linux-kernel - Re: perf events ring buffer memory barrier on powerpc

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Message-ID: <20131030155116.GO16117@laptop.programming.kicks-ass.net>
Date:	Wed, 30 Oct 2013 16:51:16 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Victor Kaplansky <VICTORK@...ibm.com>
Cc:	paulmck@...ux.vnet.ibm.com, Anton Blanchard <anton@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PPC dev <linuxppc-dev@...abs.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Michael Ellerman <michael@...erman.id.au>,
	Michael Neuling <mikey@...ling.org>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: perf events ring buffer memory barrier on powerpc

On Wed, Oct 30, 2013 at 03:28:54PM +0200, Victor Kaplansky wrote:
> one of the authors of Documentation/memory-barriers.txt is on cc: list ;-)
> 
> Disclaimer: it is anyway impossible to prove lack of *any* problem.
> 
> Having said that, lets look into an example in
> Documentation/circular-buffers.txt:

> 
> We can see that authors of the document didn't put any memory barrier

Note that both documents have the same author list ;-)

Anyway, I didn't know about the circular thing, I suppose I should use
CIRC_SPACE() thing :-)
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