On Tue, Jan 31, 2023 at 7:18 PM Ben Gardon <bgardon@xxxxxxxxxx> wrote: > > David Matlack recently added a feature known as eager page splitting > to x86 KVM. This feature improves vCPU performance during dirty > logging because the splitting operation is moved out of the page > fault path, avoiding EPT/NPT violations or allowing the vCPU threads > to resolve the violation in the fast path. > > While this feature is a great performance improvement, it does not > have adequate testing in KVM selftests. Add a test to provide coverage > of eager page splitting. > > Patch 1 is a quick refactor to be able to re-use some code from > dirty_log_perf_test. > Patch 2 adds the actual test. I have finally queued it, but made a small change to allow running it with non-hugetlbfs page types. Also, see the "KVM: selftests: skip hugetlb tests if huge pages are not available" patch I have just sent, which makes the test not fail in a default kernel configuration. Thanks, Paolo
