David S. Ahern wrote:
I've been instrumenting the guest kernel as well. It's the scanning of the active lists that triggers a lot of calls to paging64_prefetch_page, and, as you guys know, correlates with the number of direct pages in the list. Earlier in this thread I traced the kvm cycles to paging64_prefetch_page(). See
I optimized this function a bit, hopefully it will relieve some of the pain. We still need to reduce the number of times it is called.
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