Function report |
Source Code:mm\memory.c |
Create Date:2022-07-28 14:43:09 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
home page | Tree |
Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:do_cow_fault
Proto:static vm_fault_t do_cow_fault(struct vm_fault *vmf)
Type:vm_fault_t
Parameter:
Type | Parameter | Name |
---|---|---|
struct vm_fault * | vmf |
3669 | vma = Target VMA |
3672 | If Value for the false possibility is greater at compile time(anon_vma_prepare(vma)) Then Return VM_FAULT_OOM |
3675 | Page handler may use for COW fault = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, Faulting virtual address ) |
3676 | If Not Page handler may use for COW fault Then Return VM_FAULT_OOM |
3679 | If mem_cgroup_try_charge_delay(Page handler may use for COW fault , The address space we belong to. , GFP_KERNEL, & Cgroup cow_page belongs to , false) Then |
3682 | Return VM_FAULT_OOM |
3685 | ret = The mmap_sem must have been held on entry, and may have been* released depending on flags and vma->vm_ops->fault() return value.* See filemap_fault() and __lock_page_retry(). |
3686 | If Value for the false possibility is greater at compile time(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)) Then Go to uncharge_out |
3688 | If ret & VM_FAULT_DONE_COW Then Return ret |
3696 | put_page(->fault handlers should return a* page here, unless VM_FAULT_NOPAGE* is set (which is also implied by* VM_FAULT_ERROR).) |
3697 | If Value for the false possibility is greater at compile time(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)) Then Go to uncharge_out |
3699 | Return ret |
3700 | uncharge_out : |
3701 | mem_cgroup_cancel_charge(Page handler may use for COW fault , Cgroup cow_page belongs to , false) |
3703 | Return ret |
Name | Describe |
---|---|
do_fault | We enter with non-exclusive mmap_sem (to exclude vma changes,* but allow concurrent faults) |
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