handle_mm

函数名称：By the time we get here, we already hold the mm semaphore* The mmap_sem may have been released depending on flags and our* return value. See filemap_fault() and __lock_page_or_retry().

函数原型：vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address, unsigned int flags)

返回类型：vm_fault_t

参数：

类型	参数	名称
struct vm_area_struct *	vma
unsigned long	address
unsigned int	flags

4160

set_current_state() includes a barrier so that the write of current->state* is correctly serialised wrt the caller's subsequent test of whether to* actually sleep:* for (;;) {* set_current_state(TASK_UNINTERRUPTIBLE);* if (!need_sleep)* break;* (就绪态)

4162

Disable counters

4163

count_memcg_event_mm(The address space we belong to. , PGFAULT)

4166

check_sync_rss_stat(当前进程)

4168

如果非arch_vma_access_permitted(vma, flags & Fault was a write access , flags & The fault was during an instruction fetch , flags & aulting for non current tsk/mm )则返回:VM_FAULT_SIGSEGV

4177

如果flags按位与The fault originated in userspace 则mem_cgroup_enter_user_fault()

4180

如果此条件成立可能性小(为编译器优化)(is_vm_hugetlb_page(vma))则ret等于hugetlb_fault(The address space we belong to. , vma, address, flags)

4182

否则ret等于By the time we get here, we already hold the mm semaphore* The mmap_sem may have been released depending on flags and our* return value. See filemap_fault() and __lock_page_or_retry().

4185

如果flags按位与The fault originated in userspace 则

4186

mem_cgroup_exit_user_fault()

4193

如果task_in_memcg_oom(当前进程)且非ret按位与VM_FAULT_OOM的值则mem_cgroup_oom_synchronize(false)

4197

返回:ret

**调用者**
名称	描述
fixup_user_fault	xup_user_fault() - manually resolve a user page fault@tsk: the task_struct to use for page fault accounting, or NULL if faults are not to be recorded
break_ksm	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,
hmm_vma_do_fault
faultin_page	mmap_sem must be held on entry. If @nonblocking != NULL and* @flags does not include FOLL_NOWAIT, the mmap_sem may be released. If it is, *@nonblocking will be set to 0 and -EBUSY returned.

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

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