函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\ksm.c Create Date:2022-07-27 17:14:13
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：place_page - replace page in vma by new ksm page*@vma: vma that holds the pte pointing to page*@page: the page we are replacing by kpage*@kpage: the ksm page we replace page by*@orig_pte: the original value of the pte

函数原型：static int replace_page(struct vm_area_struct *vma, struct page *page, struct page *kpage, pte_t orig_pte)

返回类型：int

参数：

类型参数名称
struct vm_area_struct *vma
struct page *page
struct page *kpage
pte_torig_pte
1122  mm等于The address space we belong to.
1128  err等于负EFAULT
1131  addr等于At what user virtual address is page expected in vma?* Caller should check the page is actually part of the vma.
1132  如果addr恒等于负EFAULT则转到:out
1135  pmd等于mm_find_pmd(mm, addr)
1136  如果非pmd则转到:out
1139  mmu_notifier_range_init( & range, MMU_NOTIFY_CLEAR, 0, vma, mm, addr, addr + PAGE_SIZE)
1141  mmu_notifier_invalidate_range_start( & range)
1143  ptep等于pte_offset_map_lock(mm, pmd, addr, & ptl)
1144  如果非pte_same( * ptep, orig_pte)则
1145  pte_unmap_unlock(ptep, ptl)
1146  转到:out_mn
1153  如果非is_zero_pfn(page_to_pfn(kpage))则
1154  get_page(kpage)
1155  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
1156  newpte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())(kpage, Access permissions of this VMA. )
1157  否则
1158  newpte等于pte_mkspecial(pfn_pte(page_to_pfn(kpage), Access permissions of this VMA. ))
1166  dec_mm_counter(mm, MM_ANONPAGES)
1169  flush_cache_page(vma, addr, pte_pfn( * ptep))
1176  ptep_clear_flush(vma, addr, ptep)
1177  set_pte_at_notify() sets the pte _after_ running the notifier.* This is safe to start by updating the secondary MMUs, because the primary MMU* pte invalidate must have already happened with a ptep_clear_flush() before* set_pte_at_notify() has been invoked(mm, addr, ptep, newpte)
1179  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.
1180  如果非Return true if this page is mapped into pagetables.* For compound page it returns true if any subpage of compound page is mapped.则If swap is getting full, or if there are no more mappings of this page,* then try_to_free_swap is called to free its swap space.
1182  Perform a free_page(), also freeing any swap cache associated with* this page if it is the last user of the page.
1184  pte_unmap_unlock(ptep, ptl)
1185  err等于0
1186  out_mn :
1187  mmu_notifier_invalidate_range_end( & range)
1188  out :
1189  返回:err
调用者
名称描述
try_to_merge_one_pagery_to_merge_one_page - take two pages and merge them into one*@vma: the vma that holds the pte pointing to page*@page: the PageAnon page that we want to replace with kpage*@kpage: the PageKsm page that we want to map instead of page,