From: Zhi Yong Wu <wu...@linux.vnet.ibm.com>
Add two proc interfaces hot-age-interval and hot-update-interval
under the dir /proc/sys/fs/ in order to turn HOT_AGE_INTERVAL and
HOT_UPDATE_INTERVAL into be tunable.
Signed-off-by: Chandra Seetharaman <sekha...@us.ibm.com>
Signed-off-by: Zhi Yong Wu <wu...@linux.vnet.ibm.com>
---
fs/hot_tracking.c | 12 +++++++++---
fs/hot_tracking.h | 3 ---
include/linux/hot_tracking.h | 7 +++++++
kernel/sysctl.c | 14 ++++++++++++++
4 files changed, 30 insertions(+), 6 deletions(-)
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index 1618f21..088e9aa 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -23,6 +23,12 @@
static struct dentry *hot_debugfs_root;
+int sysctl_hot_age_interval __read_mostly = 300;
+EXPORT_SYMBOL_GPL(sysctl_hot_age_interval);
+
+int sysctl_hot_update_interval __read_mostly = 300;
+EXPORT_SYMBOL_GPL(sysctl_hot_update_interval);
+
/* 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;
@@ -446,7 +452,7 @@ static bool hot_is_obsolete(struct hot_comm_item *ci)
struct hot_freq_data *freq_data = &ci->hot_freq_data;
u64 last_read_ns, last_write_ns;
u64 cur_time = timespec_to_ns(&ckt);
- u64 kick_ns = HOT_AGE_INTERVAL * NSEC_PER_SEC;
+ u64 kick_ns = sysctl_hot_age_interval * NSEC_PER_SEC;
last_read_ns =
(cur_time - timespec_to_ns(&freq_data->last_read_time));
@@ -623,7 +629,7 @@ static void hot_update_worker(struct work_struct *work)
/* Instert next delayed work */
queue_delayed_work(root->update_wq, &root->update_work,
- msecs_to_jiffies(HOT_UPDATE_INTERVAL * MSEC_PER_SEC));
+ msecs_to_jiffies(sysctl_hot_update_interval * MSEC_PER_SEC));
}
static void *hot_range_seq_start(struct seq_file *seq, loff_t *pos)
@@ -1217,7 +1223,7 @@ static struct hot_info *hot_tree_init(struct super_block
*sb)
/* Initialize hot tracking wq and arm one delayed work */
INIT_DELAYED_WORK(&root->update_work, hot_update_worker);
queue_delayed_work(root->update_wq, &root->update_work,
- msecs_to_jiffies(HOT_UPDATE_INTERVAL * MSEC_PER_SEC));
+ msecs_to_jiffies(sysctl_hot_update_interval * MSEC_PER_SEC));
/* Register a shrinker callback */
root->hot_shrink.shrink = hot_track_prune;
diff --git a/fs/hot_tracking.h b/fs/hot_tracking.h
index fcc60ac..d1ab48b 100644
--- a/fs/hot_tracking.h
+++ b/fs/hot_tracking.h
@@ -15,9 +15,6 @@
#include <linux/workqueue.h>
#include <linux/hot_tracking.h>
-#define HOT_UPDATE_INTERVAL 150
-#define HOT_AGE_INTERVAL 300
-
/* size of sub-file ranges */
#define RANGE_BITS 20
#define FREQ_POWER 4
diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h
index 263a15e..6de7153 100644
--- a/include/linux/hot_tracking.h
+++ b/include/linux/hot_tracking.h
@@ -110,6 +110,13 @@ struct hot_info {
};
/*
+ * Two variables have meanings as below:
+ * 1. time to quit keeping track of tracking data (seconds)
+ * 2. set how often to update temperatures (seconds)
+ */
+extern int sysctl_hot_age_interval, sysctl_hot_update_interval;
+
+/*
* Hot data tracking ioctls:
*
* HOT_INFO - retrieve info on frequency of access
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 9edcf45..6ee4338 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1616,6 +1616,20 @@ static struct ctl_table fs_table[] = {
.proc_handler = &pipe_proc_fn,
.extra1 = &pipe_min_size,
},
+ {
+ .procname = "hot-age-interval",
+ .data = &sysctl_hot_age_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "hot-update-interval",
+ .data = &sysctl_hot_update_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
{ }
};
--
1.7.11.7
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