Re: [PATCH] perf tools: Exit recording if events have non matchingsample type
From: David Ahern
Date: Thu Sep 29 2011 - 19:33:59 EST
On 09/29/2011 05:06 PM, Arnaldo Carvalho de Melo wrote:
>> >From what I can see sample_type has to be the same for all samples:
>> https://lkml.org/lkml/2011/8/15/6
>
> We could add a PERF_SAMPLE_ID2 that if present would be guaranteed to be
> the last, or we can, as PeterZ prefers/suggests, to use one mmap per
> sample id, then we know that if we're getting it on that mmap, it has
> that sample_type.
>
> For record that means we need to dump each per-sample_id mmap onto a
> separate file, i.e. use a directory, etc.
That seems like a major re-write of perf. Why not keep the existing
restriction and have users who want different sample_types run multiple
perf commands?
What's to be gained by refactoring the code to support multiple
sample_types in a single command invocation?
David
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