linux-kernel - Re: [PATCH 5/5] perf tools: Share process map groups within process threads

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Message-ID: <871ty1thgk.fsf@sejong.aot.lge.com>
Date:	Mon, 17 Mar 2014 16:25:15 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Don Zickus <dzickus@...hat.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH 5/5] perf tools: Share process map groups within process threads

On Fri, 14 Mar 2014 15:00:06 +0100, Jiri Olsa wrote:
> +	if (!mg) {
> +		struct thread *leader = thread__get_leader(thread);
> +
> +		if (!leader)
> +			return NULL;
> +
> +		if (leader->mg)
> +			mg = leader->mg;
> +		else
> +			mg = thread__map_groups_alloc(leader);
> +
> +		if (leader != thread)
> +			thread->mg = mg;
> +
> +		mg->refcnt++;

What's the value of mg->refcnt here in case of leader != thread and
leader->mg was not allocated originally?  I think it's 1 - but shouldn't
it be 2 since it's referenced from both of leader and the thread now?

Thanks,
Namhyung
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