Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757349Ab2J2Ecs (ORCPT ); Mon, 29 Oct 2012 00:32:48 -0400 Received: from e8.ny.us.ibm.com ([32.97.182.138]:33973 "EHLO e8.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756695Ab2J2Eco (ORCPT ); Mon, 29 Oct 2012 00:32:44 -0400 From: zwu.kernel@gmail.com To: linux-fsdevel@vger.kernel.org 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 Subject: [RFC v4+ hot_track 09/19] vfs: add one work queue Date: Mon, 29 Oct 2012 12:30:51 +0800 Message-Id: <1351485061-12297-10-git-send-email-zwu.kernel@gmail.com> X-Mailer: git-send-email 1.7.6.5 In-Reply-To: <1351485061-12297-1-git-send-email-zwu.kernel@gmail.com> References: <1351485061-12297-1-git-send-email-zwu.kernel@gmail.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12102904-9360-0000-0000-00000C2822FD Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4801 Lines: 171 From: Zhi Yong Wu Add a per-superblock workqueue and a delayed_work to run periodic work to update map info on each superblock. Signed-off-by: Zhi Yong Wu --- fs/hot_tracking.c | 85 ++++++++++++++++++++++++++++++++++++++++++ fs/hot_tracking.h | 3 + include/linux/hot_tracking.h | 3 + 3 files changed, 91 insertions(+), 0 deletions(-) diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c index fff0038..0ef9cad 100644 --- a/fs/hot_tracking.c +++ b/fs/hot_tracking.c @@ -15,9 +15,12 @@ #include #include #include +#include +#include #include #include #include +#include #include #include "hot_tracking.h" @@ -557,6 +560,67 @@ static void hot_map_array_exit(struct hot_info *root) } } +/* Temperature compare function*/ +static int hot_temp_cmp(void *priv, struct list_head *a, + struct list_head *b) +{ + struct hot_comm_item *ap = + container_of(a, struct hot_comm_item, n_list); + struct hot_comm_item *bp = + container_of(b, struct hot_comm_item, n_list); + + int diff = ap->hot_freq_data.last_temp + - bp->hot_freq_data.last_temp; + if (diff > 0) + return -1; + if (diff < 0) + return 1; + return 0; +} + +/* + * Every sync period we update temperatures for + * each hot inode item and hot range item for aging + * purposes. + */ +static void hot_update_worker(struct work_struct *work) +{ + struct hot_info *root = container_of(to_delayed_work(work), + struct hot_info, update_work); + struct hot_inode_item *hi_nodes[8]; + u64 ino = 0; + int i, n; + + while (1) { + n = radix_tree_gang_lookup(&root->hot_inode_tree, + (void **)hi_nodes, ino, + ARRAY_SIZE(hi_nodes)); + if (!n) + break; + + ino = hi_nodes[n - 1]->i_ino + 1; + for (i = 0; i < n; i++) { + kref_get(&hi_nodes[i]->hot_inode.refs); + hot_map_array_update( + &hi_nodes[i]->hot_inode.hot_freq_data, root); + hot_range_update(hi_nodes[i], root); + hot_inode_item_put(hi_nodes[i]); + } + } + + /* Sort temperature map info */ + for (i = 0; i < HEAT_MAP_SIZE; i++) { + list_sort(NULL, &root->heat_inode_map[i].node_list, + hot_temp_cmp); + list_sort(NULL, &root->heat_range_map[i].node_list, + hot_temp_cmp); + } + + /* Instert next delayed work */ + queue_delayed_work(root->update_wq, &root->update_work, + msecs_to_jiffies(HEAT_UPDATE_DELAY * MSEC_PER_SEC)); +} + /* * Initialize kmem cache for hot_inode_item and hot_range_item. */ @@ -650,9 +714,28 @@ int hot_track_init(struct super_block *sb) hot_inode_tree_init(root); hot_map_array_init(root); + root->update_wq = alloc_workqueue( + "hot_update_wq", WQ_NON_REENTRANT, 0); + if (!root->update_wq) { + printk(KERN_ERR "%s: Failed to create " + "hot update workqueue\n", __func__); + goto failed_wq; + } + + /* 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)); + printk(KERN_INFO "VFS: Turning on hot data tracking\n"); return 0; + +failed_wq: + hot_map_array_exit(root); + hot_inode_tree_exit(root); + kfree(root); + return ret; } EXPORT_SYMBOL_GPL(hot_track_init); @@ -660,6 +743,8 @@ void hot_track_exit(struct super_block *sb) { struct hot_info *root = sb->s_hot_root; + cancel_delayed_work_sync(&root->update_work); + destroy_workqueue(root->update_wq); hot_map_array_exit(root); hot_inode_tree_exit(root); kfree(root); diff --git a/fs/hot_tracking.h b/fs/hot_tracking.h index f5ec05a..92e31fb 100644 --- a/fs/hot_tracking.h +++ b/fs/hot_tracking.h @@ -32,6 +32,9 @@ */ #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 4f92947..2ee0d02 100644 --- a/include/linux/hot_tracking.h +++ b/include/linux/hot_tracking.h @@ -82,6 +82,9 @@ struct hot_info { /* map of range temperature */ struct hot_map_head heat_range_map[HEAT_MAP_SIZE]; unsigned int hot_map_nr; + + struct workqueue_struct *update_wq; + struct delayed_work update_work; }; extern void __init hot_cache_init(void); -- 1.7.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/