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SubjectRe: [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@gmail.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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