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docs: fix wrong usage of proftool

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The usage of proftool in docs is incorrect. If proftool is used without
'-o' argument, it will show the usage like following

$ ./sandbox/tools/proftool -m sandbox/System.map -t trace -f funcgraph dump-ftrace >trace.dat
Must provide trace data, System.map file and output file
Usage: proftool [-cmtv] <cmd> <profdata>

Change '>' to '-o' to fix it.

Signed-off-by: Puhan Zhou <puh4n.zhou@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Puhan Zhou 2023-08-13 13:16:19 +08:00 committed by Heinrich Schuchardt
parent 4ad85a9fea
commit aab60a5128
1 changed files with 3 additions and 3 deletions
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6
doc/develop/trace.rst
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@ -139,7 +139,7 @@ There is a -f option available to select a function graph:
.. code-block:: console .. code-block:: console
$ ./sandbox/tools/proftool -m sandbox/System.map -t trace -f funcgraph dump-ftrace >trace.dat $ ./sandbox/tools/proftool -m sandbox/System.map -t trace -f funcgraph dump-ftrace -o trace.dat
Again, you can use kernelshark or trace-cmd to look at the output. In this case Again, you can use kernelshark or trace-cmd to look at the output. In this case
you will see the time taken by each function shown against its exit record. you will see the time taken by each function shown against its exit record.
@ -171,7 +171,7 @@ command:
.. code-block:: console .. code-block:: console
$ ./sandbox/tools/proftool -m sandbox/System.map -t trace dump-flamegraph >trace.fg $ ./sandbox/tools/proftool -m sandbox/System.map -t trace dump-flamegraph -o trace.fg
$ flamegraph.pl trace.fg >trace.svg $ flamegraph.pl trace.fg >trace.svg
You can load the .svg file into a viewer. If you use Chrome (and some other You can load the .svg file into a viewer. If you use Chrome (and some other
@ -191,7 +191,7 @@ spend in each call stack:
.. code-block:: console .. code-block:: console
$ ./sandbox/tools/proftool -m sandbox/System.map -t trace dump-flamegraph -f timing >trace.fg $ ./sandbox/tools/proftool -m sandbox/System.map -t trace dump-flamegraph -f timing -o trace.fg
$ flamegraph.pl trace.fg >trace.svg $ flamegraph.pl trace.fg >trace.svg
Note that trace collection does slow down execution so the timings will be Note that trace collection does slow down execution so the timings will be