Messages in this thread | | | Date | Fri, 12 Apr 2024 11:41:11 -0700 | From | David Matlack <> | Subject | Re: [PATCH v3 0/7] mm/kvm: Improve parallelism for access bit harvesting |
| |
On 2024-04-01 11:29 PM, James Houghton wrote: > This patchset adds a fast path in KVM to test and clear access bits on > sptes without taking the mmu_lock. It also adds support for using a > bitmap to (1) test the access bits for many sptes in a single call to > mmu_notifier_test_young, and to (2) clear the access bits for many ptes > in a single call to mmu_notifier_clear_young.
How much improvement would we get if we _just_ made test/clear_young lockless on x86 and hold the read-lock on arm64? And then how much benefit does the bitmap look-around add on top of that?
| |