函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\huge_memory.c Create Date:2022-07-27 17:35:42
Last Modify:2020-03-12 14:18:49 Copyright©Brick
首页 函数Tree
注解内核,赢得工具下载SCCTEnglish

函数名称：do_huge_pmd_wp_page_fallback

函数原型：static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf, pmd_t orig_pmd, struct page *page)

返回类型：vm_fault_t

参数：

类型参数名称
struct vm_fault *vmf
pmd_torig_pmd
struct page *page
1201  vma等于Target VMA
1202  haddr等于Faulting virtual address 按位与HPAGE_PMD_MASK
1207  ret等于0
1211  pages等于分配数组内存
1213  如果此条件成立可能性小(为编译器优化)(!pages)则
1214  ret或等于VM_FAULT_OOM
1215  转到:out
1218  以i小于HPAGE_PMD_NR循环
1219  pages[i]等于alloc_page_vma_node(GFP_HIGHUSER_MOVABLE, vma, Faulting virtual address , page_to_nid(page))
1221  如果此条件成立可能性小(为编译器优化)(!pages[i] || mem_cgroup_try_charge_delay(pages[i], The address space we belong to. , GFP_KERNEL, & memcg, false))则
1224  如果pages[i]则Perform a free_page(), also freeing any swap cache associated with* this page if it is the last user of the page.
1226  当i先自减大于等于0循环
1233  释放内存
1234  ret或等于VM_FAULT_OOM
1235  转到:out
1237  set_page_private(pages[i], (unsignedlong)memcg)
1240  以i小于HPAGE_PMD_NR循环
1241  copy_user_highpage(pages[i], page + i, haddr + PAGE_SIZE * i, vma)
1243  __SetPageUptodate(pages[i])
1244  cond_resched()
1247  mmu_notifier_range_init( & range, MMU_NOTIFY_CLEAR, 0, vma, The address space we belong to. , haddr, haddr + HPAGE_PMD_SIZE)
1249  mmu_notifier_invalidate_range_start( & range)
1251  Page table lock.* Protects pte page table if 'pte'* is not NULL, otherwise pmd.等于pmd_lock(The address space we belong to. , Pointer to pmd entry matching* the 'address' )
1252  如果此条件成立可能性小(为编译器优化)(!pmd_same( * Pointer to pmd entry matching* the 'address' , orig_pmd))则转到:out_free_pages
1254  VM_BUG_ON_PAGE(!PageHead(page), page)
1264  pmdp_huge_clear_flush_notify(vma, haddr, Pointer to pmd entry matching* the 'address' )
1266  pgtable等于 "address" argument so destroys page coloring of some arch
1267  pmd_populate(The address space we belong to. , & _pmd, pgtable)
1269  以i小于HPAGE_PMD_NR循环
1271  entry等于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())(pages[i], Access permissions of this VMA. )
1272  entry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
1273  memcg等于page_private(pages[i])
1274  set_page_private(pages[i], 0)
1275  page_add_new_anon_rmap - add pte mapping to a new 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
1276  mem_cgroup_commit_charge(pages[i], memcg, TSC's on different sockets may be reset asynchronously.* This may cause the TSC ADJUST value on socket 0 to be NOT 0., false)
1277  lru_cache_add_active_or_unevictable*@page: the page to be added to LRU*@vma: vma in which page is mapped for determining reclaimability* Place @page on the active or unevictable LRU list, depending on its* evictability
1278  Pointer to pte entry matching* the 'address'. NULL if the page* table hasn't been allocated.等于pte_offset_map( & _pmd, haddr)
1279  VM_BUG_ON(!pte_none( * Pointer to pte entry matching* the 'address'. NULL if the page* table hasn't been allocated.))
1280  set_pte_at(The address space we belong to. , haddr, Pointer to pte entry matching* the 'address'. NULL if the page* table hasn't been allocated., entry)
1281  pte_unmap(Pointer to pte entry matching* the 'address'. NULL if the page* table hasn't been allocated.)
1283  释放内存
1285  smp_wmb()
1286  pmd_populate(The address space we belong to. , Pointer to pmd entry matching* the 'address' , pgtable)
1287  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.
1288  自旋锁解锁
1294  mmu_notifier_invalidate_range_only_end( & range)
1296  ret或等于VM_FAULT_WRITE
1297  Perform a free_page(), also freeing any swap cache associated with* this page if it is the last user of the page.
1299  out :
1300  返回:ret
1302  out_free_pages :
1303  自旋锁解锁
1304  mmu_notifier_invalidate_range_end( & range)
1305  以i小于HPAGE_PMD_NR循环
1306  memcg等于page_private(pages[i])
1307  set_page_private(pages[i], 0)
1308  mem_cgroup_cancel_charge(pages[i], memcg, false)
1309  Perform a free_page(), also freeing any swap cache associated with* this page if it is the last user of the page.
1311  释放内存
1312  转到:out
调用者
名称描述
do_huge_pmd_wp_page