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 17:14:01
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Though it's very tempting to unmerge rmap_items from stable tree rather* than check every pte of a given vma, the locking doesn't quite work for* that - an rmap_item is assigned to the stable tree after inserting ksm* page and upping mmap_sem

函数原型：static int unmerge_ksm_pages(struct vm_area_struct *vma, unsigned long start, unsigned long end)

返回类型：int

参数：

类型参数名称
struct vm_area_struct *vma
unsigned longstart
unsigned longend
847  err等于0
849  以addr小于end且非err循环
850  如果ksmd, and unmerge_and_remove_all_rmap_items(), must not touch an mm's* page tables after it has passed through ksm_exit() - which, if necessary,* takes mmap_sem briefly to serialize against them. ksm_exit() does not set则退出
852  如果signal_pending(当前进程)则err等于负These should never be seen by user programs. To return one of ERESTART** codes, signal_pending() MUST be set. Note that ptrace can observe these* at syscall exit tracing, but they will never be left for the debugged user* process to see.
854  否则err等于We use break_ksm to break COW on a ksm page: it's a stripped down* if (get_user_pages(addr, 1, 1, 1, &page, NULL) == 1)* put_page(page);* but taking great care only to touch a ksm page, in a VM_MERGEABLE vma,
857  返回:err
调用者
名称描述
ksm_madvise