unmap_ref_private

函数名称：This is called when the original mapper is failing to COW a MAP_PRIVATE* mappping it owns the reserve page for. The intention is to unmap the page* from other VMAs and let the children be SIGKILLed if they are faulting the* same region.

函数原型：static void unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma, struct page *page, unsigned long address)

返回类型：void

参数：

类型	参数	名称
struct mm_struct *	mm
struct vm_area_struct *	vma
struct page *	page
unsigned long	address

3555

h等于hstate_vma(vma)

3564

address等于address按位与huge_page_mask(h)

3565

pgoff等于address减Our start address within vm_mm. 右移PAGE_SHIFT determines the page size 位的值加Offset (within vm_file) in PAGE_SIZEunits

3567

mapping等于f_mapping

3574

i_mmap_lock_write(mapping)

3577

如果iter_vma恒等于vma则继续下一循环

3585

如果Flags, see mm.h. 按位与VM_MAYSHARE则继续下一循环

3595

如果非is_vma_resv_set(iter_vma, Flags for MAP_PRIVATE reservations. These are stored in the bottom* bits of the reservation map pointer, which are always clear due to* alignment.)则unmap_hugepage_range(iter_vma, address, address + huge_page_size(h), page)

3599

i_mmap_unlock_write(mapping)

**调用者**
名称	描述
hugetlb_cow	Hugetlb_cow() should be called with page lock of the original hugepage held.* Called with hugetlb_instantiation_mutex held and pte_page locked so we* cannot race with other handlers or page migration.

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