int kthread_wss(void *data)
{
unsigned long va;
int ret;
int wss;
pgd_t *pgd;
pmd_t *pmd;
pud_t *pud;
pte_t *ptep;
struct task_struct *task;
while(!kthread_should_stop())
{
printk(KERN_INFO "Checking process' WSS.\n");
for_each_process(task)
{
wss = 0;
if(task->mm != NULL)
{
struct vm_area_struct *temp = task->mm->mmap;
while(temp)
{
if(temp->vm_flags & VM_IO){}
else
{
for(va = temp->vm_start; va < temp->vm_end; va+=PAGE_SIZE)
{
pgd = pgd_offset(task->mm,va);
if(pgd_none(*pgd))
break;
pud = pud_offset(pgd,va);
if(pud_none(*pud))
break;
pmd = pmd_offset(pud,va);
if(pmd_none(*pmd))
break;
ptep = pte_offset_map(pmd,va);
ret = 0;
if(pte_young(*ptep))
{
ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, (unsigned long *) &ptep->pte);
wss++;
}
if(ret)
{
pte_update(task->mm, va, ptep);
}
pte_unmap(ptep);
}
}
temp = temp->vm_next;
}
printk(KERN_INFO "%i: %i\n", task->pid, wss);
}
}
msleep(1000);
}
return 0;
}
void pte_update_defer(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
pte_update(mm, addr, ptep);
}
