From 78a89463a31ce463a4b968553f57ff9932a0697f Mon Sep 17 00:00:00 2001 From: Lecopzer Chen Date: Thu, 9 May 2019 18:31:16 +0800 Subject: 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 Acked-by: Masami Hiramatsu Signed-off-by: Jonathan Corbet --- Documentation/trace/kprobetrace.rst | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'Documentation/trace/kprobetrace.rst') 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. :: -- cgit v1.2.3