Re: [PATCH -mm 23/25] Noreclaim LRU scan sysctl

[Li Zefan <lizf@cn.fujitsu.com>]

> +static void show_page_path(struct page *page)
> +{
> +	char buf[256];
> +	if (page_file_cache(page)) {
> +		struct address_space *mapping = page->mapping;
> +		struct dentry *dentry;
> +		pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
> +
> +		spin_lock(&mapping->i_mmap_lock);
> +		dentry = d_find_alias(mapping->host);
> +		printk(KERN_INFO "rescued: %s %lu\n",
> +		       dentry_path(dentry, buf, 256), pgoff);
> +		spin_unlock(&mapping->i_mmap_lock);
> +	} else {
> +		struct anon_vma *anon_vma;
> +		struct vm_area_struct *vma;
> +
> +		anon_vma = page_lock_anon_vma(page);
> +		if (!anon_vma)
> +			return;
> +
> +		list_for_each_entry(vma, &anon_vma->head, anon_vma_node) {
> +			printk(KERN_INFO "rescued: anon %s\n",
> +			       vma->vm_mm->owner->comm);

This would cause compile failure if !CONFIG_MM_OWNER.

> +			break;
> +		}
> +		page_unlock_anon_vma(anon_vma);
> +	}
> +}