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Message-ID: <0fecbcdc-7324-2d76-8452-b60b4638d074@redhat.com>
Date:   Fri, 30 Sep 2022 10:30:38 +0200
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Subject: Re: [PATCH v3 1/2] mm: use update_mmu_tlb() on the second thread
To:     Qi Zheng <zhengqi.arch@bytedance.com>, akpm@linux-foundation.org,
        maobibo@loongson.cn, chenhuacai@loongson.cn,
        songmuchun@bytedance.com
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        loongarch@lists.linux.dev, chris@zankel.net, jcmvbkbc@gmail.com
References: <20220929112318.32393-1-zhengqi.arch@bytedance.com>
 <20220929112318.32393-2-zhengqi.arch@bytedance.com>
Content-Language: en-US
From:   David Hildenbrand <david@redhat.com>
Organization: Red Hat
In-Reply-To: <20220929112318.32393-2-zhengqi.arch@bytedance.com>
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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@redhat.com>

> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
> Reviewed-by: Muchun Song <songmuchun@bytedance.com>
> ---
>   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