函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\khugepaged.c Create Date:2022-07-27 17:41:15
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：khugepaged_scan_pmd

函数原型：static int khugepaged_scan_pmd(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, struct page **hpage)

返回类型：int

参数：

类型参数名称
struct mm_struct *mm
struct vm_area_struct *vma
unsigned longaddress
struct page **hpage
1122  ret等于0, none_or_zero等于0, result等于0, referenced等于0
1123  struct page * page = NULL
1126  node等于NUMA_NO_NODE, unmapped等于0
1127  bool writable = false
1129  VM_BUG_ON(address & ~HPAGE_PMD_MASK)
1131  pmd等于mm_find_pmd(mm, address)
1132  如果非pmd则
1133  result等于SCAN_PMD_NULL
1134  转到:out
1137  memset(khugepaged_node_load, 0, khugepaged_node_load的长度)
1138  pte等于pte_offset_map_lock(mm, pmd, address, & ptl)
1139  以_pte小于pte加HPAGE_PMD_NR循环
1141  pteval等于_pte
1142  如果heck whether a pte points to a swap entry 则
1143  如果unmapped先自加小于等于khugepaged_max_ptes_swap则
1144  继续下一循环
1145  否则
1146  result等于SCAN_EXCEED_SWAP_PTE
1147  转到:out_unmap
1150  如果pte_none(pteval)或is_zero_pfn(pte_pfn(pteval))则
1151  如果非userfaultfd_armed(vma)且none_or_zero先自加小于等于default collapse hugepages if there is at least one pte mapped like* it would have happened if the vma was large enough during page* fault.则
1153  继续下一循环
1154  否则
1155  result等于SCAN_EXCEED_NONE_PTE
1156  转到:out_unmap
1159  如果非pte_present(pteval)则
1160  result等于SCAN_PTE_NON_PRESENT
1161  转到:out_unmap
1163  如果pte_write(pteval)则writable = true
1166  page等于vm_normal_page -- This function gets the "struct page" associated with a pte.* "Special" mappings do not wish to be associated with a "struct page" (either* it doesn't exist, or it exists but they don't want to touch it). In this
1167  如果此条件成立可能性小(为编译器优化)(!page)则
1168  result等于SCAN_PAGE_NULL
1169  转到:out_unmap
1173  如果PageCompound(page)则
1174  result等于SCAN_PAGE_COMPOUND
1175  转到:out_unmap
1184  node等于page_to_nid(page)
1185  如果khugepaged_scan_abort(node)则
1186  result等于SCAN_SCAN_ABORT
1187  转到:out_unmap
1189  khugepaged_node_load[node]自加
1190  如果非PageLRU(page)则
1191  result等于SCAN_PAGE_LRU
1192  转到:out_unmap
1194  如果PageLocked(page)则
1195  result等于SCAN_PAGE_LOCK
1196  转到:out_unmap
1198  如果非PageAnon(page)则
1199  result等于SCAN_PAGE_ANON
1200  转到:out_unmap
1208  如果page_count(page)不等于1加PageSwapCache(page)则
1209  result等于SCAN_PAGE_COUNT
1210  转到:out_unmap
1212  如果pte_young(pteval)或page_is_young(page)或PageReferenced(page)或mmu_notifier_test_young(The address space we belong to. , address)则referenced自加
1217  如果writable则
1218  如果referenced则
1219  result等于SCAN_SUCCEED
1220  ret等于1
1221  否则
1222  result等于SCAN_LACK_REFERENCED_PAGE
1224  否则
1225  result等于SCAN_PAGE_RO
1227  out_unmap :
1228  pte_unmap_unlock(pte, ptl)
1229  如果ret则
1230  node等于khugepaged_find_target_node()
1232  collapse_huge_page(mm, address, hpage, node, referenced)
1234  out :
1235  trace_mm_khugepaged_scan_pmd(mm, page, writable, referenced, none_or_zero, result, unmapped)
1237  返回:ret
调用者
名称描述
khugepaged_scan_mm_slot