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().. ?