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Date: Thu, 20 Dec 2012 22:43:29 +0800
From: zwu.kernel@...il.com
To: linux-fsdevel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
david@...morbit.com, dave@...os.cz, darrick.wong@...cle.com,
andi@...stfloor.org, hch@...radead.org,
linuxram@...ux.vnet.ibm.com, zwu.kernel@...il.com,
wuzhy@...ux.vnet.ibm.com
Subject: [PATCH RESEND v1 10/16] vfs: add FS hot type support
From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Introduce one way to enable that specific FS
can inject its own hot tracking type.
Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
---
fs/hot_tracking.c | 43 +++++++++++++++++++++++++++++++----------
fs/hot_tracking.h | 1 -
include/linux/fs.h | 1 +
include/linux/hot_tracking.h | 19 ++++++++++++++++++
4 files changed, 52 insertions(+), 12 deletions(-)
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index 383cc54..07a2a81 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -64,8 +64,11 @@ void hot_range_tree_init(struct hot_inode_item *he)
static void hot_range_item_init(struct hot_range_item *hr, loff_t start,
struct hot_inode_item *he)
{
+ struct hot_info *root = container_of(he->hot_inode_tree,
+ struct hot_info, hot_inode_tree);
+
hr->start = start;
- hr->len = RANGE_SIZE;
+ hr->len = hot_raw_shift(1, root->hot_type->range_bits, true);
hr->hot_inode = he;
kref_init(&hr->hot_range.refs);
spin_lock_init(&hr->hot_range.lock);
@@ -305,19 +308,21 @@ static void hot_rw_freq_calc(struct timespec old_atime,
*avg = *avg >> FREQ_POWER;
}
-static void hot_freq_data_update(struct hot_freq_data *freq_data, bool write)
+static void hot_freq_data_update(struct hot_info *root,
+ struct hot_freq_data *freq_data, bool write)
{
struct timespec cur_time = current_kernel_time();
if (write) {
freq_data->nr_writes += 1;
- hot_rw_freq_calc(freq_data->last_write_time,
+ root->hot_type->ops.hot_rw_freq_calc_fn(
+ freq_data->last_write_time,
cur_time,
&freq_data->avg_delta_writes);
freq_data->last_write_time = cur_time;
} else {
freq_data->nr_reads += 1;
- hot_rw_freq_calc(freq_data->last_read_time,
+ root->hot_type->ops.hot_rw_freq_calc_fn(
freq_data->last_read_time,
cur_time,
&freq_data->avg_delta_reads);
@@ -421,7 +426,7 @@ static void hot_map_update(struct hot_freq_data *freq_data,
struct hot_comm_item *comm_item;
struct hot_inode_item *he;
struct hot_range_item *hr;
- u32 temp = hot_temp_calc(freq_data);
+ u32 temp = root->hot_type->ops.hot_temp_calc_fn(freq_data);
u8 a_temp = (u8)hot_raw_shift((u64)temp, (32 - HEAT_MAP_BITS), false);
u8 b_temp = (u8)hot_raw_shift((u64)freq_data->last_temp,
(32 - HEAT_MAP_BITS), false);
@@ -494,7 +499,7 @@ static void hot_range_update(struct hot_inode_item *he,
hot_map_update(&hr->hot_range.hot_freq_data, root);
spin_lock(&hr->hot_range.lock);
- obsolete = hot_is_obsolete(
+ obsolete = root->hot_type->ops.hot_is_obsolete_fn(
&hr->hot_range.hot_freq_data);
spin_unlock(&hr->hot_range.lock);
@@ -647,6 +652,7 @@ void hot_update_freqs(struct inode *inode, loff_t start,
struct hot_info *root = inode->i_sb->s_hot_root;
struct hot_inode_item *he;
struct hot_range_item *hr;
+ u64 range_size;
loff_t cur, end;
if (!root || (len == 0))
@@ -659,15 +665,19 @@ void hot_update_freqs(struct inode *inode, loff_t start,
}
spin_lock(&he->hot_inode.lock);
- hot_freq_data_update(&he->hot_inode.hot_freq_data, rw);
+ hot_freq_data_update(root, &he->hot_inode.hot_freq_data, rw);
spin_unlock(&he->hot_inode.lock);
/*
- * Align ranges on RANGE_SIZE boundary
+ * Align ranges on range size boundary
* to prevent proliferation of range structs
*/
- end = (start + len + RANGE_SIZE - 1) >> RANGE_BITS;
- for (cur = (start >> RANGE_BITS); cur < end; cur++) {
+ range_size = hot_raw_shift(1,
+ root->hot_type->range_bits, true);
+ end = hot_raw_shift((start + len + range_size - 1),
+ root->hot_type->range_bits, false);
+ cur = hot_raw_shift(start, root->hot_type->range_bits, false);
+ for (; cur < end; cur++) {
hr = hot_range_item_lookup(he, cur);
if (IS_ERR(hr)) {
WARN(1, "hot_range_item_lookup returns %ld\n",
@@ -677,7 +687,7 @@ void hot_update_freqs(struct inode *inode, loff_t start,
}
spin_lock(&hr->hot_range.lock);
- hot_freq_data_update(&hr->hot_range.hot_freq_data, rw);
+ hot_freq_data_update(root, &hr->hot_range.hot_freq_data, rw);
spin_unlock(&hr->hot_range.lock);
hot_range_item_put(hr);
@@ -705,6 +715,17 @@ int hot_track_init(struct super_block *sb)
hot_inode_tree_init(root);
hot_map_init(root);
+ /* Get hot type for specific FS */
+ root->hot_type = &sb->s_type->hot_type;
+ if (!root->hot_type->ops.hot_rw_freq_calc_fn)
+ root->hot_type->ops.hot_rw_freq_calc_fn = hot_rw_freq_calc;
+ if (!root->hot_type->ops.hot_temp_calc_fn)
+ root->hot_type->ops.hot_temp_calc_fn = hot_temp_calc;
+ if (!root->hot_type->ops.hot_is_obsolete_fn)
+ root->hot_type->ops.hot_is_obsolete_fn = hot_is_obsolete;
+ if (root->hot_type->range_bits == 0)
+ root->hot_type->range_bits = RANGE_BITS;
+
root->update_wq = alloc_workqueue(
"hot_update_wq", WQ_NON_REENTRANT, 0);
if (!root->update_wq) {
diff --git a/fs/hot_tracking.h b/fs/hot_tracking.h
index 96379a6..73d2a3e 100644
--- a/fs/hot_tracking.h
+++ b/fs/hot_tracking.h
@@ -21,7 +21,6 @@
/* size of sub-file ranges */
#define RANGE_BITS 20
-#define RANGE_SIZE (1 << RANGE_BITS)
#define FREQ_POWER 4
/*
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c42dc37..a8cb14e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1821,6 +1821,7 @@ struct file_system_type {
struct dentry *(*mount) (struct file_system_type *, int,
const char *, void *);
void (*kill_sb) (struct super_block *);
+ struct hot_type hot_type;
struct module *owner;
struct file_system_type * next;
struct hlist_head fs_supers;
diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h
index 1feead2..003af47 100644
--- a/include/linux/hot_tracking.h
+++ b/include/linux/hot_tracking.h
@@ -79,6 +79,24 @@ struct hot_range_item {
size_t len; /* length in bytes */
};
+typedef void (hot_rw_freq_calc_fn) (struct timespec old_atime,
+ struct timespec cur_time, u64 *avg);
+typedef u32 (hot_temp_calc_fn) (struct hot_freq_data *freq_data);
+typedef bool (hot_is_obsolete_fn) (struct hot_freq_data *freq_data);
+
+struct hot_func_ops {
+ hot_rw_freq_calc_fn *hot_rw_freq_calc_fn;
+ hot_temp_calc_fn *hot_temp_calc_fn;
+ hot_is_obsolete_fn *hot_is_obsolete_fn;
+};
+
+/* identifies an hot type */
+struct hot_type {
+ u64 range_bits;
+ /* fields provided by specific FS */
+ struct hot_func_ops ops;
+};
+
struct hot_info {
struct hot_rb_tree hot_inode_tree;
spinlock_t lock; /*protect inode tree */
@@ -91,6 +109,7 @@ struct hot_info {
struct workqueue_struct *update_wq;
struct delayed_work update_work;
+ struct hot_type *hot_type;
};
extern void __init hot_cache_init(void);
--
1.7.6.5
--
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