linux-kernel - Re: [RFC PATCH] perf: align raw sample data on 64-bit boundaries

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Message-ID: <20100528173555.GP21799@erda.amd.com>
Date:	Fri, 28 May 2010 19:35:55 +0200
From:	Robert Richter <robert.richter@....com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] perf: align raw sample data on 64-bit boundaries

On 24.05.10 17:25:01, Frederic Weisbecker wrote:
> It doesn't duplicate much code paths, we only have a few corner cases to
> plug in. And more importantly, that would be temporary if we schedule the
> older PERF_SAMPLE_RAW in, say, three releases from now.
> 
> This ensures an easy forward compatibility (older perf tools -> newer kernel).
> But the backward compatibility is less easy (newer perf tools -> older kernel)
> as it means we need to test dynamically if we have PERF_SAMPLE_RAW_ALIGNED,
> otherwise we need to fall back to using the older one.

Frederic, I will send an updated version with PERF_SAMPLE_RAW_ALIGNED.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@....com

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