linux-kernel - Re: [RFC v2 2/7] perf: add AUX area to ring buffer for raw data streams

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Message-ID: <20140624171943.GR3213@twins.programming.kicks-ass.net>
Date:	Tue, 24 Jun 2014 19:19:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Robert Richter <rric@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [RFC v2 2/7] perf: add AUX area to ring buffer for raw data
 streams

On Wed, Jun 11, 2014 at 06:41:45PM +0300, Alexander Shishkin wrote:
> +	/*
> +	 * Set up pmu-private data structures for an AUX area
> +	 */
> +	void *(*setup_aux)		(int cpu, void **pages,
> +					 int nr_pages, bool overwrite);
> +					/* optional */
> +
> +	/*
> +	 * Free pmu-private AUX data structures
> +	 */
> +	void (*free_aux)		(void *aux); /* optional */

I was hoping you could replace those with a PERF_CAP_AUX or something
and then have one generic allocation routine like you provide in the
subsequent patches.

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