Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755637Ab2JJKMc (ORCPT ); Wed, 10 Oct 2012 06:12:32 -0400 Received: from e32.co.us.ibm.com ([32.97.110.150]:34462 "EHLO e32.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755147Ab2JJKIq (ORCPT ); Wed, 10 Oct 2012 06:08:46 -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, dave@jikos.cz, tytso@mit.edu, cmm@us.ibm.com, Zhi Yong Wu Subject: [RFC v3 05/13] vfs: add two map arrays Date: Wed, 10 Oct 2012 18:07:27 +0800 Message-Id: <1349863655-29320-6-git-send-email-zwu.kernel@gmail.com> X-Mailer: git-send-email 1.7.6.5 In-Reply-To: <1349863655-29320-1-git-send-email-zwu.kernel@gmail.com> References: <1349863655-29320-1-git-send-email-zwu.kernel@gmail.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12101010-5406-0000-0000-000000F82D1E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5510 Lines: 172 From: Zhi Yong Wu Adds two map arrays which contains a lot of list and is used to efficiently look up the data temperature of a file or its ranges. In each list of map arrays, the array node will keep track of temperature info. Signed-off-by: Zhi Yong Wu --- fs/hot_tracking.c | 50 ++++++++++++++++++++++++++++++++++++++++++ include/linux/hot_tracking.h | 16 +++++++++++++ 2 files changed, 66 insertions(+), 0 deletions(-) diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c index 86c87c7..08c42c5 100644 --- a/fs/hot_tracking.c +++ b/fs/hot_tracking.c @@ -60,6 +60,7 @@ static void hot_range_item_init(struct hot_range_item *hr, u32 start, hr->hot_inode = he; kref_init(&hr->hot_range.refs); spin_lock_init(&hr->hot_range.lock); + INIT_LIST_HEAD(&hr->hot_range.n_list); hr->hot_range.hot_freq_data.avg_delta_reads = (u64) -1; hr->hot_range.hot_freq_data.avg_delta_writes = (u64) -1; hr->hot_range.hot_freq_data.flags = FREQ_DATA_TYPE_RANGE; @@ -77,6 +78,7 @@ static void hot_inode_item_init(struct hot_inode_item *he, u64 ino, he->hot_inode_tree = hot_inode_tree; kref_init(&he->hot_inode.refs); spin_lock_init(&he->hot_inode.lock); + INIT_LIST_HEAD(&he->hot_inode.n_list); he->hot_inode.hot_freq_data.avg_delta_reads = (u64) -1; he->hot_inode.hot_freq_data.avg_delta_writes = (u64) -1; he->hot_inode.hot_freq_data.flags = FREQ_DATA_TYPE_INODE; @@ -90,6 +92,11 @@ static void hot_range_item_free(struct kref *kref) struct hot_range_item *hr = container_of(comm_item, struct hot_range_item, hot_range); + spin_lock(&hr->hot_range.lock); + if (!list_empty(&hr->hot_range.n_list)) + list_del_init(&hr->hot_range.n_list); + spin_unlock(&hr->hot_range.lock); + radix_tree_delete(&hr->hot_inode->hot_range_tree, hr->start); kmem_cache_free(hot_range_item_cachep, hr); } @@ -135,6 +142,11 @@ static void hot_inode_item_free(struct kref *kref) struct hot_inode_item *he = container_of(comm_item, struct hot_inode_item, hot_inode); + spin_lock(&he->hot_inode.lock); + if (!list_empty(&he->hot_inode.n_list)) + list_del_init(&he->hot_inode.n_list); + spin_unlock(&he->hot_inode.lock); + hot_range_tree_free(he); radix_tree_delete(he->hot_inode_tree, he->i_ino); kmem_cache_free(hot_inode_item_cachep, he); @@ -365,6 +377,42 @@ inline void hot_update_freqs(struct hot_info *root, } /* + * Initialize inode and range map arrays. + */ +static void hot_map_array_init(struct hot_info *root) +{ + int i; + for (i = 0; i < HEAT_MAP_SIZE; i++) { + INIT_LIST_HEAD(&root->heat_inode_map[i].node_list); + INIT_LIST_HEAD(&root->heat_range_map[i].node_list); + root->heat_inode_map[i].temperature = i; + root->heat_range_map[i].temperature = i; + } +} + +static void hot_map_list_free(struct list_head *node_list) +{ + struct list_head *pos, *next; + struct hot_comm_item *node; + + list_for_each_safe(pos, next, node_list) { + node = list_entry(pos, struct hot_comm_item, n_list); + list_del_init(&node->n_list); + } + +} + +/* Free inode and range map arrays */ +static void hot_map_array_exit(struct hot_info *root) +{ + int i; + for (i = 0; i < HEAT_MAP_SIZE; i++) { + hot_map_list_free(&root->heat_inode_map[i].node_list); + hot_map_list_free(&root->heat_range_map[i].node_list); + } +} + +/* * Initialize kmem cache for hot_inode_item and hot_range_item. */ static int __init hot_cache_init(void) @@ -426,6 +474,7 @@ void hot_track_init(struct super_block *sb) global_hot_tracking_info = root; sb->hot_flags |= MS_HOT_TRACKING; hot_inode_tree_init(root); + hot_map_array_init(root); printk(KERN_INFO "vfs: turning on hot data tracking\n"); @@ -439,6 +488,7 @@ void hot_track_exit(struct super_block *sb) { struct hot_info *root = global_hot_tracking_info; + hot_map_array_exit(root); hot_inode_tree_exit(root); sb->hot_flags &= ~MS_HOT_TRACKING; hot_cache_exit(); diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h index 1e0aed5..7114179 100644 --- a/include/linux/hot_tracking.h +++ b/include/linux/hot_tracking.h @@ -22,6 +22,9 @@ #define MS_HOT_TRACKING (1<<0) +#define HEAT_MAP_BITS 8 +#define HEAT_MAP_SIZE (1 << HEAT_MAP_BITS) + /* * A frequency data struct holds values that are used to * determine temperature of files and file ranges. These structs @@ -38,11 +41,18 @@ struct hot_freq_data { u32 last_temperature; }; +/* List heads in hot map array */ +struct hot_map_head { + struct list_head node_list; + u32 temperature; +}; + /* The common info for both following structures */ struct hot_comm_item { struct hot_freq_data hot_freq_data; /* frequency data */ spinlock_t lock; /* protects object data */ struct kref refs; /* prevents kfree */ + struct list_head n_list; /* list node index */ }; /* An item representing an inode and its access frequency */ @@ -68,6 +78,12 @@ struct hot_range_item { struct hot_info { struct radix_tree_root hot_inode_tree; spinlock_t lock; /*protect inode tree */ + + /* map of inode temperature */ + struct hot_map_head heat_inode_map[HEAT_MAP_SIZE]; + + /* map of range temperature */ + struct hot_map_head heat_range_map[HEAT_MAP_SIZE]; }; extern struct hot_info *global_hot_tracking_info; -- 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/