linux-kernel - Re: [PATCH v4 1/6] perf tools: Derive trigger class from auxtrace

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Message-ID: <20160418134544.GA13675@krava.brq.redhat.com>
Date:	Mon, 18 Apr 2016 15:45:44 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	acme@...nel.org, linux-kernel@...r.kernel.org, pi3orama@....com,
	Adrian Hunter <adrian.hunter@...el.com>,
	He Kuang <hekuang@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Zefan Li <lizefan@...wei.com>
Subject: Re: [PATCH v4 1/6] perf tools: Derive trigger class from
 auxtrace_snapshot

On Mon, Apr 18, 2016 at 06:32:08AM +0000, Wang Nan wrote:
> Use 'trigger' to model operations which need to be executed when
> an event (a signal, for example) is observed.
> 
> States and transits:
> 
>  OFF--(on)--> READY --(toggle)--> TOGGLED --(process)--> PROCESSING
>                 ^                    |                      |
>                 |                    |                      |
>                 |                 (ready)                (ready)
>                 |                    |                      |
>                  \__________________/______________________/
> 
> is_toggled and is_ready are two key functions to query the state of
> a trigger. is_toggled means the event already happen; is_ready means the
> trigger is waiting for the event.
> 
> 'PROCESSING' represents a state the event happens and be observed, and
> the processing is on the way so can't accept a new event immediately.

hum, I must be missing something.. but I dont see how you're
using this state except for smal window within:

                if (auxtrace_snapshot_is_toggled()) {
 ->                     auxtrace_snapshot_process();
                        if (!auxtrace_snapshot_is_error())
 ->                              record__read_auxtrace_snapshot(rec);

but no other place queries or depends on this state

also the switch_output code does not seem to use this transition at all

thanks,
jirka