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

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Date:	Tue, 19 Jan 2016 08:45:34 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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] perf: Synchronously cleanup child events


* Alexander Shishkin <alexander.shishkin@...ux.intel.com> wrote:

> The orphan cleanup workqueue doesn't always catch orphans, for example, if they 
> never schedule after they are orphaned. IOW, the event leak is still very real. 
> It also wouldn't work for kernel counters.
> 
> Also, there seems to be no reason not to carry out this cleanup procedure 
> synchronously during parent event's destruction.

Absolutely, synchronous cleanup will probably also be quicker at triggering any 
remaining (and new ;-) races.

Thanks,

	Ingo