linux-kernel - Re: [PATCH] swiotlb: add kernel error message to track iobtlb overflow buffer usage

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Message-ID: <1346801051.3130.31.camel@lorien2>
Date:	Tue, 04 Sep 2012 17:24:11 -0600
From:	Shuah Khan <shuah.khan@...com>
To:	konrad.wilk@...cle.com
Cc:	akpm@...ux-foundation.org, paul.gortmaker@...driver.com,
	bhelgaas@...gle.com, amwang@...hat.com,
	linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp,
	shuahkhan@...il.com
Subject: Re: [PATCH] swiotlb: add kernel error message to track iobtlb
 overflow buffer usage

On Fri, 2012-08-31 at 18:55 -0600, Shuah Khan wrote:
> Add kernel error message to track iotlb overflow buffer triggers to understand
> how often the overflow buffer gets used.

Does this change look reasonable? My intent is to be able to assess how
often the overflow buffer usage gets triggered.

-- Shuah
> 
> Signed-off-by: Shuah Khan <shuah.khan@...com>
> ---
>  lib/swiotlb.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> index 45bc1f8..597d7b9 100644
> --- a/lib/swiotlb.c
> +++ b/lib/swiotlb.c
> @@ -682,6 +682,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
>  	if (!map) {
>  		swiotlb_full(dev, size, dir, 1);
>  		map = io_tlb_overflow_buffer;
> +		dev_err(dev, "SWIOTLB is full. Mapping overflow buffer.\n");
>  	}
>  
>  	dev_addr = swiotlb_virt_to_bus(dev, map);


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