linux-kernel - Re: [PATCH v2] perf: Synchronously cleanup child events

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Message-ID: <20160119200722.GD6357@twins.programming.kicks-ass.net>
Date:	Tue, 19 Jan 2016 21:07:22 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	vince@...ter.net, eranian@...gle.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH v2] perf: Synchronously cleanup child events

On Tue, Jan 19, 2016 at 05:12:34PM +0200, Alexander Shishkin wrote:
> +static bool put_event_last(struct perf_event *event)
>  {
> +	if (atomic_long_cmpxchg(&event->refcount, 1, 0)) {

	if (atomic_long_cmpxchg(&event->refcount, 1, 0) == 1) {

> +		__put_event(event);
> +		return true;
> +	}
> +
> +	return false;
>  }