try_to_unmap

函数名称：ry_to_unmap - try to remove all page table mappings to a page*@page: the page to get unmapped*@flags: action and flags* Tries to remove all the page table entries which are mapping this* page, used in the pageout path. Caller must hold the page lock.

函数原型：bool try_to_unmap(struct page *page, enum ttu_flags flags)

返回类型：bool

参数：

类型	参数	名称
struct page *	page
enum ttu_flags	flags

1735

struct rmap_walk_control rwc = { executed on each vma where page is mapped = @arg: enum ttu_flags will be passed to this argument, passed to rmap_one() and invalid_vma() = (void * )flags, for checking traversing termination condition = page_mapcount_is_zero, for getting anon_lock by optimized way rather than default = Similar to page_get_anon_vma() except it locks the anon_vma.* Its a little more complex as it tries to keep the fast path to a single* atomic op -- the trylock. If we fail the trylock, we fall back to getting a, }

1750

如果flags按位与 migration mode 按位或 freeze pte under splitting thp 的值且非A KSM page is one of those write-protected "shared pages" or "merged pages"* which KSM maps into multiple mms, wherever identical anonymous page content* is found in VM_MERGEABLE vmas. It's a PageAnon page, pointing not to any且PageAnon(page)则 for skipping uninterested vma等于invalid_migration_vma

1754

如果flags按位与 do not grab rmap lock: * caller holds it 则Like rmap_walk, but caller holds relevant rmap lock

1756

否则rmap_walk(page, & rwc)

1759

返回:!page_mapcount(page) ? true : false

**调用者**
名称	描述
__unmap_and_move
unmap_and_move_huge_page	Counterpart of unmap_and_move_page() for hugepage migration
unmap_page
hwpoison_user_mappings	Do all that is necessary to remove user space mappings. Unmap* the pages and send SIGBUS to the processes if the data was dirty.
shrink_page_list	shrink_page_list() returns the number of reclaimed pages

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告