Hello,
In my opinion, the state of current should be TASK_RUNNING
after an mm_fault occurs.But I donot know why the function of
handle_mm_fault() set the state of current TASK_RUNNING.
/*
* By the time we get here, we already hold the mm semaphore
*/
int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct * vma,
unsigned long address, int write_access)
{
pgd_t *pgd;
pmd_t *pmd;
__set_current_state(TASK_RUNNING);
pgd = pgd_offset(mm, address);
inc_page_state(pgfault);
if (is_vm_hugetlb_page(vma))
return VM_FAULT_SIGBUS; /* mapping truncation does this. */
/*
* We need the page table lock to synchronize with kswapd
* and the SMP-safe atomic PTE updates.
*/
spin_lock(&mm->page_table_lock);
pmd = pmd_alloc(mm, pgd, address);
if (pmd) {
pte_t * pte = pte_alloc_map(mm, pmd, address);
if (pte)
return handle_pte_fault(mm, vma, address, write_access, pte, pmd);
}
spin_unlock(&mm->page_table_lock);
return VM_FAULT_OOM;
}
any help will be preferred.
Thank you!!
Jeff
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