Re: [PATCH 19/19] perf tools: allow non-matching sample types

[Adrian Hunter]

On 18/10/13 17:25, David Ahern wrote:
> On 10/18/13 6:29 AM, Adrian Hunter wrote:
>> For kernels that do not support PERF_SAMPLE_IDENTIFIER,
>> sample types need not be identical to determine
>> the sample id from the event.  Only the position
>> of the sample id needs to be the same.
>>
>> Compatible sample types are ones in which the bits
>> defined by PERF_COMPAT_MASK are the same.
>> 'perf_evlist__config()' forces sample types to be
>> compatible on that basis.
> 
> Arnaldo and I have discussed adding callchain handling to perf-trace. To do
> that we only need stack data (including IP) for one event -- eg,
> raw_syscalls:sys_enter. That means raw_syscalls:sys_enter and
> raw_syscalls:sys_exit will have different attributes set - including ones in
> the MASK.

So how do you know which sample is which?

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