函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\hugetlb.c Create Date:2022-07-27 17:01:22
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：follow_hugetlb_page

函数原型：long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, struct page **pages, struct vm_area_struct **vmas, unsigned long *position, unsigned long *nr_pages, long i, unsigned int flags, int *nonblocking)

返回类型：long

参数：

类型参数名称
struct mm_struct *mm
struct vm_area_struct *vma
struct page **pages
struct vm_area_struct **vmas
unsigned long *position
unsigned long *nr_pages
longi
unsigned intflags
int *nonblocking
4272  vaddr等于position
4273  remainder等于nr_pages
4274  h等于hstate_vma(vma)
4275  err等于负EFAULT
4277  当vaddr小于The first byte after our end addresswithin vm_mm. 且remainder循环
4279  spinlock_t * ptl = NULL
4287  如果fatal_signal_pending(当前进程)则
4288  remainder等于0
4289  退出
4299  pte等于huge_pte_offset(mm, vaddr & huge_page_mask(h), huge_page_size(h))
4301  如果pte则ptl等于huge_pte_lock(h, mm, pte)
4303  absent等于非pte或huge_pte_none(huge_ptep_get(pte))
4312  如果absent且flags按位与give error on hole if it would be zero 且非Return whether there is a pagecache page to back given address within VMA.* Caller follow_hugetlb_page() holds page_table_lock so we cannot lock_page.则
4314  如果pte则自旋锁解锁
4316  remainder等于0
4317  退出
4330  如果absent或heck whether a pte points to a swap entry 或flags按位与check pte is writable 且非huge_pte_write(huge_ptep_get(pte))则
4334  fault_flags等于0
4336  如果pte则自旋锁解锁
4338  如果flags按位与check pte is writable 则fault_flags或等于Fault was a write access
4340  如果nonblocking则fault_flags或等于Retry fault if blocking
4342  如果flags按位与 a disk transfer is needed, start the IO* and return without waiting upon it 则fault_flags或等于Retry fault if blocking 按位或Don't drop mmap_sem and wait when retrying
4345  如果flags按位与a retry, previous pass started an IO 则
4350  ret等于hugetlb_fault(mm, vma, vaddr, fault_flags)
4351  如果ret按位与VM_FAULT_ERROR则
4356  如果ret按位与VM_FAULT_RETRY则
4357  如果nonblocking且非fault_flags按位与Don't drop mmap_sem and wait when retrying 的值则nonblocking等于0
4360  nr_pages等于0
4370  返回:i
4372  继续下一循环
4375  pfn_offset等于vaddr按位与huge_page_mask(h)的反的值右移PAGE_SHIFT determines the page size 位
4376  page等于pte_page(huge_ptep_get(pte))
4382  如果此条件成立可能性小(为编译器优化)(page_count(page) <= 0)则
4383  如果pages则
4384  自旋锁解锁
4385  remainder等于0
4386  err等于负ENOMEM
4387  退出
4395  如果非pages且非vmas且非pfn_offset且vaddr加huge_page_size(h)小于The first byte after our end addresswithin vm_mm. 且remainder大于等于pages_per_huge_page(h)则
4398  vaddr加等于huge_page_size(h)
4399  remainder减等于pages_per_huge_page(h)
4400  i加等于pages_per_huge_page(h)
4401  自旋锁解锁
4402  继续下一循环
4405  same_page :
4406  如果pages则
4407  pages[i]等于Return the mem_map entry representing the 'offset' subpage within* the maximally aligned gigantic page 'base'. Handle any discontiguity* in the mem_map at MAX_ORDER_NR_PAGES boundaries.
4408  get_page(pages[i])
4411  如果vmas则vmas[i]等于vma
4414  vaddr加等于PAGE_SIZE
4415  pfn_offset先自加
4416  remainder先自减
4417  i先自加
4418  如果vaddr小于The first byte after our end addresswithin vm_mm. 且remainder且pfn_offset小于pages_per_huge_page(h)则
4424  转到:same_page
4426  自旋锁解锁
4428  nr_pages等于remainder
4434  position等于vaddr
4436  返回:如果i则i否则err
调用者
名称描述
__get_user_pages__get_user_pages() - pin user pages in memory*@tsk: task_struct of target task*@mm: mm_struct of target mm*@start: starting user address*@nr_pages: number of pages from start to pin*@gup_flags: flags modifying pin behaviour