> > This is true, however, we want to account and observe the pages > > allocated by IOMMU subsystem for DMA buffers, as they are essentially > > unmovable locked pages. Should we separate IOMMU memory from KVM > > memory all together and add another field to /proc/meminfo, something > > like "iommu -> iommu pagetable and dma memory", or do we want to > > export DMA memory separately from IOMMU page tables? > > These are not allocated by "the IOMMU subsystem", they are allocated by > the DMA API. Even if you want to claim that a driver pinning memory via > iommu_dma_ops is somehow different from the same driver pinning the same > amount of memory via dma-direct when iommu.passthrough=1, it's still > nonsense because you're failing to account the pages which iommu_dma_ops > gets from CMA, dma_common_alloc_pages(), dynamic SWIOTLB, the various > pools, and so on. I see, IOMMU variants are used only for discontiguous allocations, and the common ones are defined outside of driver/iommu. Alright, I can remove all the changes for all no-page table related IOMMU allocations. Pasha
