From: Masami Hiramatsu Date: Thu, 8 Sep 2016 16:05:45 +0000 (+0900) Subject: tracing: Call traceoff trigger after event is recorded X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a0d0c6216afad4b2b1704a72bd76bea259e07655;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git tracing: Call traceoff trigger after event is recorded Call traceoff trigger after the event is recorded. Since current traceoff trigger is called before recording the event, we can not know what event stopped tracing. 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. Link: http://lkml.kernel.org/r/147335074530.12462.4526186083406015005.stgit@devbox Signed-off-by: Masami Hiramatsu Signed-off-by: Steven Rostedt --- diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c index a975571cde24..6721a1e89f39 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,