On Mon, Oct 29, 2012 at 12:30:44PM +0800, zwu.kernel@xxxxxxxxx wrote:
> +/* Frees the entire hot_range_tree. */
> +static void hot_inode_item_free(struct kref *kref)
> +{
> + struct hot_comm_item *comm_item = container_of(kref,
> + struct hot_comm_item, refs);
> + struct hot_inode_item *he = container_of(comm_item,
> + struct hot_inode_item, hot_inode);
> +
> + hot_range_tree_free(he);
> + radix_tree_delete(he->hot_inode_tree, he->i_ino);
void *radix_tree_delete(struct radix_tree_root *root, unsigned long index)
and he::i_ino is u64, this will not work when
sizeof(unsigned long) != sizeof(u64) (iirc this is a known limitation of
radix tree implementation). This will work on 64bit only, not sure if
this is intentional.
> + kmem_cache_free(hot_inode_item_cachep, he);
> +}
> +
> +/* Frees the entire hot_inode_tree. */
> +static void hot_inode_tree_exit(struct hot_info *root)
> +{
> + struct hot_inode_item *hi_nodes[8];
> + u64 ino = 0;
> + int i, n;
nitpick, put the declarations on separate lines
> +
> + while (1) {
> + spin_lock(&root->lock);
> + n = radix_tree_gang_lookup(&root->hot_inode_tree,
> + (void **)hi_nodes, ino,
> + ARRAY_SIZE(hi_nodes));
> + if (!n) {
> + spin_unlock(&root->lock);
> + break;
> + }
> +
> + ino = hi_nodes[n - 1]->i_ino + 1;
> + for (i = 0; i < n; i++)
> + hot_inode_item_put(hi_nodes[i]);
> + spin_unlock(&root->lock);
> + }
> +}
> +
> /*
> * Initialize kmem cache for hot_inode_item and hot_range_item.
> */
> @@ -106,3 +197,36 @@ err:
> kmem_cache_destroy(hot_inode_item_cachep);
> }
> EXPORT_SYMBOL_GPL(hot_cache_init);
> +
> +/*
> + * Initialize the data structures for hot data tracking.
> + */
> +int hot_track_init(struct super_block *sb)
> +{
> + struct hot_info *root;
> + int ret = -ENOMEM;
> +
> + root = kzalloc(sizeof(struct hot_info), GFP_NOFS);
> + if (!root) {
> + printk(KERN_ERR "%s: Failed to malloc memory for "
> + "hot_info\n", __func__);
> + return ret;
minor: you can drop the variable ret and just reurn ENOMEM here
> + }
> +
> + sb->s_hot_root = root;
> + hot_inode_tree_init(root);
> +
> + printk(KERN_INFO "VFS: Turning on hot data tracking\n");
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(hot_track_init);
david
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