From patchwork Thu Oct 25 15:08:56 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhiyong Wu X-Patchwork-Id: 1644871 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 31795DF2AB for ; Thu, 25 Oct 2012 15:11:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946164Ab2JYPKb (ORCPT ); Thu, 25 Oct 2012 11:10:31 -0400 Received: from e33.co.us.ibm.com ([32.97.110.151]:45415 "EHLO e33.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1946128Ab2JYPKY (ORCPT ); Thu, 25 Oct 2012 11:10:24 -0400 Received: from /spool/local by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 25 Oct 2012 09:10:21 -0600 Received: from d03relay05.boulder.ibm.com (d03relay05.boulder.ibm.com [9.17.195.107]) by d03dlp03.boulder.ibm.com (Postfix) with ESMTP id E920C19D8045; Thu, 25 Oct 2012 09:10:17 -0600 (MDT) Received: from d03av04.boulder.ibm.com (d03av04.boulder.ibm.com [9.17.195.170]) by d03relay05.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q9PF9tVP237418; Thu, 25 Oct 2012 09:09:58 -0600 Received: from d03av04.boulder.ibm.com (loopback [127.0.0.1]) by d03av04.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q9PF9qIl016078; Thu, 25 Oct 2012 09:09:52 -0600 Received: from us.ibm.com ([9.115.122.193]) by d03av04.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with SMTP id q9PF9lBw015380; Thu, 25 Oct 2012 09:09:48 -0600 Received: by us.ibm.com (sSMTP sendmail emulation); Thu, 25 Oct 2012 23:09:38 +0800 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, Zhi Yong Wu Subject: [RFC v4 04/15] vfs,hot_track: add two map arrays Date: Thu, 25 Oct 2012 23:08:56 +0800 Message-Id: <1351177747-19389-5-git-send-email-zwu.kernel@gmail.com> X-Mailer: git-send-email 1.7.6.5 In-Reply-To: <1351177747-19389-1-git-send-email-zwu.kernel@gmail.com> References: <1351177747-19389-1-git-send-email-zwu.kernel@gmail.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12102515-2398-0000-0000-00000CD8D4DA X-IBM-ISS-SpamDetectors: X-IBM-ISS-DetailInfo: BY=3.00000294; HX=3.00000198; KW=3.00000007; PH=3.00000001; SC=3.00000008; SDB=6.00185562; UDB=6.00042037; UTC=2012-10-25 15:10:23 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org 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 | 55 ++++++++++++++++++++++++++++++++++++++++++ include/linux/hot_tracking.h | 16 ++++++++++++ 2 files changed, 71 insertions(+), 0 deletions(-) diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c index 201598b..b5568bc 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; @@ -91,6 +92,13 @@ 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); + hot_root->hot_map_nr--; + } + 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 +143,13 @@ 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); + hot_root->hot_map_nr--; + } + 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); @@ -317,6 +332,44 @@ static void hot_freq_data_update(struct hot_freq_data *freq_data, bool write) } /* + * 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].temp = i; + root->heat_range_map[i].temp = i; + } +} + +static void hot_map_list_free(struct list_head *node_list, + struct hot_info *root) +{ + 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); + root->hot_map_nr--; + } + +} + +/* 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, root); + hot_map_list_free(&root->heat_range_map[i].node_list, root); + } +} + +/* * Initialize kmem cache for hot_inode_item and hot_range_item. */ void __init hot_cache_init(void) @@ -406,6 +459,7 @@ int hot_track_init(struct super_block *sb) sb->s_hot_root = hot_root = root; hot_inode_tree_init(root); + hot_map_array_init(root); printk(KERN_INFO "VFS: Turning on hot data tracking\n"); @@ -417,6 +471,7 @@ void hot_track_exit(struct super_block *sb) { struct hot_info *root = sb->s_hot_root; + hot_map_array_exit(root); hot_inode_tree_exit(root); kfree(root); } diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h index de68f66..0ce2ef8 100644 --- a/include/linux/hot_tracking.h +++ b/include/linux/hot_tracking.h @@ -20,6 +20,9 @@ #include #include +#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 @@ -36,11 +39,18 @@ struct hot_freq_data { u32 last_temp; }; +/* List heads in hot map array */ +struct hot_map_head { + struct list_head node_list; + u8 temp; +}; + /* 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 */ @@ -66,6 +76,12 @@ 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]; + unsigned int hot_map_nr; }; void __init hot_cache_init(void);