Re: [PATCH v1 03/11] perf: Allow for multiple ring buffers per event

[Peter Zijlstra]

On Thu, May 08, 2014 at 03:34:17PM +0300, Alexander Shishkin wrote:
> Peter Zijlstra <peterz@xxxxxxxxxxxxx> writes:
> 
> > So the aux_head/tail values should also be in the file space and not
> > start at 0 again, similar for the offsets in the AUX record.
> 
> Thinking some more about it: if we keep aux_{offset,size} in userpg,
> then it would make sense to have aux_{head,tail} run from 0 to infinity
> similar to data_{head,tail}, especially considering that neither data_*
> nor aux_* pointers are file offsets anyway.

Yeah, this might make it easier. So then the rule is *_offset +
*_{head,tail} is the actual file offset into the buffer.

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