From: Zi Yan <[email protected]> pagemap_pud_range is added to print pud page flags properly.
Signed-off-by: Zi Yan <[email protected]> --- fs/proc/task_mmu.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 077196182288..04a3158d0d5b 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1553,6 +1553,68 @@ static int pagemap_pmd_range(pmd_t pmd, pmd_t *pmdp, unsigned long addr, return err; } +static int pagemap_pud_range(pud_t pud, pud_t *pudp, unsigned long addr, + unsigned long end, struct mm_walk *walk) +{ + struct vm_area_struct *vma = walk->vma; + struct pagemapread *pm = walk->private; + spinlock_t *ptl; + int err = 0; + +#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD + ptl = pud_trans_huge_lock(pudp, vma); + if (ptl) { + u64 flags = 0, frame = 0; + struct page *page = NULL; + + if (memcmp(pudp, &pud, sizeof(pud)) != 0) { + walk->action = ACTION_AGAIN; + spin_unlock(ptl); + return 0; + } + if (vma->vm_flags & VM_SOFTDIRTY) + flags |= PM_SOFT_DIRTY; + + if (pud_present(pud)) { + page = pud_page(pud); + + flags |= PM_PRESENT; + if (pud_soft_dirty(pud)) + flags |= PM_SOFT_DIRTY; + if (pm->show_pfn) + frame = pud_pfn(pud) + + ((addr & ~PUD_MASK) >> PAGE_SHIFT); + } + + if (page && page_mapcount(page) == 1) + flags |= PM_MMAP_EXCLUSIVE; + + for (; addr != end; addr += PAGE_SIZE) { + pagemap_entry_t pme = make_pme(frame, flags); + + err = add_to_pagemap(addr, &pme, pm); + if (err) + break; + if (pm->show_pfn) { + if (flags & PM_PRESENT) + frame++; + else if (flags & PM_SWAP) + frame += (1 << MAX_SWAPFILES_SHIFT); + } + } + spin_unlock(ptl); + walk->action = ACTION_CONTINUE; + return err; + } + + if (pud_trans_unstable(&pud)) { + walk->action = ACTION_AGAIN; + return 0; + } +#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ + return err; +} + #ifdef CONFIG_HUGETLB_PAGE /* This function walks within one hugetlb entry in the single call */ static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, @@ -1603,6 +1665,7 @@ static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, #endif /* HUGETLB_PAGE */ static const struct mm_walk_ops pagemap_ops = { + .pud_entry = pagemap_pud_range, .pmd_entry = pagemap_pmd_range, .pte_hole = pagemap_pte_hole, .hugetlb_entry = pagemap_hugetlb_range, -- 2.28.0
