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

       git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/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

                                            01/29/2014                      TRACE-CMD-SNAPSHOT(1)