1TRACE-CMD-SNAPSHOT(1) libtracefs Manual TRACE-CMD-SNAPSHOT(1)
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6 trace-cmd-snapshot - take, reset, free, or show a Ftrace kernel
7 snapshot
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10 trace-cmd snapshot [OPTIONS]
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13 The trace-cmd(1) snapshot controls or displays the Ftrace Linux kernel
14 snapshot feature (if the kernel supports it). This is useful to
15 "freeze" an instance of a live trace but without stopping the trace.
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17 trace-cmd start -p function
18 trace-cmd snapshot -s
19 trace-cmd snapshot
20 [ dumps the content of buffer at 'trace-cmd snapshot -s' ]
21 trace-cmd snapshot -s
22 trace-cmd snapshot
23 [ dumps the new content of the buffer at the last -s operation ]
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26 -s
27 Take a snapshot of the currently running buffer.
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29 -r
30 Clear out the buffer.
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32 -f
33 Free the snapshot buffer. The buffer takes up memory inside the
34 kernel. It is best to free it when not in use. The first -s
35 operation will allocate it if it is not already allocated.
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37 -c cpu
38 Operate on a per cpu snapshot (may not be fully supported by all
39 kernels)
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41 -B buf
42 If a buffer instance was created, then the -B option will operate
43 on the snapshot within the buffer.
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46 trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1),
47 trace-cmd-start(1), trace-cmd-extract(1), trace-cmd-reset(1),
48 trace-cmd-split(1), trace-cmd-list(1), trace-cmd-listen(1)
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51 Written by Steven Rostedt, <rostedt@goodmis.org[1]>
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54 https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/
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57 Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted
58 under the terms of the GNU Public License (GPL).
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61 1. rostedt@goodmis.org
62 mailto:rostedt@goodmis.org
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66libtracefs 04/15/2022 TRACE-CMD-SNAPSHOT(1)