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

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Message-ID: <20120518142131.GO20215@aftab.osrc.amd.com>
Date:	Fri, 18 May 2012 16:21:31 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	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>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH 1/2] perf: Add persistent event facilities

On Fri, May 18, 2012 at 04:14:22PM +0200, Peter Zijlstra wrote:
> On Fri, 2012-05-18 at 16:09 +0200, Borislav Petkov wrote:
> > What happens here if a second user wants to enable a second set of
> > persistent events, allocate a second set of per-CPU buffers? 
> 
> 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.

-- 
Regards/Gruss,
Boris.

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