函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\migrate.c Create Date:2022-07-27 17:32:21
Last Modify:2022-05-20 09:53:13 Copyright©Brick
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函数名称：Restore a potential migration pte to a working pte entry

函数原型：static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma, unsigned long addr, void *old)

返回类型：bool

参数：

类型参数名称
struct page *page
struct vm_area_struct *vma
unsigned longaddr
void *old
207  struct page_vma_mapped_walk pvmw = {page = old, vma = vma, address = addr, flags = Avoid racy checks | Look for migarion entries rather than present PTEs , }
217  VM_BUG_ON_PAGE(PageTail(page), page)
218  当page_vma_mapped_walk - check if @pvmw->page is mapped in @pvmw->vma at*@pvmw->address*@pvmw: pointer to struct page_vma_mapped_walk. page, vma, address and flags* must be set. pmd, pte and ptl must be NULL.* Returns true if the page is mapped in the vma循环
219  如果A KSM page is one of those write-protected "shared pages" or "merged pages"* which KSM maps into multiple mms, wherever identical anonymous page content* is found in VM_MERGEABLE vmas. It's a PageAnon page, pointing not to any则new等于page
221  否则new等于page减 Our offset within mapping. 加linear_page_index(vma, address)
234  get_page(new)
235  pte等于pte_mkold(Conversion functions: convert a page and protection to a page entry,* and a page entry and page directory to the page they refer to.* (Currently stuck as a macro because of indirect forward reference* to linux/mm.h:page_to_nid())(new, READ_ONCE(Access permissions of this VMA. )))
236  如果pte_swp_soft_dirty( * pte)则pte等于pte_mksoft_dirty(pte)
242  entry等于Convert the arch-dependent pte representation of a swp_entry_t into an* arch-independent swp_entry_t.
243  如果is_write_migration_entry(entry)则pte等于Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when* servicing faults for write access. In the normal case, do always want* pte_mkwrite. But get_user_pages can cause write faults for mappings
246  如果此条件成立可能性小(为编译器优化)(is_zone_device_page(new))则
247  如果is_device_private_page(new)则
254  如果PageHuge() only returns true for hugetlbfs pages, but not for normal or* transparent huge pages. See the PageTransHuge() documentation for more* details.则
255  pte等于pte_mkhuge(pte)
256  pte等于arch_make_huge_pte(pte, vma, new, 0)
257  set_huge_pte_at(The address space we belong to. , address, pte, pte)
258  如果PageAnon(new)则The following two functions are for anonymous (private mapped) hugepages.* Unlike common anonymous pages, anonymous hugepages have no accounting code* and no lru code, because we handle hugepages differently from common pages.
260  否则page_dup_rmap(new, true)
262  否则
265  set_pte_at(The address space we belong to. , address, pte, pte)
267  如果PageAnon(new)则page_add_anon_rmap - add pte mapping to an anonymous page*@page: the page to add the mapping to*@vma: the vm area in which the mapping is added*@address: the user virtual address mapped*@compound: charge the page as compound or small page* The caller
269  否则page_add_file_rmap - add pte mapping to a file page*@page: the page to add the mapping to*@compound: charge the page as compound or small page* The caller needs to hold the pte lock.
272  如果Flags, see mm.h. 按位与VM_LOCKED且非PageTransCompound returns true for both transparent huge pages* and hugetlbfs pages, so it should only be called when it's known* that hugetlbfs pages aren't involved.则Mark page as mlocked if not already.* If page on LRU, isolate and putback to move to unevictable list.
275  如果PageHuge() only returns true for hugetlbfs pages, but not for* normal or transparent huge pages.* PageTransHuge() returns true for both transparent huge and* hugetlbfs pages, but not normal pages. PageTransHuge() can only be且PageMlocked(page)则LRU accounting for clear_page_mlock()
279  The x86 doesn't have any external MMU info: the kernel page* tables contain all the necessary information.
282  返回:true