From: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>
Add two proc files hot-kick-time and hot-update-delay
under the dir /proc/sys/fs/ in order to turn
TIME_TO_KICK and HEAT_UPDATE_DELAY into be tunable.
Signed-off-by: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>
---
fs/hot_tracking.c | 12 +++++++++---
fs/hot_tracking.h | 9 ---------
include/linux/hot_tracking.h | 7 +++++++
kernel/sysctl.c | 14 ++++++++++++++
4 files changed, 30 insertions(+), 12 deletions(-)
diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index db430e8..2e5bf6c 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -27,6 +27,12 @@
static struct dentry *hot_debugfs_root;
+int sysctl_hot_kick_time __read_mostly = 300;
+EXPORT_SYMBOL_GPL(sysctl_hot_kick_time);
+
+int sysctl_hot_update_delay __read_mostly = 300;
+EXPORT_SYMBOL_GPL(sysctl_hot_update_delay);
+
/* 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;
@@ -413,7 +419,7 @@ static bool hot_is_obsolete(struct hot_freq_data *freq_data)
(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;
+ u64 kick_ns = sysctl_hot_kick_time * NSEC_PER_SEC;
if ((last_read_ns > kick_ns) && (last_write_ns > kick_ns))
ret = 1;
@@ -622,7 +628,7 @@ 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(HEAT_UPDATE_DELAY * MSEC_PER_SEC));
+ msecs_to_jiffies(sysctl_hot_update_delay * MSEC_PER_SEC));
}
/*
@@ -1270,7 +1276,7 @@ int hot_track_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(HEAT_UPDATE_DELAY * MSEC_PER_SEC));
+ msecs_to_jiffies(sysctl_hot_update_delay * 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 1a445a6..50c5681 100644
--- a/fs/hot_tracking.h
+++ b/fs/hot_tracking.h
@@ -24,15 +24,6 @@
#define RANGE_BITS 20
#define FREQ_POWER 4
-/*
- * time to quit keeping track of
- * tracking data (seconds)
- */
-#define TIME_TO_KICK 300
-
-/* set how often to update temperatures (seconds) */
-#define HEAT_UPDATE_DELAY 300
-
/* NRR/NRW heat unit = 2^X accesses */
#define NRR_MULTIPLIER_POWER 20 /* NRR - number of reads since mount */
#define NRR_COEFF_POWER 0
diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h
index d9a49f9..96c91e3 100644
--- a/include/linux/hot_tracking.h
+++ b/include/linux/hot_tracking.h
@@ -120,6 +120,13 @@ 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_kick_time, sysctl_hot_update_delay;
+
+/*
* Hot data tracking ioctls:
*
* HOT_INFO - retrieve info on frequency of access
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 26f65ea..37624fb 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1545,6 +1545,20 @@ static struct ctl_table fs_table[] = {
.proc_handler = &pipe_proc_fn,
.extra1 = &pipe_min_size,
},
+ {
+ .procname = "hot-kick-time",
+ .data = &sysctl_hot_kick_time,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "hot-update-delay",
+ .data = &sysctl_hot_update_delay,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
{ }
};
--
1.7.6.5
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