On Mon, Jun 13, 2016 at 06:07:09PM +0800, Hillf Danton wrote:
> > +static ssize_t reclaim_write(struct file *file, const char __user *buf,
> > + size_t count, loff_t *ppos)
> > +{
> > + struct task_struct *task;
> > + char buffer[PROC_NUMBUF];
> > + struct mm_struct *mm;
> > + struct vm_area_struct *vma;
> > + int itype;
> > + int rv;
> > + enum reclaim_type type;
> > +
> > + memset(buffer, 0, sizeof(buffer));
> > + if (count > sizeof(buffer) - 1)
> > + count = sizeof(buffer) - 1;
> > + if (copy_from_user(buffer, buf, count))
> > + return -EFAULT;
> > + rv = kstrtoint(strstrip(buffer), 10, &itype);
> > + if (rv < 0)
> > + return rv;
> > + type = (enum reclaim_type)itype;
> > + if (type < RECLAIM_FILE || type > RECLAIM_ALL)
> > + return -EINVAL;
> > +
> > + task = get_proc_task(file->f_path.dentry->d_inode);
> > + if (!task)
> > + return -ESRCH;
> > +
> > + mm = get_task_mm(task);
> > + if (mm) {
> > + struct mm_walk reclaim_walk = {
> > + .pmd_entry = reclaim_pte_range,
> > + .mm = mm,
> > + };
> > +
> > + down_read(&mm->mmap_sem);
> > + for (vma = mm->mmap; vma; vma = vma->vm_next) {
> > + reclaim_walk.private = vma;
> > +
> > + if (is_vm_hugetlb_page(vma))
> > + continue;
> > +
> > + if (!vma_is_anonymous(vma) && !(type & RECLAIM_FILE))
> > + continue;
> > +
> > + if (vma_is_anonymous(vma) && !(type & RECLAIM_ANON))
> > + continue;
> > +
> > + walk_page_range(vma->vm_start, vma->vm_end,
> > + &reclaim_walk);
>
> Check fatal signal after reclaiming a mapping?
Yeb, We might need it in page_walker.
Thanks.
