From patchwork Thu Jul 21 04:58:17 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Darrick J. Wong" X-Patchwork-Id: 9240827 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7176D60756 for ; Thu, 21 Jul 2016 04:58:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 67CE227C0B for ; Thu, 21 Jul 2016 04:58:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5CE4327CF9; Thu, 21 Jul 2016 04:58:27 +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=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY 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 110DF27C0B for ; Thu, 21 Jul 2016 04:58:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751271AbcGUE6Z (ORCPT ); Thu, 21 Jul 2016 00:58:25 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:25857 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751254AbcGUE6Z (ORCPT ); Thu, 21 Jul 2016 00:58:25 -0400 Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id u6L4wJHi022506 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 21 Jul 2016 04:58:20 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userv0021.oracle.com (8.13.8/8.13.8) with ESMTP id u6L4wJtf007760 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 21 Jul 2016 04:58:19 GMT Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by aserv0121.oracle.com (8.13.8/8.13.8) with ESMTP id u6L4wIEY017750; Thu, 21 Jul 2016 04:58:19 GMT Received: from localhost (/24.21.211.40) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 20 Jul 2016 21:58:18 -0700 Subject: [PATCH 20/47] xfs: increase XFS_BTREE_MAXLEVELS to fit the rmapbt From: "Darrick J. Wong" To: david@fromorbit.com, darrick.wong@oracle.com Cc: linux-fsdevel@vger.kernel.org, vishal.l.verma@intel.com, bfoster@redhat.com, xfs@oss.sgi.com Date: Wed, 20 Jul 2016 21:58:17 -0700 Message-ID: <146907709719.25461.3104352212846077948.stgit@birch.djwong.org> In-Reply-To: <146907695530.25461.3225785294902719773.stgit@birch.djwong.org> References: <146907695530.25461.3225785294902719773.stgit@birch.djwong.org> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP By my calculations, a 1,073,741,824 block AG with a 1k block size can attain a maximum height of 9. Assuming a record size of 24 bytes, a key/ptr size of 44 bytes, and half-full btree nodes, we'd need 53,687,092 blocks for the records and ~6 million blocks for the keys. That requires a btree of height 9. Signed-off-by: Darrick J. Wong Reviewed-by: Brian Foster --- fs/xfs/libxfs/xfs_btree.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h index b8bbb21..629ef4f 100644 --- a/fs/xfs/libxfs/xfs_btree.h +++ b/fs/xfs/libxfs/xfs_btree.h @@ -133,7 +133,7 @@ do { \ } \ } while (0) -#define XFS_BTREE_MAXLEVELS 8 /* max of all btrees */ +#define XFS_BTREE_MAXLEVELS 9 /* max of all btrees */ struct xfs_btree_ops { /* size of the key and record structures */