From: Zhi Yong Wu <[email protected]> Add a /proc interface hot-update-interval under the dir /proc/sys/fs/ in order to turn HOT_UPDATE_INTERVAL into a tunable parameter.
Signed-off-by: Chandra Seetharaman <[email protected]> Signed-off-by: Zhi Yong Wu <[email protected]> --- fs/hot_tracking.c | 6 ++++-- fs/hot_tracking.h | 2 -- include/linux/hot_tracking.h | 3 +++ kernel/sysctl.c | 7 +++++++ 4 files changed, 14 insertions(+), 4 deletions(-) diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c index ac0cdda..7a9bd4f 100644 --- a/fs/hot_tracking.c +++ b/fs/hot_tracking.c @@ -15,6 +15,8 @@ #include <linux/sched.h> #include "hot_tracking.h" +int sysctl_hot_update_interval __read_mostly = 150; + /* 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; @@ -556,7 +558,7 @@ 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)); } /* @@ -696,7 +698,7 @@ 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.count_objects = hot_track_shrink_count; diff --git a/fs/hot_tracking.h b/fs/hot_tracking.h index 4a89fdb..6a6971e 100644 --- a/fs/hot_tracking.h +++ b/fs/hot_tracking.h @@ -15,8 +15,6 @@ #include <linux/workqueue.h> #include <linux/hot_tracking.h> -#define HOT_UPDATE_INTERVAL 150 - /* 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 0ee9ca2..43df1b9 100644 --- a/include/linux/hot_tracking.h +++ b/include/linux/hot_tracking.h @@ -85,6 +85,9 @@ struct hot_info { struct shrinker hot_shrink; }; +/* set how often to update temperatures (seconds) */ +extern int sysctl_hot_update_interval; + /* * Hot data tracking ioctls: * diff --git a/kernel/sysctl.c b/kernel/sysctl.c index b2f06f3..e0b062a 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1631,6 +1631,13 @@ static struct ctl_table fs_table[] = { .proc_handler = &pipe_proc_fn, .extra1 = &pipe_min_size, }, + { + .procname = "hot-update-interval", + .data = &sysctl_hot_update_interval, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, { } }; -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
