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Date: Mon, 15 Dec 2008 15:18:01 +0100 From: Joerg Roedel <joerg.roedel@....com> To: iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org CC: Joerg Roedel <joerg.roedel@....com> Subject: [PATCH 18/22] AMD IOMMU: add stats counter for cross-page request Impact: see number of requests for more than one page in debugfs Signed-off-by: Joerg Roedel <joerg.roedel@....com> --- arch/x86/kernel/amd_iommu.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index a00d20c..02e8c18 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -70,6 +70,7 @@ DECLARE_STATS_COUNTER(cnt_map_sg); DECLARE_STATS_COUNTER(cnt_unmap_sg); DECLARE_STATS_COUNTER(cnt_alloc_coherent); DECLARE_STATS_COUNTER(cnt_free_coherent); +DECLARE_STATS_COUNTER(cross_page); static struct dentry *stats_dir; static struct dentry *de_isolate; @@ -103,6 +104,7 @@ static void amd_iommu_stats_init(void) amd_iommu_stats_add(&cnt_unmap_sg); amd_iommu_stats_add(&cnt_alloc_coherent); amd_iommu_stats_add(&cnt_free_coherent); + amd_iommu_stats_add(&cross_page); } #endif @@ -1216,6 +1218,9 @@ static dma_addr_t __map_single(struct device *dev, pages = iommu_num_pages(paddr, size, PAGE_SIZE); paddr &= PAGE_MASK; + if (pages > 1) + INC_STATS_COUNTER(cross_page); + if (align) align_mask = (1UL << get_order(size)) - 1; -- 1.5.6.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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