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

[David Ahern]

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.

David

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