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

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Message-ID: <20131031043346.GR4126@linux.vnet.ibm.com>
Date:	Wed, 30 Oct 2013 21:33:46 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Victor Kaplansky <VICTORK@...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 04:51:16PM +0100, Peter Zijlstra wrote:
> 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 :-)

Interesting that we didn't seem to supply a definition...  ;-)

							Thanx, Paul

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