On February 04, 2017 7:33 AM Shaohua Li wrote:
> @@ -1404,6 +1401,8 @@ bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
> set_pmd_at(mm, addr, pmd, orig_pmd);
> tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
> }
> +
> + mark_page_lazyfree(page);
> ret = true;
> out:
> spin_unlock(ptl);
<snipped>
> -void deactivate_page(struct page *page)
> -{
> - if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) {
> - struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs);
> +void mark_page_lazyfree(struct page *page)
> + {
> + if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) &&
> + !PageUnevictable(page)) {
> + struct pagevec *pvec = &get_cpu_var(lru_lazyfree_pvecs);
>
> get_page(page);
> if (!pagevec_add(pvec, page) || PageCompound(page))
> - pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL);
> - put_cpu_var(lru_deactivate_pvecs);
> + pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL);
> + put_cpu_var(lru_lazyfree_pvecs);
> }
> }
You are not adding it but would you please try to fix or avoid flipping
preempt count with page table lock hold?
thanks
Hillf
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