diff options
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/events.rst | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/Documentation/trace/events.rst b/Documentation/trace/events.rst index 4a2ebe0bd19b..f792b1959a33 100644 --- a/Documentation/trace/events.rst +++ b/Documentation/trace/events.rst @@ -527,8 +527,8 @@ The following commands are supported: See Documentation/trace/histogram.rst for details and examples. -6.3 In-kernel trace event API ------------------------------ +7. In-kernel trace event API +============================ In most cases, the command-line interface to trace events is more than sufficient. Sometimes, however, applications might find the need for @@ -560,8 +560,8 @@ following: - tracing synthetic events from in-kernel code - the low-level "dynevent_cmd" API -6.3.1 Dyamically creating synthetic event definitions ------------------------------------------------------ +7.1 Dyamically creating synthetic event definitions +--------------------------------------------------- There are a couple ways to create a new synthetic event from a kernel module or other kernel code. @@ -666,8 +666,8 @@ registered by calling the synth_event_gen_cmd_end() function:: At this point, the event object is ready to be used for tracing new events. -6.3.3 Tracing synthetic events from in-kernel code --------------------------------------------------- +7.2 Tracing synthetic events from in-kernel code +------------------------------------------------ To trace a synthetic event, there are several options. The first option is to trace the event in one call, using synth_event_trace() @@ -678,8 +678,8 @@ synth_event_trace_start() and synth_event_trace_end() along with synth_event_add_next_val() or synth_event_add_val() to add the values piecewise. -6.3.3.1 Tracing a synthetic event all at once ---------------------------------------------- +7.2.1 Tracing a synthetic event all at once +------------------------------------------- To trace a synthetic event all at once, the synth_event_trace() or synth_event_trace_array() functions can be used. @@ -780,8 +780,8 @@ remove the event:: ret = synth_event_delete("schedtest"); -6.3.3.1 Tracing a synthetic event piecewise -------------------------------------------- +7.2.2 Tracing a synthetic event piecewise +----------------------------------------- To trace a synthetic using the piecewise method described above, the synth_event_trace_start() function is used to 'open' the synthetic @@ -864,8 +864,8 @@ Note that synth_event_trace_end() must be called at the end regardless of whether any of the add calls failed (say due to a bad field name being passed in). -6.3.4 Dyamically creating kprobe and kretprobe event definitions ----------------------------------------------------------------- +7.3 Dyamically creating kprobe and kretprobe event definitions +-------------------------------------------------------------- To create a kprobe or kretprobe trace event from kernel code, the kprobe_event_gen_cmd_start() or kretprobe_event_gen_cmd_start() @@ -941,8 +941,8 @@ used to give the kprobe event file back and delete the event:: ret = kprobe_event_delete("gen_kprobe_test"); -6.3.4 The "dynevent_cmd" low-level API --------------------------------------- +7.4 The "dynevent_cmd" low-level API +------------------------------------ Both the in-kernel synthetic event and kprobe interfaces are built on top of a lower-level "dynevent_cmd" interface. This interface is |