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Message-Id: <1351177747-19389-9-git-send-email-zwu.kernel@gmail.com>
Date: Thu, 25 Oct 2012 23:09:00 +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 08/15] vfs,hot_track: add one work queue
From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Add a per-superblock workqueue and a work_struct
to run periodic work to update map info on each superblock.
Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
---
fs/hot_tracking.c | 85 ++++++++++++++++++++++++++++++++++++++++++
fs/hot_tracking.h | 3 +
include/linux/hot_tracking.h | 3 +
3 files changed, 91 insertions(+), 0 deletions(-)
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index 575cd3a..d931083 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -15,9 +15,12 @@
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/hardirq.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/types.h>
+#include <linux/list_sort.h>
#include <linux/limits.h>
#include "hot_tracking.h"
@@ -589,6 +592,67 @@ static void hot_map_array_exit(struct hot_info *root)
}
}
+/* Temperature compare function*/
+static int hot_temp_cmp(void *priv, struct list_head *a,
+ struct list_head *b)
+{
+ struct hot_comm_item *ap =
+ container_of(a, struct hot_comm_item, n_list);
+ struct hot_comm_item *bp =
+ container_of(b, struct hot_comm_item, n_list);
+
+ int diff = ap->hot_freq_data.last_temp
+ - bp->hot_freq_data.last_temp;
+ if (diff > 0)
+ return -1;
+ if (diff < 0)
+ return 1;
+ return 0;
+}
+
+/*
+ * Every sync period we update temperatures for
+ * each hot inode item and hot range item for aging
+ * purposes.
+ */
+static void hot_update_worker(struct work_struct *work)
+{
+ struct hot_info *root = container_of(to_delayed_work(work),
+ struct hot_info, update_work);
+ struct hot_inode_item *hi_nodes[8];
+ u64 ino = 0;
+ int i, n;
+
+ while (1) {
+ n = radix_tree_gang_lookup(&root->hot_inode_tree,
+ (void **)hi_nodes, ino,
+ ARRAY_SIZE(hi_nodes));
+ if (!n)
+ break;
+
+ ino = hi_nodes[n - 1]->i_ino + 1;
+ for (i = 0; i < n; i++) {
+ kref_get(&hi_nodes[i]->hot_inode.refs);
+ hot_map_array_update(
+ &hi_nodes[i]->hot_inode.hot_freq_data, root);
+ hot_range_update(hi_nodes[i], root);
+ hot_inode_item_put(hi_nodes[i]);
+ }
+ }
+
+ /* Sort temperature map info */
+ for (i = 0; i < HEAT_MAP_SIZE; i++) {
+ list_sort(NULL, &root->heat_inode_map[i].node_list,
+ hot_temp_cmp);
+ list_sort(NULL, &root->heat_range_map[i].node_list,
+ hot_temp_cmp);
+ }
+
+ /* Instert next delayed work */
+ queue_delayed_work(root->update_wq, &root->update_work,
+ msecs_to_jiffies(HEAT_UPDATE_DELAY * MSEC_PER_SEC));
+}
+
/*
* Initialize kmem cache for hot_inode_item and hot_range_item.
*/
@@ -681,9 +745,28 @@ int hot_track_init(struct super_block *sb)
hot_inode_tree_init(root);
hot_map_array_init(root);
+ root->update_wq = alloc_workqueue(
+ "hot_update_wq", WQ_NON_REENTRANT, 0);
+ if (!root->update_wq) {
+ printk(KERN_ERR "%s: Failed to create "
+ "hot update workqueue\n", __func__);
+ goto failed_wq;
+ }
+
+ /* Initialize hot tracking wq and arm one delayed work */
+ INIT_DELAYED_WORK(&root->update_work, hot_update_worker);
+ queue_delayed_work(root->update_wq, &root->update_work,
+ msecs_to_jiffies(HEAT_UPDATE_DELAY * MSEC_PER_SEC));
+
printk(KERN_INFO "VFS: Turning on hot data tracking\n");
return 0;
+
+failed_wq:
+ hot_map_array_exit(root);
+ hot_inode_tree_exit(root);
+ kfree(root);
+ return ret;
}
EXPORT_SYMBOL_GPL(hot_track_init);
@@ -691,6 +774,8 @@ void hot_track_exit(struct super_block *sb)
{
struct hot_info *root = sb->s_hot_root;
+ cancel_delayed_work_sync(&root->update_work);
+ destroy_workqueue(root->update_wq);
hot_map_array_exit(root);
hot_inode_tree_exit(root);
kfree(root);
diff --git a/fs/hot_tracking.h b/fs/hot_tracking.h
index 67c6fb6..b9d9717 100644
--- a/fs/hot_tracking.h
+++ b/fs/hot_tracking.h
@@ -31,6 +31,9 @@
*/
#define TIME_TO_KICK 300
+/* set how often to update temperatures (seconds) */
+#define HEAT_UPDATE_DELAY 300
+
/*
* The following comments explain what exactly comprises a unit of heat.
*
diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h
index 0ce2ef8..4c5f5f3 100644
--- a/include/linux/hot_tracking.h
+++ b/include/linux/hot_tracking.h
@@ -82,6 +82,9 @@ struct hot_info {
/* map of range temperature */
struct hot_map_head heat_range_map[HEAT_MAP_SIZE];
unsigned int hot_map_nr;
+
+ struct workqueue_struct *update_wq;
+ struct delayed_work update_work;
};
void __init hot_cache_init(void);
--
1.7.6.5
--
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