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

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Message-ID: <20140507210843.GS19657@tassilo.jf.intel.com>
Date:	Wed, 7 May 2014 14:08:43 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH v1 03/11] perf: Allow for multiple ring buffers per event

> Then, when data inside that aux data store changes they should inject an
> PERF_RECORD_AUX to indicate this did happen, which ties it back into the
> normal event flow.

What happens when the aux buffer wraps? How would the client know
if the data belongs to this _AUX entry or some later one?

May need some extra sequence numbers in the mmap header and the aux
entry to handle this.

-Andi
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