Re: [PATCH v4 02/22] perf: Add AUX area to ring buffer for raw data streams

[Peter Zijlstra]

On Tue, Oct 07, 2014 at 12:52:49AM +0300, Alexander Shishkin wrote:
> Peter Zijlstra <peterz@xxxxxxxxxxxxx> writes:

> > No, and I think I realized this after sending that email, but at the
> > time I figured there was another way to do it. Of course, now that
> > several weeks have passed I cannot for the life of me remember what it
> > was.
> >
> > Lemme go over these patches again to refresh my mind and maybe I'll
> > remember.
> 
> Yes, ring buffer can keep a refcount for the aux_priv object, which is
> grabbed once at mmap and once at perf_aux_output_begin() and released
> accordingly and whichever drops the refcount to zero calls
> pmu::free_aux. No need to grab page->_count and driver is a bit simpler.

Yes, I suppose that'll work just fine.
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