On Wed, Jun 10, 2015 at 05:00:35PM +0900, Minchan Kim wrote:
> >
> > Ah, I recall. If there is no way to escape dirtifying the page in pte itself
> > maybe we should at least not make it softdirty on read faults?
>
> You mean this?
>
> diff --git a/mm/memory.c b/mm/memory.c
> index e1c45d0..c95340d 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -2557,9 +2557,14 @@ static int do_swap_page(struct mm_struct *mm, struct
> vm_area_struct *vma,
>
> inc_mm_counter_fast(mm, MM_ANONPAGES);
> dec_mm_counter_fast(mm, MM_SWAPENTS);
> - pte = mk_pte(page, vma->vm_page_prot);
> +
> + /* Mark dirty bit of page table because MADV_FREE relies on it */
> + pte = pte_mkdirty(mk_pte(page, vma->vm_page_prot));
> + if (!flgas & FAULT_FLAG_WRITE)
> + pte = pte_clear_flags(pte, _PAGE_SOFT_DIRTY)
> +
> if ((flags & FAULT_FLAG_WRITE) && reuse_swap_page(page)) {
> - pte = maybe_mkwrite(pte_mkdirty(pte), vma);
> + pte = maybe_mkwrite(pte, vma);
> flags &= ~FAULT_FLAG_WRITE;
> ret |= VM_FAULT_WRITE;
> exclusive = 1;
>
> It could be doable if everyone doesn't have strong objection
> on this patchset.
>
> I will wait more review.
Yeah, something like this. Lets wait for opinions, thanks!
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