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| author | Lecopzer Chen <lecopzer.chen@mediatek.com> | 2019-05-09 12:31:16 +0200 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2019-06-07 19:56:51 +0200 |
| commit | 78a89463a31ce463a4b968553f57ff9932a0697f (patch) | |
| tree | 2bd19f254013908911c754e1fa954f67a65a20cb /Documentation/trace/kprobetrace.rst | |
| parent | treewide: trivial: fix s/poped/popped/ typo (diff) | |
| download | linux-78a89463a31ce463a4b968553f57ff9932a0697f.tar.xz linux-78a89463a31ce463a4b968553f57ff9932a0697f.zip | |
Documentation: {u,k}probes: add tracing_on before tracing
After following the document step by step, the `cat trace` can't be
worked without enabling tracing_on and might mislead newbies about
the functionality.
Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/trace/kprobetrace.rst')
| -rw-r--r-- | Documentation/trace/kprobetrace.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/trace/kprobetrace.rst b/Documentation/trace/kprobetrace.rst index 235ce2ab131a..baa3c42ba2f4 100644 --- a/Documentation/trace/kprobetrace.rst +++ b/Documentation/trace/kprobetrace.rst @@ -189,6 +189,12 @@ events, you need to enable it. echo 1 > /sys/kernel/debug/tracing/events/kprobes/myprobe/enable echo 1 > /sys/kernel/debug/tracing/events/kprobes/myretprobe/enable +Use the following command to start tracing in an interval. +:: + # echo 1 > tracing_on + Open something... + # echo 0 > tracing_on + And you can see the traced information via /sys/kernel/debug/tracing/trace. :: |