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

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Message-ID: <YBwOAvk0v2o2w5j9@krava>
Date:   Thu, 4 Feb 2021 16:08:50 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...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>,
        Namhyung Kim <namhyung@...nel.org>,
        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 Wed, Feb 03, 2021 at 06:12:11PM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> > -static struct daemon __daemon = { };
> > +static struct daemon __daemon = {
> > +	.sessions = LIST_HEAD_INIT(__daemon.sessions),
> > +};
> >  
> >  static const char * const daemon_usage[] = {
> >  	"perf daemon start [<options>]",
> > @@ -43,6 +97,128 @@ static void sig_handler(int sig __maybe_unused)
> >  	done = true;
> >  }
> >  
> > +static struct session*
> > +daemon__add_session(struct daemon *config, char *name)
> > +{
> > +	struct session *session;
> > +
> > +	session = zalloc(sizeof(*session));
> 
> 	
> 	struct session *session = zalloc(sizeof(*session));
> 
> > +	if (!session)
> > +		return NULL;
> > +
> > +	session->name = strdup(name);
> > +	if (!session->name) {
> > +		free(session);
> > +		return NULL;
> > +	}
> > +
> > +	session->pid = -1;
> > +	list_add_tail(&session->list, &config->sessions);
> > +	return session;
> > +}
> > +
> > +static struct session*
> 
> add space after type name
> 
>    static struct session *
> 
> And we could have it in the same line:
> 
>   static struct session *daemon__find_session(struct daemon *daemon, char *name)

ok

SNIP

> > +			/*
> > +			 * Either new or changed run value is defined,
> > +			 * trigger reconfig for the session.
> > +			 */
> > +			session->state = SESSION_STATE__RECONFIG;
> > +		}
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int server_config(const char *var, const char *value, void *cb)
> > +{
> > +	struct daemon *daemon = cb;
> > +
> > +	if (strstarts(var, "session-"))
> > +		return session_config(daemon, var, value);
> > +	else if (!strcmp(var, "daemon.base") && !daemon->base_user) {
> 
> if else uses {}, if should too

ok

SNIP

> > +
> > +static void session__free(struct session *session)
> > +{
> > +	free(session->base);
> > +	free(session->name);
> > +	free(session->run);
> 
> zfree() so that if there is some dangling pointer to session, we'll get
> NULL derefs

and won't be notified by crash about the error ;-) ok

> 
> > +	free(session);
> > +}
> > +
> > +static void session__remove(struct session *session)
> > +{
> > +	list_del(&session->list);
> 
> list_del_init
> 
> > +	session__free(session);
> > +}
> > +
> > +static void daemon__kill(struct daemon *daemon)
> > +{
> > +	daemon__signal(daemon, SIGTERM);
> > +}
> > +
> >  static void daemon__free(struct daemon *daemon)
> >  {
> > +	struct session *session, *h;
> > +
> > +	list_for_each_entry_safe(session, h, &daemon->sessions, list)
> > +		session__remove(session);
> 
> Wouldn't be better to have:
> 
> 	 list_for_each_entry_safe(session, h, &daemon->sessions, list) {
> 	 	list_del_init(&session->list);
> 		session__free(session);
> 	 }
> 
> Because naming that function "session__remove()" one thinks it is being
> removed from some data structure, but not that it is being as well
> deleted.
> 
> Please rename session__free() to session__delete() to keep it consistent
> with other places.

ok

> 
> > +
> >  	free(daemon->config_real);
> >  	free(daemon->base);
> >  }
> >  
> >  static void daemon__exit(struct daemon *daemon)
> >  {
> > +	daemon__kill(daemon);
> >  	daemon__free(daemon);
> 
> Ditto for daemon__free(): please rename it to daemon__delete()

ok

thanks,
jirka