linux-kernel - Re: [RFC][PATCH 00/21] tracing: Inter-event (e.g. latency) support

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Message-ID: <20170209145729.7b176e98@gandalf.local.home>
Date:   Thu, 9 Feb 2017 14:57:29 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>, tglx@...utronix.de,
        namhyung@...nel.org, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org
Subject: Re: [RFC][PATCH 00/21] tracing: Inter-event (e.g. latency) support

On Thu, 09 Feb 2017 11:18:32 -0600
Tom Zanussi <tom.zanussi@...ux.intel.com> wrote:

> I think it might make a lot of sense at this point to actually create a
> system-wide list of active triggers e.g. tracing/events/triggers or
> something like that.  It's something I've kind of wanted anyway, and
> would be really useful if not indispensable for this.  Actually, I
> thought it might even be nice to have some kind of mini-fs or something
> making it easy to group sets of related triggers and enable and
> disable/remove them as a group, but a simple list would suffice too...

Note, (new) trace-cmd does this for you (by querying all trigger files).

# echo 'stacktrace if COMM ~ "system*"' > /debug/tracing/events/syscalls/sys_enter_open/trigger
# trace-cmd stat

Events:
  (none enabled)

Triggers:
  syscalls:sys_enter_open "stacktrace:unlimited if COMM ~ "system*""

Tracing is enabled



-- Steve