> +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?
> + }
> + flush_tlb_mm(mm);
> + up_read(&mm->mmap_sem);
> + mmput(mm);
> + }
> + put_task_struct(task);
> +
> + return count;
> +}
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