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

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On 2022/9/30 16:30, David Hildenbrand wrote:
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."

Oh, this is better. Hi Andrew, do I need to resend the v4?


Acked-by: David Hildenbrand <david@xxxxxxxxxx>

Thanks.


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,
Qi




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