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Date: Mon, 29 Oct 2012 12:30:52 +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, wuzhy@...ux.vnet.ibm.com, wenqing.lz@...bao.com
Subject: [RFC v4+ hot_track 10/19] vfs: introduce hot func register framework
From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Introduce one framwork to enable that specific FS
can register its own hot tracking functions.
Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
---
fs/hot_tracking.c | 78 ++++++++++++++++++++++++++++++++++++++----
include/linux/hot_tracking.h | 25 +++++++++++++
2 files changed, 96 insertions(+), 7 deletions(-)
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index 0ef9cad..c6c6138 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -24,6 +24,9 @@
#include <linux/limits.h>
#include "hot_tracking.h"
+static DEFINE_SPINLOCK(hot_func_list_lock);
+static LIST_HEAD(hot_func_list);
+
/* 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;
@@ -305,20 +308,23 @@ static u64 hot_average_update(struct timespec old_atime,
return new_avg;
}
-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;
- freq_data->avg_delta_writes = hot_average_update(
+ freq_data->avg_delta_writes =
+ root->hot_func_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;
- freq_data->avg_delta_reads = hot_average_update(
+ freq_data->avg_delta_reads =
+ root->hot_func_type->ops.hot_rw_freq_calc_fn(
freq_data->last_read_time,
cur_time,
freq_data->avg_delta_reads);
@@ -430,7 +436,7 @@ static void hot_map_array_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_func_type->ops.hot_temp_calc_fn(freq_data);
u8 a_temp = temp >> (32 - HEAT_MAP_BITS);
u8 b_temp = freq_data->last_temp >> (32 - HEAT_MAP_BITS);
@@ -511,7 +517,7 @@ static void hot_range_update(struct hot_inode_item *he,
&hr_nodes[i]->hot_range.hot_freq_data, root);
spin_lock(&hr_nodes[i]->hot_range.lock);
- obsolete = hot_is_obsolete(
+ obsolete = root->hot_func_type->ops.hot_is_obsolete_fn(
&hr_nodes[i]->hot_range.hot_freq_data);
spin_unlock(&hr_nodes[i]->hot_range.lock);
@@ -668,7 +674,7 @@ void hot_update_freqs(struct inode *inode, u64 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);
/*
@@ -685,7 +691,7 @@ void hot_update_freqs(struct inode *inode, u64 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);
@@ -695,6 +701,61 @@ void hot_update_freqs(struct inode *inode, u64 start,
}
EXPORT_SYMBOL_GPL(hot_update_freqs);
+static struct hot_func_type hot_func_def = {
+ .hot_func_name = "hot_type_def",
+ .ops = {
+ .hot_rw_freq_calc_fn = hot_average_update,
+ .hot_temp_calc_fn = hot_temp_calc,
+ .hot_is_obsolete_fn = hot_is_obsolete,
+ },
+};
+
+static struct hot_func_type *hot_func_get(const char *name)
+{
+ struct hot_func_type *f, *h = &hot_func_def;
+
+ spin_lock(&hot_func_list_lock);
+ list_for_each_entry(f, &hot_func_list, list) {
+ if (!strcmp(f->hot_func_name, name))
+ h = f;
+ }
+ spin_unlock(&hot_func_list_lock);
+
+ return h;
+}
+
+int hot_func_register(struct hot_func_type *h)
+{
+ struct hot_func_type *f, *t = NULL;
+
+ /* register, don't allow duplicate names */
+ spin_lock(&hot_func_list_lock);
+ list_for_each_entry(f, &hot_func_list, list) {
+ if (!strcmp(f->hot_func_name, h->hot_func_name))
+ t = f;
+ }
+
+ if (t) {
+ spin_unlock(&hot_func_list_lock);
+ return -EBUSY;
+ }
+
+ list_add_tail(&h->list, &hot_func_list);
+ spin_unlock(&hot_func_list_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(hot_func_register);
+
+void hot_func_unregister(struct hot_func_type *h)
+{
+ /* unregister */
+ spin_lock(&hot_func_list_lock);
+ list_del_init(&h->list);
+ spin_unlock(&hot_func_list_lock);
+}
+EXPORT_SYMBOL_GPL(hot_func_unregister);
+
/*
* Initialize the data structures for hot data tracking.
*/
@@ -714,6 +775,9 @@ int hot_track_init(struct super_block *sb)
hot_inode_tree_init(root);
hot_map_array_init(root);
+ /* Get hot func type */
+ root->hot_func_type = hot_func_get(sb->s_type->name);
+
root->update_wq = alloc_workqueue(
"hot_update_wq", WQ_NON_REENTRANT, 0);
if (!root->update_wq) {
diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h
index 2ee0d02..3941052 100644
--- a/include/linux/hot_tracking.h
+++ b/include/linux/hot_tracking.h
@@ -23,6 +23,8 @@
#define HEAT_MAP_BITS 8
#define HEAT_MAP_SIZE (1 << HEAT_MAP_BITS)
+#define HOT_NAME_MAX 16
+
/*
* A frequency data struct holds values that are used to
* determine temperature of files and file ranges. These structs
@@ -73,6 +75,25 @@ struct hot_range_item {
u32 len; /* length in bytes */
};
+typedef u64 (hot_rw_freq_calc_fn) (struct timespec old_atime,
+ struct timespec cur_time, u64 old_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 func type */
+struct hot_func_type {
+ char hot_func_name[HOT_NAME_MAX];
+ /* fields provided by specific FS */
+ struct hot_func_ops ops;
+ struct list_head list;
+};
+
struct hot_info {
struct radix_tree_root hot_inode_tree;
spinlock_t lock; /*protect inode tree */
@@ -85,6 +106,7 @@ struct hot_info {
struct workqueue_struct *update_wq;
struct delayed_work update_work;
+ struct hot_func_type *hot_func_type;
};
extern void __init hot_cache_init(void);
@@ -93,4 +115,7 @@ extern void hot_track_exit(struct super_block *sb);
extern void hot_update_freqs(struct inode *inode, u64 start,
u64 len, int rw);
+extern int hot_func_register(struct hot_func_type *h);
+extern void hot_func_unregister(struct hot_func_type *h);
+
#endif /* _LINUX_HOTTRACK_H */
--
1.7.6.5
--
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