On Mon, 4 May 2020 22:29:07 +1000, Nicholas Piggin wrote:
> The idea behind this prefetch was to kick off a page table walk before
> returning from the fault, getting some pipelining advantage.
>
> But this never showed up any noticable performance advantage, and in
> fact with KUAP the prefetches are actually blocked and cause some
> kind of micro-architectural fault. Removing this improves page fault
> microbenchmark performance by about 9%.
Applied to powerpc/next.
[1/1] powerpc/64s/radix: Don't prefetch DAR in update_mmu_cache
https://git.kernel.org/powerpc/c/18594f9b8c45484bd527ebc6b08383b95f58ba73
cheers
