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Date: Mon, 29 Oct 2012 12:30:49 +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 07/19] vfs: add map info update function
From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
---
fs/hot_tracking.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/hot_tracking.h | 21 +++++++++++++++++
2 files changed, 87 insertions(+), 0 deletions(-)
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index 83e590c..9245dd3 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -398,6 +398,72 @@ static u32 hot_temp_calc(struct hot_freq_data *freq_data)
}
/*
+ * Calculate a new temperature and, if necessary,
+ * move the list_head corresponding to this inode or range
+ * to the proper list with the new temperature
+ */
+static void hot_map_array_update(struct hot_freq_data *freq_data,
+ struct hot_info *root)
+{
+ struct hot_map_head *buckets, *cur_bucket;
+ struct hot_comm_item *comm_item;
+ struct hot_inode_item *he;
+ struct hot_range_item *hr;
+ u32 temp = hot_temp_calc(freq_data);
+ u8 a_temp = temp >> (32 - HEAT_MAP_BITS);
+ u8 b_temp = freq_data->last_temp >> (32 - HEAT_MAP_BITS);
+
+ comm_item = container_of(freq_data,
+ struct hot_comm_item, hot_freq_data);
+
+ if (freq_data->flags & FREQ_DATA_TYPE_INODE) {
+ he = container_of(comm_item,
+ struct hot_inode_item, hot_inode);
+ buckets = root->heat_inode_map;
+
+ if (he == NULL)
+ return;
+
+ spin_lock(&he->hot_inode.lock);
+ if (list_empty(&he->hot_inode.n_list) || (a_temp != b_temp)) {
+ if (!list_empty(&he->hot_inode.n_list)) {
+ list_del_init(&he->hot_inode.n_list);
+ root->hot_map_nr--;
+ }
+
+ cur_bucket = buckets + a_temp;
+ list_add_tail(&he->hot_inode.n_list,
+ &cur_bucket->node_list);
+ root->hot_map_nr++;
+ freq_data->last_temp = temp;
+ }
+ spin_unlock(&he->hot_inode.lock);
+ } else if (freq_data->flags & FREQ_DATA_TYPE_RANGE) {
+ hr = container_of(comm_item,
+ struct hot_range_item, hot_range);
+ buckets = root->heat_range_map;
+
+ if (hr == NULL)
+ return;
+
+ spin_lock(&hr->hot_range.lock);
+ if (list_empty(&hr->hot_range.n_list) || (a_temp != b_temp)) {
+ if (!list_empty(&hr->hot_range.n_list)) {
+ list_del_init(&hr->hot_range.n_list);
+ root->hot_map_nr--;
+ }
+
+ cur_bucket = buckets + a_temp;
+ list_add_tail(&hr->hot_range.n_list,
+ &cur_bucket->node_list);
+ root->hot_map_nr++;
+ freq_data->last_temp = temp;
+ }
+ spin_unlock(&hr->hot_range.lock);
+ }
+}
+
+/*
* Initialize inode and range map arrays.
*/
static void hot_map_array_init(struct hot_info *root)
diff --git a/fs/hot_tracking.h b/fs/hot_tracking.h
index cc4666e..196b894 100644
--- a/fs/hot_tracking.h
+++ b/fs/hot_tracking.h
@@ -26,6 +26,27 @@
#define FREQ_POWER 4
+/* NRR/NRW heat unit = 2^X accesses */
+#define NRR_MULTIPLIER_POWER 20 /* NRR - number of reads since mount */
+#define NRR_COEFF_POWER 0
+#define NRW_MULTIPLIER_POWER 20 /* NRW - number of writes since mount */
+#define NRW_COEFF_POWER 0
+
+/* LTR/LTW heat unit = 2^X ns of age */
+#define LTR_DIVIDER_POWER 30 /* LTR - time elapsed since last read(ns) */
+#define LTR_COEFF_POWER 1
+#define LTW_DIVIDER_POWER 30 /* LTW - time elapsed since last write(ns) */
+#define LTW_COEFF_POWER 1
+
+/*
+ * AVR/AVW cold unit = 2^X ns of average delta
+ * AVR/AVW heat unit = HEAT_MAX_VALUE - cold unit
+ */
+#define AVR_DIVIDER_POWER 40 /* AVR - average delta between recent reads(ns) */
+#define AVR_COEFF_POWER 0
+#define AVW_DIVIDER_POWER 40 /* AVW - average delta between recent writes(ns) */
+#define AVW_COEFF_POWER 0
+
void hot_inode_item_put(struct hot_inode_item *he);
struct hot_inode_item *hot_inode_item_find(struct hot_info *root, u64 ino);
--
1.7.6.5
--
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