linux-kernel - Re: [PATCH 2/2] perf/tools: put new buildid locks to use

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Message-ID: <20150514104059.GA27771@gmail.com>
Date:	Thu, 14 May 2015 12:40:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Milos Vyletel <milos@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>, He Kuang <hekuang@...wei.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"open list:PERFORMANCE EVENT..." <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] perf/tools: put new buildid locks to use


* Milos Vyletel <milos@...hat.com> wrote:

> Use new read/write locks when accesing buildid directory on places where
> we may race if multiple instances are run simultaneously.

Dunno, this will create locking interaction between multiple instances 
of perf - hanging each other, etc.

And it seems unnecessary: the buildid hierarchy is already spread out. 
What kind of races might there be?

Thanks,

	Ingo
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