Re: [PATCH v2 01/13] mm: support madvise(MADV_FREE)
From: Sergey Senozhatsky <hidden>
Date: 2015-11-04 02:30:54
Also in:
linux-mm, lkml
On (11/04/15 10:25), Minchan Kim wrote: [..]
+static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr,
+ unsigned long end, struct mm_walk *walk)
+
+{
+ struct mmu_gather *tlb = walk->private;
+ struct mm_struct *mm = tlb->mm;
+ struct vm_area_struct *vma = walk->vma;
+ spinlock_t *ptl;
+ pte_t *pte, ptent;
+ struct page *page;I'll just ask (probably I'm missing something) + pmd_trans_huge_lock() ?
+ split_huge_page_pmd(vma, addr, pmd);
+ if (pmd_trans_unstable(pmd))
+ return 0;
+
+ pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
+ arch_enter_lazy_mmu_mode();
+ for (; addr != end; pte++, addr += PAGE_SIZE) {
+ ptent = *pte;
+
+ if (!pte_present(ptent))
+ continue;
+
+ page = vm_normal_page(vma, addr, ptent);
+ if (!page)
+ continue;
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