Re: [tip:perf/core] tracing/events: Add 'signed' field to format files

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On Tue, Oct 06, 2009 at 01:06:39PM +0000, tip-bot for Tom Zanussi wrote:
> Commit-ID:  26a50744b21fff65bd754874072857bee8967f4d
> Gitweb:     http://git.kernel.org/tip/26a50744b21fff65bd754874072857bee8967f4d
> Author:     Tom Zanussi <tzanussi@xxxxxxxxx>
> AuthorDate: Tue, 6 Oct 2009 01:09:50 -0500
> Committer:  Ingo Molnar <mingo@xxxxxxx>
> CommitDate: Tue, 6 Oct 2009 15:04:45 +0200
> 
> tracing/events: Add 'signed' field to format files
> 
> The sign info used for filters in the kernel is also useful to
> applications that process the trace stream.  Add it to the format
> files and make it available to userspace.



This is something we could already find using the type of
the field.

Also I wonder if that breaks the format definition ABI. I mean:
event formats are not ABI, except for the TRACE_EVENT_ABI.
But concerning how we describe the format description, I
have doubts.

As an example, I don't know if this patch would break 2.6.32-rc1
(and then 2.6.32) based perf tools running on a future 2.6.33
kernel.

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