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From: Steven Rostedt <rostedt@goodmis.org>
To: Namhyung Kim <namhyung@kernel.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Tom Zanussi <tom.zanussi@linux.intel.com>,
	Clark Williams <williams@redhat.com>,
	Karim Yaghmour <karim.yaghmour@opersys.com>,
	Brendan Gregg <bgregg@netflix.com>,
	Joel Fernandes <joelaf@google.com>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	linux-rt-users@vger.kernel.org, kernel-team@lge.com
Subject: Re: [RFC][PATCH 06/10] tracing: Add trigger file for trace_markers tracefs/ftrace/print
Date: Wed, 16 May 2018 06:37:57 -0400	[thread overview]
Message-ID: <20180516063757.7d5a1ca5@gandalf.local.home> (raw)
In-Reply-To: <20180516074904.GA30309@danjae.aot.lge.com>

On Wed, 16 May 2018 16:49:04 +0900
Namhyung Kim <namhyung@kernel.org> wrote:


> > Which will do:
> > 
> >   event_trigger_write() {
> >     event_trigger_regex_write() {
> >       trigger_process_regex() {
> >         for p in trigger_commands {
> >           p->func(); /* trigger_snapshot_cmd->func */
> >             event_trigger_callback() {
> >               cmd_ops->reg() /* register_trigger() */ {
> >                 trace_event_trigger_enable_disable() {
> >                   trace_event_enable_disable() {
> >                     call->class->reg();
> > 
> > Without this patch, we jump to NULL and BOOM!  
> 
> Thanks for the explanation.  I wonder we can skip calling
> trace_event_enable_disable() for events which have the
> TRACE_EVENT_FL_IGNORE_ENABLE flag.

Sounds like something we can do in the future. I rather have do the
minimal now as it will have the least side effects, and it's already
getting late in the current rc series. I'm looking to get this into the
next merge window.

But after that, changing it this way would be a nice clean up.

-- Steve

  reply	other threads:[~2018-05-16 10:38 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11 19:49 [RFC][PATCH 00/10] tracing: Add triggers to trace_marker writes Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 01/10] tracing: Do not reference event data in post call triggers Steven Rostedt
2018-05-12 12:04   ` Masami Hiramatsu
2018-05-11 19:49 ` [RFC][PATCH 02/10] tracing: Add __find_event_file() to find event files without restrictions Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 03/10] tracing: Have event_trace_init() called by trace_init_tracefs() Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 04/10] tracing: Add brackets in ftrace event dynamic arrays Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 05/10] tracing: Do not show filter file for ftrace internal events Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 06/10] tracing: Add trigger file for trace_markers tracefs/ftrace/print Steven Rostedt
2018-05-14  3:13   ` Namhyung Kim
2018-05-14 15:04     ` Steven Rostedt
2018-05-16  7:49       ` Namhyung Kim
2018-05-16 10:37         ` Steven Rostedt [this message]
2018-05-11 19:49 ` [RFC][PATCH 07/10] tracing: Have zero size length in filter logic be full string Steven Rostedt
2018-05-12 12:40   ` Masami Hiramatsu
2018-05-12 17:27     ` Steven Rostedt
2018-05-12 18:32   ` Yann Ylavic
2018-05-14  2:23     ` Namhyung Kim
2018-05-14 14:12     ` Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 08/10] tracing: Prevent further users of zero size static arrays in trace events Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 09/10] tracing: Allow histogram triggers to access ftrace internal events Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 10/10] tracing: Document trace_marker triggers Steven Rostedt

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