trace-cmd-snapshot.1

TRACE−CMD−SNAPSHOT

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
AUTHOR
RESOURCES
COPYING
NOTES

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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

mailto:rostedt@goodmis.org

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