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Date: Tue, 14 May 2013 08:59:44 +0800
From: zwu.kernel@...il.com
To: viro@...iv.linux.org.uk
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-btrfs@...r.kernel.org, sekharan@...ibm.com,
linuxram@...ibm.com, david@...morbit.com, dsterba@...e.cz,
gregkh@...uxfoundation.org, paulmck@...ux.vnet.ibm.com,
chris.mason@...ionio.com, Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: [PATCH v2 12/12] VFS hot tracking: add fs hot type support
From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Introduce one ability to enable that specific FS
can register its own hot tracking functions.
Signed-off-by: Chandra Seetharaman <sekharan@...ibm.com>
Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
---
fs/hot_tracking.c | 32 ++++++++++++++++++++++----------
fs/hot_tracking.h | 19 +++++++++++++++++++
fs/ioctl.c | 2 +-
include/linux/fs.h | 1 +
include/linux/hot_tracking.h | 22 +++++++++++++++++++++-
5 files changed, 64 insertions(+), 12 deletions(-)
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index 088e9aa..4eee33c 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -51,7 +51,7 @@ static void hot_range_item_init(struct hot_range_item *hr,
struct hot_inode_item *he, loff_t start)
{
hr->start = start;
- hr->len = hot_shift(1, RANGE_BITS, true);
+ hr->len = hot_shift(1, he->hot_root->hot_type->range_bits, true);
hr->hot_inode = he;
hr->storage_type = -1;
hot_comm_item_init(&hr->hot_range, TYPE_RANGE);
@@ -259,10 +259,11 @@ struct hot_range_item
{
struct rb_node **p;
struct rb_node *parent = NULL;
+ struct hot_info *root = he->hot_root;
struct hot_comm_item *ci;
struct hot_range_item *hr, *hr_new = NULL;
- start = hot_shift(start, RANGE_BITS, true);
+ start = hot_shift(start, root->hot_type->range_bits, true);
/* walk tree to find insertion point */
redo:
@@ -350,13 +351,13 @@ static void hot_freq_update(struct hot_info *root,
if (write) {
freq_data->nr_writes += 1;
- hot_freq_calc(freq_data->last_write_time,
+ HOT_FREQ_CALC(root, 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_freq_calc(freq_data->last_read_time,
+ HOT_FREQ_CALC(root, freq_data->last_read_time,
cur_time,
&freq_data->avg_delta_reads);
freq_data->last_read_time = cur_time;
@@ -381,7 +382,7 @@ static void hot_freq_update(struct hot_info *root,
* the *_COEFF_POWER values and combined to a single temperature
* value.
*/
-u32 hot_temp_calc(struct hot_comm_item *ci)
+static u32 hot_temp_calc(struct hot_comm_item *ci)
{
u32 result = 0;
struct hot_freq_data *freq_data = &ci->hot_freq_data;
@@ -501,7 +502,7 @@ static void hot_comm_item_link_cb(struct rcu_head *head)
static int hot_map_update(struct hot_info *root,
struct hot_comm_item *ci)
{
- u32 temp = hot_temp_calc(ci);
+ u32 temp = HOT_TEMP_CALC(root, ci);
u8 cur_temp, prev_temp;
int flag = false;
@@ -564,7 +565,7 @@ static void hot_range_update(struct hot_inode_item *he,
hot_map_update(root, ci)) {
continue;
}
- obsolete = hot_is_obsolete(ci);
+ obsolete = HOT_IS_OBSOLETE(root, ci);
if (obsolete)
hot_comm_item_unlink(root, ci);
}
@@ -1167,10 +1168,10 @@ void hot_update_freqs(struct inode *inode, loff_t start,
* Align ranges on range size boundary
* to prevent proliferation of range structs
*/
- range_size = hot_shift(1, RANGE_BITS, true);
+ range_size = hot_shift(1, root->hot_type->range_bits, true);
end = hot_shift((start + len + range_size - 1),
- RANGE_BITS, false);
- cur = hot_shift(start, RANGE_BITS, false);
+ root->hot_type->range_bits, false);
+ cur = hot_shift(start, root->hot_type->range_bits, false);
for (; cur < end; cur++) {
hr = hot_range_item_lookup(he, cur, 1);
if (IS_ERR(hr)) {
@@ -1211,6 +1212,17 @@ static struct hot_info *hot_tree_init(struct super_block *sb)
INIT_LIST_HEAD(&root->hot_map[j][i]);
}
+ /* Get hot type for specific FS */
+ root->hot_type = &sb->s_type->hot_type;
+ if (!HOT_FREQ_FN_EXIST(root))
+ SET_HOT_FREQ_FN(root, hot_freq_calc);
+ if (!HOT_TEMP_FN_EXIST(root))
+ SET_HOT_TEMP_FN(root, hot_temp_calc);
+ if (!HOT_OBSOLETE_FN_EXIST(root))
+ SET_HOT_OBSOLETE_FN(root, 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 d1ab48b..4756fc3 100644
--- a/fs/hot_tracking.h
+++ b/fs/hot_tracking.h
@@ -40,6 +40,25 @@
#define AVW_DIVIDER_POWER 40 /* AVW - average delta between recent writes(ns) */
#define AVW_COEFF_POWER 0
+#define HOT_FREQ_FN_EXIST(root) \
+ ((root)->hot_type->ops.hot_freq_calc)
+#define HOT_TEMP_FN_EXIST(root) \
+ ((root)->hot_type->ops.hot_temp_calc)
+#define HOT_OBSOLETE_FN_EXIST(root) \
+ ((root)->hot_type->ops.hot_is_obsolete)
+
+#define HOT_FREQ_CALC(root, lt, ct, avg) \
+ ((root)->hot_type->ops.hot_freq_calc(lt, ct, avg))
+#define HOT_IS_OBSOLETE(root, ci) \
+ ((root)->hot_type->ops.hot_is_obsolete(ci))
+
+#define SET_HOT_FREQ_FN(root, fn) \
+ (root)->hot_type->ops.hot_freq_calc = fn
+#define SET_HOT_TEMP_FN(root, fn) \
+ (root)->hot_type->ops.hot_temp_calc = fn
+#define SET_HOT_OBSOLETE_FN(root, fn) \
+ (root)->hot_type->ops.hot_is_obsolete = fn
+
struct hot_debugfs {
const char *name;
const struct file_operations *fops;
diff --git a/fs/ioctl.c b/fs/ioctl.c
index f9f3497..95ec029 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -585,7 +585,7 @@ static int ioctl_heat_info(struct file *file, void __user *argp)
* got a request for live temperature,
* call hot_calc_temp() to recalculate
*/
- heat_info.temp = hot_temp_calc(&he->hot_inode);
+ heat_info.temp = HOT_TEMP_CALC(he->hot_root, &he->hot_inode);
} else {
/* not live temperature, get it from the map list */
heat_info.temp = he->hot_inode.hot_freq_data.last_temp;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index ee2c54f..dda3b9c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1817,6 +1817,7 @@ 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 6de7153..6184296 100644
--- a/include/linux/hot_tracking.h
+++ b/include/linux/hot_tracking.h
@@ -97,6 +97,26 @@ struct hot_range_item {
int storage_type; /* type of storage */
};
+typedef void (hot_freq_calc_fn) (struct timespec old_atime,
+ struct timespec cur_time, u64 *avg);
+typedef u32 (hot_temp_calc_fn) (struct hot_comm_item *ci);
+typedef bool (hot_is_obsolete_fn) (struct hot_comm_item *ci);
+
+struct hot_func_ops {
+ hot_freq_calc_fn *hot_freq_calc;
+ hot_temp_calc_fn *hot_temp_calc;
+ hot_is_obsolete_fn *hot_is_obsolete;
+};
+
+/* identifies an hot type */
+struct hot_type {
+ u64 range_bits;
+ struct hot_func_ops ops; /* fields provided by specific FS */
+};
+
+#define HOT_TEMP_CALC(root, ci) \
+ ((root)->hot_type->ops.hot_temp_calc(ci))
+
struct hot_info {
struct rb_root hot_inode_tree;
spinlock_t t_lock; /* protect above tree */
@@ -105,6 +125,7 @@ struct hot_info {
atomic_t hot_map_nr;
struct workqueue_struct *update_wq;
struct delayed_work update_work;
+ struct hot_type *hot_type;
struct shrinker hot_shrink;
struct dentry *debugfs_dentry;
};
@@ -135,7 +156,6 @@ extern struct hot_inode_item *hot_inode_item_lookup(struct hot_info *root,
extern struct hot_range_item *hot_range_item_lookup(struct hot_inode_item *he,
loff_t start, int alloc);
extern void hot_inode_item_delete(struct inode *inode);
-extern u32 hot_temp_calc(struct hot_comm_item *ci);
static inline u64 hot_shift(u64 counter, u32 bits, bool dir)
{
--
1.7.11.7
--
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