Subject: + mm-introduce-do_read_fault.patch added to -mm tree To: kirill.shutemov@xxxxxxxxxxxxxxx,ak@xxxxxxxxxxxxxxx,dave.hansen@xxxxxxxxxxxxxxx,matthew.r.wilcox@xxxxxxxxx,mgorman@xxxxxxx,n-horiguchi@xxxxxxxxxxxxx,riel@xxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Mon, 10 Feb 2014 14:54:08 -0800 The patch titled Subject: mm: introduce do_read_fault() has been added to the -mm tree. Its filename is mm-introduce-do_read_fault.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-introduce-do_read_fault.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-introduce-do_read_fault.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Subject: mm: introduce do_read_fault() Introduce do_read_fault(). The function does what do_fault() does for read page faults. Unlike do_fault(), do_read_fault() is pretty clean and straightforward. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/memory.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff -puN mm/memory.c~mm-introduce-do_read_fault mm/memory.c --- a/mm/memory.c~mm-introduce-do_read_fault +++ a/mm/memory.c @@ -3317,6 +3317,43 @@ static int __do_fault(struct vm_area_str return ret; } +static int do_read_fault(struct mm_struct *mm, struct vm_area_struct *vma, + unsigned long address, pmd_t *pmd, + pgoff_t pgoff, unsigned int flags, pte_t orig_pte) +{ + struct page *fault_page; + spinlock_t *ptl; + pte_t entry, *pte; + int ret; + + ret = __do_fault(vma, address, pgoff, flags, &fault_page); + if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY))) + return ret; + + pte = pte_offset_map_lock(mm, pmd, address, &ptl); + if (unlikely(!pte_same(*pte, orig_pte))) { + pte_unmap_unlock(pte, ptl); + unlock_page(fault_page); + page_cache_release(fault_page); + return ret; + } + + flush_icache_page(vma, fault_page); + entry = mk_pte(fault_page, vma->vm_page_prot); + if (pte_file(orig_pte) && pte_file_soft_dirty(orig_pte)) + pte_mksoft_dirty(entry); + inc_mm_counter_fast(mm, MM_FILEPAGES); + page_add_file_rmap(fault_page); + set_pte_at(mm, address, pte, entry); + + /* no need to invalidate: a not-present page won't be cached */ + update_mmu_cache(vma, address, pte); + pte_unmap_unlock(pte, ptl); + unlock_page(fault_page); + + return ret; +} + /* * do_fault() tries to create a new page mapping. It aggressively * tries to share with existing pages, but makes a separate copy if @@ -3510,6 +3547,9 @@ static int do_linear_fault(struct mm_str - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; pte_unmap(page_table); + if (!(flags & FAULT_FLAG_WRITE)) + return do_read_fault(mm, vma, address, pmd, pgoff, flags, + orig_pte); return do_fault(mm, vma, address, pmd, pgoff, flags, orig_pte); } @@ -3542,6 +3582,9 @@ static int do_nonlinear_fault(struct mm_ } pgoff = pte_to_pgoff(orig_pte); + if (!(flags & FAULT_FLAG_WRITE)) + return do_read_fault(mm, vma, address, pmd, pgoff, flags, + orig_pte); return do_fault(mm, vma, address, pmd, pgoff, flags, orig_pte); } _ Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are pagewalk-update-page-table-walker-core.patch pagewalk-add-walk_page_vma.patch smaps-redefine-callback-functions-for-page-table-walker.patch clear_refs-redefine-callback-functions-for-page-table-walker.patch pagemap-redefine-callback-functions-for-page-table-walker.patch numa_maps-redefine-callback-functions-for-page-table-walker.patch memcg-redefine-callback-functions-for-page-table-walker.patch madvise-redefine-callback-functions-for-page-table-walker.patch arch-powerpc-mm-subpage-protc-use-walk_page_vma-instead-of-walk_page_range.patch pagewalk-remove-argument-hmask-from-hugetlb_entry.patch mempolicy-apply-page-table-walker-on-queue_pages_range.patch mm-hwpoison-release-page-on-pagehwpoison-in-__do_fault.patch mm-rename-__do_fault-do_fault.patch mm-do_fault-extract-to-call-vm_ops-do_fault-to-separate-function.patch mm-introduce-do_read_fault.patch mm-introduce-do_cow_fault.patch mm-introduce-do_shared_fault-and-drop-do_fault.patch mm-consolidate-code-to-call-vm_ops-page_mkwrite.patch mm-consolidate-code-to-setup-pte.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html