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 17:40:37
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：__collapse_huge_page_isolate

函数原型：static int __collapse_huge_page_isolate(struct vm_area_struct *vma, unsigned long address, pte_t *pte)

返回类型：int

参数：

类型参数名称
struct vm_area_struct *vma
unsigned longaddress
pte_t *pte
536  struct page * page = NULL
538  none_or_zero等于0, result等于0, referenced等于0
539  bool writable = false
541  以_pte小于pte加HPAGE_PMD_NR循环
543  pteval等于_pte
544  如果pte_none(pteval)或pte_present(pteval)且is_zero_pfn(pte_pfn(pteval))则
546  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
548  继续下一循环
549  否则
550  result等于SCAN_EXCEED_NONE_PTE
551  转到:out
554  如果非pte_present(pteval)则
555  result等于SCAN_PTE_NON_PRESENT
556  转到:out
558  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
559  如果此条件成立可能性小(为编译器优化)(!page)则
560  result等于SCAN_PAGE_NULL
561  转到:out
565  如果PageCompound(page)则
566  result等于SCAN_PAGE_COMPOUND
567  转到:out
570  VM_BUG_ON_PAGE(!PageAnon(page), page)
578  如果非Return true if the page was successfully locked则
579  result等于SCAN_PAGE_LOCK
580  转到:out
588  如果page_count(page)不等于1加PageSwapCache(page)则
589  lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.
590  result等于SCAN_PAGE_COUNT
591  转到:out
593  如果pte_write(pteval)则
594  writable = true
595  否则
596  如果PageSwapCache(page)且非We can write to an anon page without COW if there are no other references* to it. And as a side-effect, free up its swap: because the old content* on disk will never be read, and seeking back there to write new content则
612  如果solate_lru_page - tries to isolate a page from its LRU list*@page: page to isolate from its LRU list* Isolates a @page from an LRU list, clears PageLRU and adjusts the* vmstat statistic corresponding to whatever LRU list the page was on.则
613  lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.
614  result等于SCAN_DEL_PAGE_LRU
615  转到:out
617  inc_node_page_state(page, Temporary isolated pages from anon lru + page_is_file_cache - should the page be on a file LRU or anon LRU?*@page: the page to test* Returns 1 if @page is page cache page backed by a regular filesystem,* or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed)
619  VM_BUG_ON_PAGE(!PageLocked(page), page)
620  VM_BUG_ON_PAGE(PageLRU(page), page)
623  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
628  如果此条件成立可能性大(为编译器优化)(writable)则
629  如果此条件成立可能性大(为编译器优化)(referenced)则
630  result等于SCAN_SUCCEED
631  trace_mm_collapse_huge_page_isolate(page, none_or_zero, referenced, writable, result)
633  返回:1
635  否则
636  result等于SCAN_PAGE_RO
639  out :
640  release_pte_pages(pte, _pte)
641  trace_mm_collapse_huge_page_isolate(page, none_or_zero, referenced, writable, result)
643  返回:0
调用者
名称描述
collapse_huge_page