[lttng-dev] Question about TRACEPOINT_FORMAT

[Amit Margalit]

Hello,

I've read the discussion in the past about this suggested feature, and I'd 
like to ask what has become of this. Is this still being considered? Has 
anyone come up with an idea for a solution that does not include extending 
CTF?

I understand that CTF doesn't support looking into the ELF binary, but 
perhaps there is a way around this.

First, I'd like to explain what I wish to have, so that maybe a different 
solution could be suggested -
In all, migration from an existing log-to-file system for existing 
projects may push the entire formatted string as the trace entry.
We'd like to avoid storing the entire format string multiple times, as 
this is wasteful, of course, and we'd like the viewer to be in charge of 
performing the formatting.

I was wondering whether we could use CTF enums. The CTF specification for 
enums doesn't say that the textual representation of the value has to be a 
valid identifier. In fact, the example includes a quoted string.

An instrumentation tool could generate code that writes an enum 
description into the metadata, where each value corresponds to a different 
format string.

Thanks,

Amit Margalit
IBM XIV - Storage Reinvented
XIV-NAS Development Team
Tel. 03-689-7774
Fax. 03-689-7230
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