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powerpc/64s/radix: prefetch user address in update_mmu_cache
Prefetch the faulting address in update_mmu_cache to give the page table walker perhaps 100 cycles head start as locks are dropped and the interrupt completed. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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2 changed files with 5 additions and 2 deletions
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@ -509,8 +509,10 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
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*/
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*/
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unsigned long access, trap;
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unsigned long access, trap;
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if (radix_enabled())
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if (radix_enabled()) {
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prefetch((void *)address);
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return;
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return;
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}
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/* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
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/* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
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if (!pte_young(*ptep) || address >= TASK_SIZE)
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if (!pte_young(*ptep) || address >= TASK_SIZE)
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@ -152,7 +152,8 @@ pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
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void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
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void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
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pmd_t *pmd)
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pmd_t *pmd)
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{
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{
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return;
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if (radix_enabled())
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prefetch((void *)addr);
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}
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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