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SubjectRe: [PATCH 06/24] perf daemon: Add config file support
On Sun, Feb 7, 2021 at 7:35 AM Jiri Olsa <jolsa@redhat.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@redhat.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@kernel.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

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