From: Zhi Yong Wu <wu...@linux.vnet.ibm.com>
Signed-off-by: Zhi Yong Wu <wu...@linux.vnet.ibm.com>
---
fs/hot_tracking.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
fs/hot_tracking.h | 6 ++++++
2 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index 6a5ef53..45d0164 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -388,6 +388,24 @@ static u32 hot_temp_calc(struct hot_freq_data *freq_data)
return result;
}
+static bool hot_is_obsolete(struct hot_freq_data *freq_data)
+{
+ int ret = 0;
+ struct timespec ckt = current_kernel_time();
+
+ u64 cur_time = timespec_to_ns(&ckt);
+ u64 last_read_ns =
+ (cur_time - timespec_to_ns(&freq_data->last_read_time));
+ u64 last_write_ns =
+ (cur_time - timespec_to_ns(&freq_data->last_write_time));
+ u64 kick_ns = TIME_TO_KICK * NSEC_PER_SEC;
+
+ if ((last_read_ns > kick_ns) && (last_write_ns > kick_ns))
+ ret = 1;
+
+ return ret;
+}
+
/*
* Calculate a new temperature and, if necessary,
* move the list_head corresponding to this inode or range
@@ -455,6 +473,37 @@ static void hot_map_update(struct hot_freq_data *freq_data,
}
}
+/* Update temperatures for each range item for aging purposes */
+static void hot_range_update(struct hot_inode_item *he,
+ struct hot_info *root)
+{
+ struct rb_node *node;
+ struct hot_comm_item *ci;
+ struct hot_range_item *hr;
+ bool obsolete;
+
+ spin_lock(&he->lock);
+ node = rb_first(&he->hot_range_tree.map);
+ while (node) {
+ ci = rb_entry(node, struct hot_comm_item, rb_node);
+ hr = container_of(ci, struct hot_range_item, hot_range);
+ kref_get(&hr->hot_range.refs);
+ hot_map_update(&hr->hot_range.hot_freq_data, root);
+
+ spin_lock(&hr->hot_range.lock);
+ obsolete = hot_is_obsolete(
+ &hr->hot_range.hot_freq_data);
+ spin_unlock(&hr->hot_range.lock);
+
+ node = rb_next(node);
+
+ hot_range_item_put(hr);
+ if (obsolete)
+ hot_range_item_put(hr);
+ }
+ spin_unlock(&he->lock);
+}
+
/*
* Initialize inode and range map info.
*/
diff --git a/fs/hot_tracking.h b/fs/hot_tracking.h
index f33066f..46d068a 100644
--- a/fs/hot_tracking.h
+++ b/fs/hot_tracking.h
@@ -24,6 +24,12 @@
#define RANGE_SIZE (1 << RANGE_BITS)
#define FREQ_POWER 4
+/*
+ * time to quit keeping track of
+ * tracking data (seconds)
+ */
+#define TIME_TO_KICK 300
+
/* NRR/NRW heat unit = 2^X accesses */
#define NRR_MULTIPLIER_POWER 20 /* NRR - number of reads since mount */
#define NRR_COEFF_POWER 0
--
1.7.6.5
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