Re: [BUG] perf stat: explicit grouping yields unexpected results

[Andi Kleen]

Stephane Eranian <eranian@xxxxxxxxxx> writes:
>>
> I don't understand why this need to be so complicated.
> Maybe just change the error code in case of group
> overcommitment? That way, the tool could distinguish
> and report the appropriate error message.

The existing errno is an ABI.

Also that would handle this case, but there are a bazillion other 
failure cases in perf. And we can't invent new errnos for all of them.

A string error interface would cover it all.

Usually when something strange like this happens in perf I have to apply
this patch
https://lkml.org/lkml/2013/3/8/432
and use ftrace to trace it down.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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