Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\rmap.c Create Date:2022-07-28 14:57:00
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:@arg: enum ttu_flags will be passed to this argument

Proto:static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma, unsigned long address, void *arg)

Type:bool

Parameter:

TypeParameterName
struct page *page
struct vm_area_struct *vma
unsigned longaddress
void *arg
1369  mm = The address space we belong to.
1370  struct page_vma_mapped_walk pvmw = {page = page, vma = vma, address = address, }
1377  bool ret = true
1379  flags = arg
1382  If flags & munlock mode && Not (Flags, see mm.h. & VM_LOCKED) Then Return true
1385  If IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_MIGRATION) && flags & migration mode && is_zone_device_page(page) && Not is_device_private_page(page) Then Return true
1389  If flags & split huge PMD if any Then
1390  split_huge_pmd_address(vma, address, flags & freeze pte under splitting thp , page)
1402  mmu_notifier_range_init( & range, MMU_NOTIFY_CLEAR, 0, vma, The address space we belong to. , address, min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(The first byte after our end addresswithin vm_mm. , address + Returns the number of bytes in this potentially compound page. ))
1405  If PageHuge(page) Then
1410  adjust_range_if_pmd_sharing_possible(vma, & start, & end)
1413  mmu_notifier_invalidate_range_start( & range)
1415  When 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 cycle
1431  If Not (flags & ignore mlock ) Then
1432  If Flags, see mm.h. & VM_LOCKED Then
1445  If flags & munlock mode Then Continue
1450  VM_BUG_ON_PAGE(!pte, page)
1452  subpage = page - page_to_pfn(page) + pte_pfn( * pte)
1453  address = address
1455  If PageHuge(page) Then
1456  If huge_pmd_unshare(mm, & address, pte) Then
1483  If IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_MIGRATION) && flags & migration mode && is_zone_device_page(page) Then
1489  pteval = ptep_get_and_clear(mm, address, pte)
1496  entry = make_migration_entry(page, 0)
1497  swp_pte = Convert the arch-independent representation of a swp_entry_t into the* arch-dependent pte representation.
1498  If pte_soft_dirty(pteval) Then swp_pte = pte_swp_mksoft_dirty(swp_pte)
1500  set_pte_at(mm, address, pte, swp_pte)
1512  subpage = page
1513  Go to discard
1516  If Not (flags & don't age ) Then
1517  If ptep_clear_flush_young_notify(vma, address, pte) Then
1519  ret = false
1520  page_vma_mapped_walk_done( & pvmw)
1521  Break
1526  flush_cache_page(vma, address, pte_pfn( * pte))
1527  If should_defer_flush(mm, flags) Then
1536  pteval = ptep_get_and_clear(mm, address, pte)
1538  set_tlb_ubc_flush_pending(mm, The following only work if pte_present() is true.* Undefined behaviour if not..)
1539  Else
1540  pteval = ptep_clear_flush(vma, address, pte)
1544  If The following only work if pte_present() is true.* Undefined behaviour if not.. Then Dirty a page
1548  update_hiwater_rss(mm)
1550  If PageHWPoison(page) && Not (flags & corrupted page is recoverable ) Then
1551  pteval = Convert the arch-independent representation of a swp_entry_t into the* arch-dependent pte representation.
1552  If PageHuge(page) Then
1557  Else
1562  Else if Some architectures provide facilities to virtualization guests* so that they can flag allocated pages as unused. This allows the* host to transparently reclaim unused pages. This function returns* whether the pte's page is unused. && Not userfaultfd_armed(vma) Then
1573  dec_mm_counter(mm, mm_counter(page))
1575  mmu_notifier_invalidate_range(mm, address, address + PAGE_SIZE)
1577  Else if IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_MIGRATION) && flags & ( migration mode | freeze pte under splitting thp ) Then
1582  If Some architectures support metadata associated with a page < 0 Then
1583  set_pte_at(mm, address, pte, pteval)
1584  ret = false
1585  page_vma_mapped_walk_done( & pvmw)
1586  Break
1594  entry = make_migration_entry(subpage, pte_write(pteval))
1596  swp_pte = Convert the arch-independent representation of a swp_entry_t into the* arch-dependent pte representation.
1597  If pte_soft_dirty(pteval) Then swp_pte = pte_swp_mksoft_dirty(swp_pte)
1599  set_pte_at(mm, address, pte, swp_pte)
1604  Else if PageAnon(page) Then
1605  swp_entry_t entry = {val = page_private(subpage)}
1611  If Value for the false possibility is greater at compile time(PageSwapBacked(page) != PageSwapCache(page)) Then
1612  WARN_ON_ONCE(1)
1613  ret = false
1615  mmu_notifier_invalidate_range(mm, address, address + PAGE_SIZE)
1617  page_vma_mapped_walk_done( & pvmw)
1618  Break
1622  If Not PageSwapBacked(page) Then
1623  If Not PageDirty(page) Then
1635  set_pte_at(mm, address, pte, pteval)
1636  SetPageSwapBacked(page)
1637  ret = false
1638  page_vma_mapped_walk_done( & pvmw)
1639  Break
1642  If swap_duplicate(entry) < 0 Then
1643  set_pte_at(mm, address, pte, pteval)
1644  ret = false
1645  page_vma_mapped_walk_done( & pvmw)
1646  Break
1648  If Some architectures support metadata associated with a page < 0 Then
1649  set_pte_at(mm, address, pte, pteval)
1650  ret = false
1651  page_vma_mapped_walk_done( & pvmw)
1652  Break
1654  If list_empty - tests whether a list is empty*@head: the list to test. Then
1660  dec_mm_counter(mm, MM_ANONPAGES)
1661  inc_mm_counter(mm, MM_SWAPENTS)
1662  swp_pte = Convert the arch-independent representation of a swp_entry_t into the* arch-dependent pte representation.
1663  If pte_soft_dirty(pteval) Then swp_pte = pte_swp_mksoft_dirty(swp_pte)
1665  set_pte_at(mm, address, pte, swp_pte)
1667  mmu_notifier_invalidate_range(mm, address, address + PAGE_SIZE)
1669  Else
1680  dec_mm_counter(mm, Optimized variant when page is already known not to be PageAnon )
1682  discard :
1690  page_remove_rmap - take down pte mapping from a page*@page: page to remove mapping from*@compound: uncharge the page as compound or small page* The caller needs to hold the pte lock.
1691  put_page(page)
1694  mmu_notifier_invalidate_range_end( & range)
1696  Return ret