Re: [PATCHv9 4/8] zswap: add to mm/

[Suleiman Souhlal <ssouhlal@FreeBSD.org>]

Hello,

On Apr 10, 2013, at 11:18 , Seth Jennings wrote:

> +/* invalidates all pages for the given swap type */
> +static void zswap_frontswap_invalidate_area(unsigned type)
> +{
> +	struct zswap_tree *tree = zswap_trees[type];
> +	struct rb_node *node;
> +	struct zswap_entry *entry;
> +
> +	if (!tree)
> +		return;
> +
> +	/* walk the tree and free everything */
> +	spin_lock(&tree->lock);
> +	/*
> +	 * TODO: Even though this code should not be executed because
> +	 * the try_to_unuse() in swapoff should have emptied the tree,
> +	 * it is very wasteful to rebalance the tree after every
> +	 * removal when we are freeing the whole tree.
> +	 *
> +	 * If post-order traversal code is ever added to the rbtree
> +	 * implementation, it should be used here.
> +	 */
> +	while ((node = rb_first(&tree->rbroot))) {
> +		entry = rb_entry(node, struct zswap_entry, rbnode);
> +		rb_erase(&entry->rbnode, &tree->rbroot);
> +		zs_free(tree->pool, entry->handle);
> +		zswap_entry_cache_free(entry);
> +	}
> +	tree->rbroot = RB_ROOT;
> +	spin_unlock(&tree->lock);
> +}

Should both the pool and the tree also be freed, here?

-- Suleiman

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