linux-kernel - Re: [RFC][PATCH] perf tools: Merge trace.info content into perf.data

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Message-ID: <20091007081134.GA5043@nowhere>
Date:	Wed, 7 Oct 2009 10:11:37 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Mike Galbraith <efault@....de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] perf tools: Merge trace.info content into
	perf.data

On Wed, Oct 07, 2009 at 08:22:04AM +0200, Ingo Molnar wrote:
> 
> * Frederic Weisbecker <fweisbec@...il.com> wrote:
> 
> > Hi,
> > 
> > Here is an attempt to remove the trace.info file. It works well for 
> > me, the reason for it to be an RFC is that I have doubts about the 
> > backward compatibility.
> > 
> > A file created by perf after his patch is unsupported by previous 
> > version because the size of the headers have increased.
> 
> That's OK i think in terms of trace.info - trace.info was a temporary 
> hack to begin with.



Ok.


 
> > That said, it's two new fields that have been added in the end of the 
> > headers, and those could be ignored by previous versions if they just 
> > handled the dynamic header size and then ignore the unknow part. The 
> > offsets guarantee the compatibility.
> 
> Yes, that's how it should work.
> 
> > But previous versions handle the header size using its static size, 
> > not dynamic, then it's not backward compatible.
> > 
> > Anyway, I'm not sure exactly how to handle that.
> 
> That's a bug in the previous version - mind doing a standalone fix for 
> that so we can mark it Cc: stable?
> 


Ok, preparing this.

Thanks.

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