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SubjectRe: [PATCH] ftrace: trigger: Call traceoff trigger after event recorded
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On Fri, 9 Sep 2016 01:05:45 +0900
Masami Hiramatsu <mhiramat@kernel.org> wrote:

> Call traceoff trigger after the event is recorded.
> Since current traceoff trigger is called before recording
> the event, we can not know when the trace is off by what event.
>
> Typical usecase of traceoff/traceon trigger is tracing
> function calls and trace events between a pair of events.
> For example, trace function calls between syscall entry/exit.
> In that case, it is useful if we can see the return code
> of the target syscall.
>
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
> ---
> kernel/trace/trace_events_trigger.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
> index a975571..6721a1e8 100644
> --- a/kernel/trace/trace_events_trigger.c
> +++ b/kernel/trace/trace_events_trigger.c
> @@ -1028,6 +1028,7 @@ static struct event_command trigger_traceon_cmd = {
> static struct event_command trigger_traceoff_cmd = {
> .name = "traceoff",
> .trigger_type = ETT_TRACE_ONOFF,
> + .flags = EVENT_CMD_FL_POST_TRIGGER,
> .func = event_trigger_callback,
> .reg = register_trigger,
> .unreg = unregister_trigger,
>


--
Masami Hiramatsu <mhiramat@kernel.org>

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