From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755414Ab2IAA4G (ORCPT ); Fri, 31 Aug 2012 20:56:06 -0400 Received: from g4t0016.houston.hp.com ([15.201.24.19]:20105 "EHLO g4t0016.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755353Ab2IAA4F (ORCPT ); Fri, 31 Aug 2012 20:56:05 -0400 Message-ID: <1346460959.3393.3.camel@lorien2> Subject: [PATCH] swiotlb: add kernel error message to track iobtlb overflow buffer usage From: Shuah Khan Reply-To: shuah.khan@hp.com To: fujita.tomonori@lab.ntt.co.jp, akpm@linux-foundation.org, paul.gortmaker@windriver.com, bhelgaas@google.com, amwang@redhat.com, Konrad Rzeszutek Wilk Cc: linux-kernel@vger.kernel.org, shuahkhan@gmail.com Date: Fri, 31 Aug 2012 18:55:59 -0600 Organization: ISS-Linux Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add kernel error message to track iotlb overflow buffer triggers to understand how often the overflow buffer gets used. Signed-off-by: Shuah Khan --- 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); -- 1.7.9.5