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

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Message-ID: <20120518100147.GC20215@aftab.osrc.amd.com>
Date:	Fri, 18 May 2012 12:01:47 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Borislav Petkov <bp@...64.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 11:58:58AM +0200, Peter Zijlstra wrote:
> On Wed, 2012-03-21 at 15:34 +0100, Borislav Petkov wrote:
> > Add a barebones implementation for registering persistent events with
> > perf. For that, we don't destroy the buffers when they're unmapped;
> > also, we map them read-only so that multiple agents can access them.
> 
> Yet you don't fail mmap() for VM_WRITE && ->persistent.

I better go fix that after we've agreed on the overall design.

Thanks Peter.

-- 
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Boris.

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