From: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>
Add initialization function to create some
key data structures when hot tracking is enabled;
Clean up them when hot tracking is disabled
Signed-off-by: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>
---
fs/hot_tracking.c | 115 ++++++++++++++++++++++++++++++++++++++++++
include/linux/fs.h | 4 ++
include/linux/hot_tracking.h | 3 +
3 files changed, 122 insertions(+), 0 deletions(-)
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index ef7ff09..1fd4d0e 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -76,12 +76,92 @@ static void hot_inode_item_init(struct hot_inode_item *he,
he->hot_inode_tree = hot_inode_tree;
kref_init(&he->hot_inode.refs);
spin_lock_init(&he->hot_inode.lock);
+ INIT_LIST_HEAD(&he->hot_inode.n_list);
he->hot_inode.hot_freq_data.avg_delta_reads = (u64) -1;
he->hot_inode.hot_freq_data.avg_delta_writes = (u64) -1;
he->hot_inode.hot_freq_data.flags = FREQ_DATA_TYPE_INODE;
hot_range_tree_init(he);
}
+static void hot_range_item_free(struct kref *kref)
+{
+ struct hot_comm_item *comm_item = container_of(kref,
+ struct hot_comm_item, refs);
+ struct hot_range_item *hr = container_of(comm_item,
+ struct hot_range_item, hot_range);
+
+ rb_erase(&hr->hot_range.rb_node,
+ &hr->hot_inode->hot_range_tree.map);
+ kmem_cache_free(hot_range_item_cachep, hr);
+}
+
+/*
+ * Drops the reference out on hot_range_item by one
+ * and free the structure if the reference count hits zero
+ */
+static void hot_range_item_put(struct hot_range_item *hr)
+{
+ kref_put(&hr->hot_range.refs, hot_range_item_free);
+}
+
+/* Frees the entire hot_range_tree. */
+static void hot_range_tree_free(struct hot_inode_item *he)
+{
+ struct rb_node *node;
+ struct hot_comm_item *ci;
+ struct hot_range_item *hr;
+
+ /* Free hot inode and range trees on fs root */
+ spin_lock(&he->lock);
+ while ((node = rb_first(&he->hot_range_tree.map))) {
+ ci = rb_entry(node, struct hot_comm_item, rb_node);
+ hr = container_of(ci,
+ struct hot_range_item, hot_range);
+ hot_range_item_put(hr);
+ }
+ spin_unlock(&he->lock);
+}
+
+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);
+ rb_erase(&he->hot_inode.rb_node, &he->hot_inode_tree->map);
+ kmem_cache_free(hot_inode_item_cachep, he);
+}
+
+/*
+ * Drops the reference out on hot_inode_item by one
+ * and free the structure if the reference count hits zero
+ */
+void hot_inode_item_put(struct hot_inode_item *he)
+{
+ kref_put(&he->hot_inode.refs, hot_inode_item_free);
+}
+EXPORT_SYMBOL_GPL(hot_inode_item_put);
+
+/* Frees the entire hot_inode_tree. */
+static void hot_inode_tree_exit(struct hot_info *root)
+{
+ struct rb_node *node;
+ struct hot_comm_item *ci;
+ struct hot_inode_item *he;
+
+ /* Free hot inode and range trees on fs root */
+ spin_lock(&root->lock);
+ while ((node = rb_first(&root->hot_inode_tree.map))) {
+ ci = rb_entry(node, struct hot_comm_item, rb_node);
+ he = container_of(ci,
+ struct hot_inode_item, hot_inode);
+ hot_inode_item_put(he);
+ }
+ spin_unlock(&root->lock);
+}
+
/*
* Initialize kmem cache for hot_inode_item and hot_range_item.
*/
@@ -107,3 +187,38 @@ 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;
+ }
+
+ hot_inode_tree_init(root);
+
+ sb->s_hot_root = root;
+
+ printk(KERN_INFO "VFS: Turning on hot data tracking\n");
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(hot_track_init);
+
+void hot_track_exit(struct super_block *sb)
+{
+ struct hot_info *root = sb->s_hot_root;
+
+ hot_inode_tree_exit(root);
+ sb->s_hot_root = NULL;
+ kfree(root);
+}
+EXPORT_SYMBOL_GPL(hot_track_exit);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b33cfc9..c541ae7 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -27,6 +27,7 @@
#include <linux/lockdep.h>
#include <linux/percpu-rwsem.h>
#include <linux/blk_types.h>
+#include <linux/hot_tracking.h>
#include <asm/byteorder.h>
#include <uapi/linux/fs.h>
@@ -1321,6 +1322,9 @@ struct super_block {
/* Being remounted read-only */
int s_readonly_remount;
+
+ /* Hot data tracking*/
+ struct hot_info *s_hot_root;
};
/* superblock cache pruning functions */
diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h
index aae8127..99d0f63 100644
--- a/include/linux/hot_tracking.h
+++ b/include/linux/hot_tracking.h
@@ -75,5 +75,8 @@ struct hot_info {
};
extern void __init hot_cache_init(void);
+extern int hot_track_init(struct super_block *sb);
+extern void hot_track_exit(struct super_block *sb);
+extern void hot_inode_item_put(struct hot_inode_item *he);
#endif /* _LINUX_HOTTRACK_H */
--
1.7.6.5
--
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