linux-kernel - Re: [PATCH 06/24] perf daemon: Add config file support

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Message-ID: <CAM9d7cjmbrTiCjJjdfhBFCm8GhT-_fZE3DzWQLUMPj3a_6XJOw@mail.gmail.com>
Date:   Sun, 7 Feb 2021 10:38:31 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexei Budankov <abudankov@...wei.com>
Subject: Re: [PATCH 06/24] perf daemon: Add config file support

On Sun, Feb 7, 2021 at 7:35 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Sat, Feb 06, 2021 at 05:05:04PM +0900, Namhyung Kim wrote:
> > On Fri, Feb 5, 2021 at 9:56 PM Jiri Olsa <jolsa@...hat.com> wrote:
> > >
> > > On Fri, Feb 05, 2021 at 09:14:54PM +0900, Namhyung Kim wrote:
> > > > On Sun, Jan 31, 2021 at 8:49 AM Jiri Olsa <jolsa@...nel.org> wrote:
> > > > [SNIP]
> > > > > @@ -263,9 +605,16 @@ static int __cmd_start(struct daemon *daemon, struct option parent_options[],
> > > > >         signal(SIGTERM, sig_handler);
> > > > >
> > > > >         while (!done && !err) {
> > > > > -               if (fdarray__poll(&fda, -1)) {
> > > > > +               err = daemon__reconfig(daemon);
> > > >
> > > > I think it's confusing since you put the reconfig function here.
> > > > What not split normal and reconfig passes?
> > >
> > > hum, not sure what's confusing in here? I've been known to
> > > produce confusing code, but this one seems clear to me
> >
> > Maybe it's because of the name.  I thought reconfig is a
> > special case when it detects some change.  But you call
> > it in the loop unconditionally.
> >
> > >
> > > >
> > > > I mean something like below
> > > >
> > > >  __cmd_start()
> > > > {
> > > >     setup_server_config();
> > > >     daemon__run();
> > >
> > > what's daemon__run? the daemon operates in the while loop below
> >
> > I thought about starting the sessions in the config.
> >
> > >
> > > >
> > > >     while (!done && !err) {
> > > >         ...
> > > >         if (reconfig) {
> > > >             daemon__kill();
> > >
> > > you don't kill daemon for each reconfig change,
> > > we detect changed sessions and kill/restart only them
> >
> > Yep, we can make it that way.
> >
> > >
> > > >             setup_server_config();
> > > >             daemon__reconfig();
> > > >         }
> > > >     }
> > >
> > >
> > > so basically the current workflow is:
> > >
> > >         setup_server_config                                     <--- reads config file, prepares session objects
> > >
> > >         while (!done) {
> > >                 daemon__reconfig                                <--- check session objects states and run/stop them
> >
> > Hmm.. then how about rename it to daemon__handle_state()
> > or daemon__do_loop() or something?
>
> well it handles reconfig, so I don't think that there's
> better name than daemon__reconfig ;-)
>
> apart from handle_server_socket, all the other functions
> we call after poll can change session state, so we need
> to 'reconfig' sessions each time we do a loop

OK then.  Thanks for the explanation!

Thanks,
Namhyung