[PATCH] powerpc/64s/radix: Don't prefetch DAR in update_mmu_cache

Michael Ellerman patch-notifications at ellerman.id.au
Tue Jun 9 15:29:31 AEST 2020


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


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