linux-kernel - Re: [RFC v2 6/7] perf: add api for pmus to write to AUX space

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Message-ID: <20140624172723.GS3213@twins.programming.kicks-ass.net>
Date:	Tue, 24 Jun 2014 19:27:23 +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 6/7] perf: add api for pmus to write to AUX space

On Wed, Jun 11, 2014 at 06:41:49PM +0300, Alexander Shishkin wrote:
> +void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size,
> +			 bool truncated)
> +{
> +	struct ring_buffer *rb = handle->rb;
> +	unsigned long aux_head;
> +
> +	aux_head = local_read(&rb->aux_head);
> +	local_add(size, &rb->aux_head);
> +
> +	rb->user_page->aux_head = local_read(&rb->aux_head);
> +	smp_wmb();
> +
> +	perf_output_wakeup(handle);
> +	handle->event = NULL;
> +
> +	ring_buffer_put(rb);
> +}

This thing is distinctly less complex than perf_output_put_handle().. ?

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