linux-kernel - Re: [PATCH] tracing/events: Add bounce tracing to swiotbl-xen

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Date:	Thu, 22 Aug 2013 18:02:09 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xensource.com>,
	<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH] tracing/events: Add bounce tracing to swiotbl-xen

On Thu, 22 Aug 2013 22:47:28 +0100
Zoltan Kiss <zoltan.kiss@...rix.com> wrote:


>  /*
>   * Used to do a quick range check in swiotlb_tbl_unmap_single and
>   * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
> @@ -358,6 +362,9 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
>  	/*
>  	 * Oh well, have to allocate and map a bounce buffer.
>  	 */
> +
> +	trace_bounced(dev, dev_addr, size, swiotlb_force);

Please use a more specific name. "bounce" is too generic. I know
tracepoints are grouped by systems, but its easier for tools to just
state a tracepoint name than the system:event pair.

trace_xen_bounced()
 or
trace_swiotlb_bounced()

Something other than just "bounced".

Thanks!

-- Steve

> +
>  	map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir);
>  	if (map == SWIOTLB_MAP_ERROR)
>  		return DMA_ERROR_CODE;
--
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