Re: [PATCH] mm: Track page table modifications in __apply_to_page_range() construction

Joerg Roedel
2020-08-21T12:18:22Z

On Fri, Aug 21, 2020 at 12:38:03PM +0100, Chris Wilson wrote:
> In the version I tested, I also had
>
> @@ -2216,7 +2216,7 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
>
> if (create) {
> pte = (mm == &init_mm) ?
> - pte_alloc_kernel(pmd, addr) :
> + pte_alloc_kernel_track(pmd, addr, mask) :
> pte_alloc_map_lock(mm, pmd, addr, &ptl);
> if (!pte)
> return -ENOMEM;
>
> And that PGTBL_PMD_MODIFIED makes a difference.

Right, thanks. Added that too.