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| author | Puhan Zhou <puh4n.zhou@gmail.com> | 2023-08-13 13:16:19 +0800 |
|---|---|---|
| committer | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2023-08-19 04:12:52 +0200 |
| commit | aab60a51284bce8f21e472d3e8943f76586edf42 (patch) | |
| tree | 9767f7da0af165472490e2639479e3db194447a5 | |
| parent | 4ad85a9fea1ad5c401272102e68398f3bbdd20dd (diff) | |
| download | u-boot-aab60a51284bce8f21e472d3e8943f76586edf42.tar.gz u-boot-aab60a51284bce8f21e472d3e8943f76586edf42.tar.bz2 u-boot-aab60a51284bce8f21e472d3e8943f76586edf42.zip | |
docs: fix wrong usage of proftool
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>
| -rw-r--r-- | doc/develop/trace.rst | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/doc/develop/trace.rst b/doc/develop/trace.rst index 9bbe1345d2..546862020b 100644 --- a/doc/develop/trace.rst +++ b/doc/develop/trace.rst @@ -139,7 +139,7 @@ There is a -f option available to select a function graph: .. 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 you will see the time taken by each function shown against its exit record. @@ -171,7 +171,7 @@ command: .. 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 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 - $ ./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 Note that trace collection does slow down execution so the timings will be |