From patchwork Wed Nov 28 03:11:34 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Su Yue X-Patchwork-Id: 10701737 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 476DE17D5 for ; Wed, 28 Nov 2018 03:04:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 363D5289FA for ; Wed, 28 Nov 2018 03:04:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2A56D2C85C; Wed, 28 Nov 2018 03:04:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C018B289FA for ; Wed, 28 Nov 2018 03:04:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727239AbeK1OER (ORCPT ); Wed, 28 Nov 2018 09:04:17 -0500 Received: from mail.cn.fujitsu.com ([183.91.158.132]:54216 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727115AbeK1OEQ (ORCPT ); Wed, 28 Nov 2018 09:04:16 -0500 X-IronPort-AV: E=Sophos;i="5.56,289,1539619200"; d="scan'208";a="48766237" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 28 Nov 2018 11:04:10 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id 353C54B6AE19 for ; Wed, 28 Nov 2018 11:04:09 +0800 (CST) Received: from localhost.localdomain (10.167.226.22) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.408.0; Wed, 28 Nov 2018 11:04:14 +0800 From: Su Yue To: CC: Subject: [RFC PATCH 03/17] btrfs: priority alloc: introduce compute_block_group_priority/usage Date: Wed, 28 Nov 2018 11:11:34 +0800 Message-ID: <20181128031148.357-4-suy.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181128031148.357-1-suy.fnst@cn.fujitsu.com> References: <20181128031148.357-1-suy.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.22] X-yoursite-MailScanner-ID: 353C54B6AE19.AAEFA X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: suy.fnst@cn.fujitsu.com Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce compute_block_group_usage() and compute_block_group_usage(). And call the latter in btrfs_make_block_group() and btrfs_read_block_groups(). compute_priority_level use ilog2(free) to compute priority level. Signed-off-by: Su Yue --- fs/btrfs/extent-tree.c | 60 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index d242a1174e50..0f4c5b1e0bcc 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -10091,6 +10091,7 @@ static int check_chunk_block_group_mappings(struct btrfs_fs_info *fs_info) return ret; } +static long compute_block_group_priority(struct btrfs_block_group_cache *bg); int btrfs_read_block_groups(struct btrfs_fs_info *info) { struct btrfs_path *path; @@ -10224,6 +10225,8 @@ int btrfs_read_block_groups(struct btrfs_fs_info *info) link_block_group(cache); + cache->priority = compute_block_group_priority(cache); + set_avail_alloc_bits(info, cache->flags); if (btrfs_chunk_readonly(info, cache->key.objectid)) { inc_block_group_ro(cache, 1); @@ -10373,6 +10376,8 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans, u64 bytes_used, link_block_group(cache); + cache->priority = compute_block_group_priority(cache); + list_add_tail(&cache->bg_list, &trans->new_bgs); set_avail_alloc_bits(fs_info, type); @@ -11190,3 +11195,58 @@ void btrfs_mark_bg_unused(struct btrfs_block_group_cache *bg) } spin_unlock(&fs_info->unused_bgs_lock); } + +enum btrfs_priority_shift { + PRIORITY_USAGE_SHIFT = 0 +}; + +static inline u8 +compute_block_group_usage(struct btrfs_block_group_cache *cache) +{ + u64 num_bytes; + u8 usage; + + num_bytes = cache->reserved + cache->bytes_super + + btrfs_block_group_used(&cache->item); + + usage = div_u64(num_bytes, div_factor_fine(cache->key.offset, 1)); + + return usage; +} + +static long compute_block_group_priority(struct btrfs_block_group_cache *bg) +{ + u8 usage; + long priority = 0; + + if (btrfs_test_opt(bg->fs_info, PRIORITY_USAGE)) { + usage = compute_block_group_usage(bg); + priority |= usage << PRIORITY_USAGE_SHIFT; + } + + return priority; +} + +static int compute_priority_level(struct btrfs_fs_info *fs_info, + long priority) +{ + int level = 0; + + if (btrfs_test_opt(fs_info, PRIORITY_USAGE)) { + u8 free; + + WARN_ON(priority < 0); + free = 100 - (priority >> PRIORITY_USAGE_SHIFT); + + if (free == 0) + level = 0; + else if (free == 100) + level = ilog2(free) + 1; + else + level = ilog2(free); + /* log2(1) == 0, leave level 0 for unused block_groups */ + level = ilog2(100) + 1 - level; + } + + return level; +}