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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-03-17 22:32:31 +0100 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-03-27 21:39:01 +0100 |
| commit | 06e0a548bad0f43a21e036db018e4dadb501ce8b (patch) | |
| tree | 7587fb20e56bbb7fecf55fb4c9f0c6729b55f67d /Documentation | |
| parent | ring-buffer: Do not disable recording when there is an iterator (diff) | |
| download | linux-06e0a548bad0f43a21e036db018e4dadb501ce8b.tar.xz linux-06e0a548bad0f43a21e036db018e4dadb501ce8b.zip | |
tracing: Do not disable tracing when reading the trace file
When opening the "trace" file, it is no longer necessary to disable tracing.
Note, a new option is created called "pause-on-trace", when set, will cause
the trace file to emulate its original behavior.
Link: http://lkml.kernel.org/r/20200317213416.903351225@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/trace/ftrace.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst index 99a0890e20ec..c33950a35d65 100644 --- a/Documentation/trace/ftrace.rst +++ b/Documentation/trace/ftrace.rst @@ -1125,6 +1125,12 @@ Here are the available options: the trace displays additional information about the latency, as described in "Latency trace format". + pause-on-trace + When set, opening the trace file for read, will pause + writing to the ring buffer (as if tracing_on was set to zero). + This simulates the original behavior of the trace file. + When the file is closed, tracing will be enabled again. + record-cmd When any event or tracer is enabled, a hook is enabled in the sched_switch trace point to fill comm cache |