On Fri, 13 Jan 2023 20:29:10 +0800, Lai Jiangshan wrote:
> Simplify pte_list_{add|remove} by ensuring all the non-head pte_list_desc
> to be full and addition/removal actions being performed on the head.
>
> To make pte_list_add() return a count as before, @tail_count is also
> added to the struct pte_list_desc.
>
> No visible performace is changed in tests. But pte_list_add() is no longer
> shown in the perf result for the COWed pages even the guest forks millions
> of tasks.
>
> [...]
Applied to kvm-x86 mmu, thanks! I added quite a few comments and a BUG_ON() to
sanity check that the head is never empty when trying to remove an entry, but I
didn't make anything changes to the code itself.
[1/1] kvm: x86/mmu: Simplify pte_list_{add|remove}
https://github.com/kvm-x86/linux/commit/141705b78381
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https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes
