Messages in this thread | | | Subject | Re: [PATCH v4 7/9] iommu/vt-d: Add trace events for domain map/unmap | From | Lu Baolu <> | Date | Wed, 12 Jun 2019 10:31:34 +0800 |
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Hi,
On 6/11/19 12:08 AM, Konrad Rzeszutek Wilk wrote: > On Mon, Jun 03, 2019 at 09:16:18AM +0800, Lu Baolu wrote: >> This adds trace support for the Intel IOMMU driver. It >> also declares some events which could be used to trace >> the events when an IOVA is being mapped or unmapped in >> a domain. > > Is that even needed considering SWIOTLB also has tracing events? >
Currently there isn't any trace point in swiotlb_tbl_map_single(). If we want to add trace point there, I hope we can distinguish the bounce page events from other use cases (such as bounce buffer for direct dma), so that we could calculate how many percents of DMA buffers used by a specific device driver needs to use bounce page.
Best regards, Baolu
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