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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2013-04-30 21:46:14 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-06-12 00:38:46 +0200 |
| commit | ad71d889b88055e61e3970a6744a271a51a94f42 (patch) | |
| tree | 716f6e043847000a82449270e3b2d5dcdc9c4f79 /Documentation/trace/ftrace.txt | |
| parent | Linux 3.10-rc5 (diff) | |
| download | linux-ad71d889b88055e61e3970a6744a271a51a94f42.tar.xz linux-ad71d889b88055e61e3970a6744a271a51a94f42.zip | |
tracing: Add function probe to trigger a ftrace dump to console
Add the "dump" command to have the ftrace buffer dumped to console if
a function is hit. This is useful when debugging a tripple fault,
where you have an idea of a function that is called just before the
tripple fault occurs, and can tell ftrace to dump its content out
to the console before it continues.
Format is:
<function>:dump
echo 'bad_address:dump' > /debug/tracing/set_ftrace_filter
To remove this:
echo '!bad_address:dump' > /debug/tracing/set_ftrace_filter
Requested-by: Luis Claudio R. Goncalves <lclaudio@uudg.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/trace/ftrace.txt')
| -rw-r--r-- | Documentation/trace/ftrace.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt index bfe8c29b1f1d..cc9ec57e157c 100644 --- a/Documentation/trace/ftrace.txt +++ b/Documentation/trace/ftrace.txt @@ -2430,6 +2430,13 @@ The following commands are supported: echo '!schedule:disable_event:sched:sched_switch' > \ set_ftrace_filter +- dump + When the function is hit, it will dump the contents of the ftrace + ring buffer to the console. This is useful if you need to debug + something, and want to dump the trace when a certain function + is hit. Perhaps its a function that is called before a tripple + fault happens and does not allow you to get a regular dump. + trace_pipe ---------- |