linux-kernel - Re: [PATCH 1/2] perf: Add persistent event facilities

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Date:	Fri, 18 May 2012 17:24:56 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Borislav Petkov <bp@...64.org>, Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] perf: Add persistent event facilities

On Fri, May 18, 2012 at 04:37:37PM +0200, Peter Zijlstra wrote:
> > > I'm not seeing the relation to VM_SHARED here.
> > 
> > Well, in the sense that if mmap fails in the !VM_SHARED case, I can't
> > enable any persistent events except the ones which are enabled and so
> > I need to allocate another set of resources for that second persistent
> > events user.
> 
> Right, well, you could actually allow operations on the fd, just not a
> second mapping :-)
> 
> Anyway.. I'd push that error back to the user. If they need a second
> set, let them create it.
> 
> Do you really need multiple consumers for your MCE stuff? If so, what
> would be the problem of using VM_SHARED?

Nah, for MCE I'm fine with RO buffers, simple :-).

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