Re: [PATCH v3 1/2] mm: use update_mmu_tlb() on the second thread

[David Hildenbrand]

On 29.09.22 13:23, Qi Zheng wrote:
> As message in commit 7df676974359 ("mm/memory.c: Update local TLB
> if PTE entry exists") said, we should update local TLB only on the
> second thread. So in the do_anonymous_page() here, we should use
> update_mmu_tlb() instead of update_mmu_cache() on the second thread.

Maybe mention here "This only affects performance, but not correctness."

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

> Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
> Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> ---
>   mm/memory.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/memory.c b/mm/memory.c
> index 118e5f023597..9e11c783ba0e 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -4122,7 +4122,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
>   	vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, vmf->address,
>   			&vmf->ptl);
>   	if (!pte_none(*vmf->pte)) {
> -		update_mmu_cache(vma, vmf->address, vmf->pte);
> +		update_mmu_tlb(vma, vmf->address, vmf->pte);
>   		goto release;
>   	}
>   

--
Thanks,

David / dhildenb