From: zwu.kernel@gmail.com Subject: [RFC v4+ hot_track 15/19] sysfs: add two hot_track proc files Date: Mon, 29 Oct 2012 12:30:57 +0800 Message-ID: <1351485061-12297-16-git-send-email-zwu.kernel@gmail.com> References: <1351485061-12297-1-git-send-email-zwu.kernel@gmail.com> Cc: linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linuxram@linux.vnet.ibm.com, viro@zeniv.linux.org.uk, david@fromorbit.com, tytso@mit.edu, cmm@us.ibm.com, wuzhy@linux.vnet.ibm.com, wenqing.lz@taobao.com To: linux-fsdevel@vger.kernel.org Return-path: In-Reply-To: <1351485061-12297-1-git-send-email-zwu.kernel@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org From: Zhi Yong Wu 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 --- 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 376d7fb..02ac4a2 100644 --- a/fs/hot_tracking.c +++ b/fs/hot_tracking.c @@ -28,6 +28,12 @@ static DEFINE_SPINLOCK(hot_func_list_lock); static LIST_HEAD(hot_func_list); +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; @@ -417,7 +423,7 @@ 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; @@ -625,7 +631,7 @@ 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)); } /* @@ -1316,7 +1322,7 @@ 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 f5ba2d6..095eab0 100644 --- a/fs/hot_tracking.h +++ b/fs/hot_tracking.h @@ -26,15 +26,6 @@ #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 a16217f..416c988 100644 --- a/include/linux/hot_tracking.h +++ b/include/linux/hot_tracking.h @@ -123,6 +123,13 @@ 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