmis.org
libtracefs 04/08/2024 TRACE-CMD-SNAPSHOT(1)
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