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| author | Tom Zanussi <tom.zanussi@linux.intel.com> | 2014-01-18 01:11:44 +0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-01-23 08:06:57 +0400 |
| commit | 26f255646e0ca6fde0e994e2a815ba2b31770dce (patch) | |
| tree | 743a8970a2efd0e8915b8318e44ccae7d458be88 /kernel/trace | |
| parent | 92fdd98cf8bdec4d6b0c510e2f073ac4fd059be8 (diff) | |
| download | linux-26f255646e0ca6fde0e994e2a815ba2b31770dce.tar.xz | |
tracing/README: Add event file usage to tracing mini-HOWTO
It would be useful to have a cheat-sheet for everything under
tracing/events/ alongside the existing text describing the other files
in the tracing/ dir.
Add short descriptions of the directories and files under events/
along with examples, similar to the existing text for the other files
in tracing/.
Also clean up a few minor alignment problems noticed when adding the
new text.
Link: http://lkml.kernel.org/r/1389993104.3040.445.camel@empanada
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace.c | 37 |
1 files changed, 34 insertions, 3 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 20c755e018ca..2ced5e5931b9 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3523,9 +3523,9 @@ static const char readme_msg[] = #ifdef CONFIG_DYNAMIC_FTRACE "\n available_filter_functions - list of functions that can be filtered on\n" " set_ftrace_filter\t- echo function name in here to only trace these functions\n" - " accepts: func_full_name, *func_end, func_begin*, *func_middle*\n" - " modules: Can select a group via module\n" - " Format: :mod:<module-name>\n" + " accepts: func_full_name, *func_end, func_begin*, *func_middle*\n" + " modules: Can select a group via module\n" + " Format: :mod:<module-name>\n" " example: echo :mod:ext3 > set_ftrace_filter\n" " triggers: a command to perform when function is hit\n" " Format: <function>:<trigger>[:count]\n" @@ -3573,6 +3573,37 @@ static const char readme_msg[] = " stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace traces\n" #endif #endif /* CONFIG_STACK_TRACER */ + " events/\t\t- Directory containing all trace event subsystems:\n" + " enable\t\t- Write 0/1 to enable/disable tracing of all events\n" + " events/<system>/\t- Directory containing all trace events for <system>:\n" + " enable\t\t- Write 0/1 to enable/disable tracing of all <system> events\n" + " filter\t\t- If set, only events passing filter are traced\n" + " events/<system>/<event>/\t- Directory containing control files for <event>:\n" + " enable\t\t- Write 0/1 to enable/disable tracing of <event>\n" + " filter\t\t- If set, only events passing filter are traced\n" + " trigger\t\t- If set, a command to perform when event is hit\n" + " Format: <trigger>[:count][if <filter>]\n" + " trigger: traceon, traceoff\n" + " enable_event:<system>:<event>\n" + " disable_event:<system>:<event>\n" +#ifdef CONFIG_STACKTRACE + " stacktrace\n" +#endif +#ifdef CONFIG_TRACER_SNAPSHOT + " snapshot\n" +#endif + " example: echo traceoff > events/block/block_unplug/trigger\n" + " echo traceoff:3 > events/block/block_unplug/trigger\n" + " echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > events/block/block_unplug/trigger\n" + " The first disables tracing every time block_unplug is hit.\n" + " The second disables tracing the first 3 times block_unplug is hit.\n" + " The third enables the kmalloc event the first 3 times block_unplug\n" + " is hit and has value of greater than 1 for the 'nr_rq' event field.\n" + " To remove a trigger without a count:\n" + " echo '!<trigger> > <system>/<event>/trigger\n" + " To remove a trigger with a count:\n" + " echo '!<trigger>:0 > <system>/<event>/trigger\n" + " Filters can be ignored when removing a trigger.\n" ; static ssize_t |