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Date: Thu, 25 Oct 2012 23:08:54 +0800
From: zwu.kernel@...il.com
To: linux-fsdevel@...r.kernel.org
Cc: linux-ext4@...r.kernel.org, linux-btrfs@...r.kernel.org,
linux-kernel@...r.kernel.org, linuxram@...ux.vnet.ibm.com,
viro@...iv.linux.org.uk, david@...morbit.com, tytso@....edu,
cmm@...ibm.com, Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: [RFC v4 02/15] vfs,hot_track: initialize and free key data structures
From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
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@...ux.vnet.ibm.com>
---
fs/hot_tracking.c | 125 ++++++++++++++++++++++++++++++++++++++++++
include/linux/fs.h | 4 +
include/linux/hot_tracking.h | 3 +
3 files changed, 132 insertions(+), 0 deletions(-)
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index 6a0f2a3..5fef7e5 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -21,6 +21,8 @@
#include <linux/limits.h>
#include "hot_tracking.h"
+static struct hot_info *hot_root;
+
/* kmem_cache pointers for slab caches */
static struct kmem_cache *hot_inode_item_cachep __read_mostly;
static struct kmem_cache *hot_range_item_cachep __read_mostly;
@@ -75,12 +77,102 @@ static void hot_inode_item_init(struct hot_inode_item *he, u64 ino,
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);
+
+ radix_tree_delete(&hr->hot_inode->hot_range_tree, hr->start);
+ 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 hot_range_item *hr_nodes[8];
+ u32 start = 0;
+ int i, n;
+
+ while (1) {
+ spin_lock(&he->lock);
+ n = radix_tree_gang_lookup(&he->hot_range_tree,
+ (void **)hr_nodes, start,
+ ARRAY_SIZE(hr_nodes));
+ if (!n) {
+ spin_unlock(&he->lock);
+ break;
+ }
+
+ start = hr_nodes[n - 1]->start + 1;
+ for (i = 0; i < n; i++)
+ hot_range_item_put(hr_nodes[i]);
+ 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);
+ radix_tree_delete(he->hot_inode_tree, he->i_ino);
+ 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);
+}
+
+/* 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;
+
+ 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.
*/
@@ -105,3 +197,36 @@ void __init hot_cache_init(void)
err:
kmem_cache_destroy(hot_inode_item_cachep);
}
+
+/*
+ * 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;
+ }
+
+ sb->s_hot_root = 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);
+
+void hot_track_exit(struct super_block *sb)
+{
+ struct hot_info *root = sb->s_hot_root;
+
+ hot_inode_tree_exit(root);
+ 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 fcd4ad1..592a6eb 100644
--- a/include/linux/hot_tracking.h
+++ b/include/linux/hot_tracking.h
@@ -69,5 +69,8 @@ struct hot_info {
};
void __init hot_cache_init(void);
+int hot_track_init(struct super_block *sb);
+void hot_track_exit(struct super_block *sb);
+
#endif /* _LINUX_HOTTRACK_H */
--
1.7.6.5
--
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