Re: [PATCH] iommu/vt-d: Introduce a rb_tree for looking up device

[Joerg Roedel]

On Mon, Aug 21, 2023 at 12:16:59AM -0700, Huang Jiaqing wrote:
> The existing IO page fault handler locates the PCI device by calling
> pci_get_domain_bus_and_slot(), which searches the list of all PCI
> devices until the desired PCI device is found. This is inefficient
> because the algorithm efficiency of searching a list is O(n). In the
> critical path of handling an IO page fault, this can cause a significant
> performance bottleneck.

Can you elaborate a little more on the 'significant performance
bottleneck' part? Where do you see this as a problem?

Regards,

	Joerg