From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, TVD_PH_BODY_ACCOUNTS_PRE,UNPARSEABLE_RELAY,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C64E1C43331 for ; Tue, 24 Mar 2020 20:39:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 908AE20735 for ; Tue, 24 Mar 2020 20:39:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="GQMn9diP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727025AbgCXUjQ (ORCPT ); Tue, 24 Mar 2020 16:39:16 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:36090 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726984AbgCXUjQ (ORCPT ); Tue, 24 Mar 2020 16:39:16 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 02OKd7GZ077903; Tue, 24 Mar 2020 20:39:08 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : in-reply-to; s=corp-2020-01-29; bh=+h+x8DDFTWZavSQwMJybkNv78WYu+TMmtnuYQUkFze8=; b=GQMn9diP+vQOibwwDa7RCqXm3eAfABsjafEyuivkhRvI8MRxv0siXh+HHUpG/jliqbtM ldnvjNL/QD90GKH0bpJTJlv+PCsqNXEqByCc4nJInE7WGUPYemu2mI7MQl+3nw+MkX9A cnBrtR0pQPOyaUYpgQdma3DjAvDzdxrCUBnqIiG6Tkz23f93wp4zZwxHY8icuCjISdUC dASLBOt4uPaWFbG3nA6PzRHwn2fQBMPGQYf3EPPYjhZh/ar1FcHHjeMQLDlkNNdqbJWg Mzg20pYfhyRuDNNEZ0L22+mM2+KNj6FmmzNwWe3avmiMbKi0t785X2Tv2wQOPWPnMcNZ 4Q== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by aserp2120.oracle.com with ESMTP id 2ywavm6jna-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 24 Mar 2020 20:39:08 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 02OKaOVh089007; Tue, 24 Mar 2020 20:39:07 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserp3020.oracle.com with ESMTP id 2yymbub97k-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 24 Mar 2020 20:39:07 +0000 Received: from abhmp0016.oracle.com (abhmp0016.oracle.com [141.146.116.22]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 02OKd2QQ021800; Tue, 24 Mar 2020 20:39:02 GMT Received: from localhost (/10.159.142.243) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 24 Mar 2020 13:39:01 -0700 Date: Tue, 24 Mar 2020 13:39:00 -0700 From: "Darrick J. Wong" To: Christoph Hellwig Cc: linux-xfs@vger.kernel.org, david@fromorbit.com, Dave Chinner Subject: Re: [PATCH 1/8] xfs: don't try to write a start record into every iclog Message-ID: <20200324203900.GH29339@magnolia> References: <20200324174459.770999-1-hch@lst.de> <20200324174459.770999-2-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200324174459.770999-2-hch@lst.de> User-Agent: Mutt/1.9.4 (2018-02-28) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9570 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 suspectscore=0 adultscore=0 malwarescore=0 bulkscore=0 spamscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003240103 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9570 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 priorityscore=1501 mlxscore=0 bulkscore=0 clxscore=1015 impostorscore=0 phishscore=0 suspectscore=0 mlxlogscore=999 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003240103 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org On Tue, Mar 24, 2020 at 06:44:52PM +0100, Christoph Hellwig wrote: > From: Dave Chinner > > The xlog_write() function iterates over iclogs until it completes > writing all the log vectors passed in. The ticket tracks whether > a start record has been written or not, so only the first iclog gets > a start record. We only ever pass single use tickets to > xlog_write() so we only ever need to write a start record once per > xlog_write() call. > > Hence we don't need to store whether we should write a start record > in the ticket as the callers provide all the information we need to > determine if a start record should be written. For the moment, we > have to ensure that we clear the XLOG_TIC_INITED appropriately so > the code in xfs_log_done() still works correctly for committing > transactions. > > Signed-off-by: Dave Chinner > [hch: use an need_start_rec bool] > Signed-off-by: Christoph Hellwig Looks ok, Reviewed-by: Darrick J. Wong --D > --- > fs/xfs/xfs_log.c | 63 ++++++++++++++++++++++++------------------------ > 1 file changed, 32 insertions(+), 31 deletions(-) > > diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c > index 2a90a483c2d6..bf071552094a 100644 > --- a/fs/xfs/xfs_log.c > +++ b/fs/xfs/xfs_log.c > @@ -2112,23 +2112,21 @@ xlog_print_trans( > } > > /* > - * Calculate the potential space needed by the log vector. Each region gets > - * its own xlog_op_header_t and may need to be double word aligned. > + * Calculate the potential space needed by the log vector. We may need a start > + * record, and each region gets its own struct xlog_op_header and may need to be > + * double word aligned. > */ > static int > xlog_write_calc_vec_length( > struct xlog_ticket *ticket, > - struct xfs_log_vec *log_vector) > + struct xfs_log_vec *log_vector, > + bool need_start_rec) > { > struct xfs_log_vec *lv; > - int headers = 0; > + int headers = need_start_rec ? 1 : 0; > int len = 0; > int i; > > - /* acct for start rec of xact */ > - if (ticket->t_flags & XLOG_TIC_INITED) > - headers++; > - > for (lv = log_vector; lv; lv = lv->lv_next) { > /* we don't write ordered log vectors */ > if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) > @@ -2150,27 +2148,16 @@ xlog_write_calc_vec_length( > return len; > } > > -/* > - * If first write for transaction, insert start record We can't be trying to > - * commit if we are inited. We can't have any "partial_copy" if we are inited. > - */ > -static int > +static void > xlog_write_start_rec( > struct xlog_op_header *ophdr, > struct xlog_ticket *ticket) > { > - if (!(ticket->t_flags & XLOG_TIC_INITED)) > - return 0; > - > ophdr->oh_tid = cpu_to_be32(ticket->t_tid); > ophdr->oh_clientid = ticket->t_clientid; > ophdr->oh_len = 0; > ophdr->oh_flags = XLOG_START_TRANS; > ophdr->oh_res2 = 0; > - > - ticket->t_flags &= ~XLOG_TIC_INITED; > - > - return sizeof(struct xlog_op_header); > } > > static xlog_op_header_t * > @@ -2372,25 +2359,29 @@ xlog_write( > int record_cnt = 0; > int data_cnt = 0; > int error = 0; > + bool need_start_rec = true; > > *start_lsn = 0; > > - len = xlog_write_calc_vec_length(ticket, log_vector); > > /* > * Region headers and bytes are already accounted for. > * We only need to take into account start records and > * split regions in this function. > */ > - if (ticket->t_flags & XLOG_TIC_INITED) > - ticket->t_curr_res -= sizeof(xlog_op_header_t); > + if (ticket->t_flags & XLOG_TIC_INITED) { > + ticket->t_curr_res -= sizeof(struct xlog_op_header); > + ticket->t_flags &= ~XLOG_TIC_INITED; > + } > > /* > * Commit record headers need to be accounted for. These > * come in as separate writes so are easy to detect. > */ > - if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS)) > - ticket->t_curr_res -= sizeof(xlog_op_header_t); > + if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS)) { > + ticket->t_curr_res -= sizeof(struct xlog_op_header); > + need_start_rec = false; > + } > > if (ticket->t_curr_res < 0) { > xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, > @@ -2399,6 +2390,8 @@ xlog_write( > xfs_force_shutdown(log->l_mp, SHUTDOWN_LOG_IO_ERROR); > } > > + len = xlog_write_calc_vec_length(ticket, log_vector, need_start_rec); > + > index = 0; > lv = log_vector; > vecp = lv->lv_iovecp; > @@ -2425,7 +2418,6 @@ xlog_write( > while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { > struct xfs_log_iovec *reg; > struct xlog_op_header *ophdr; > - int start_rec_copy; > int copy_len; > int copy_off; > bool ordered = false; > @@ -2441,11 +2433,15 @@ xlog_write( > ASSERT(reg->i_len % sizeof(int32_t) == 0); > ASSERT((unsigned long)ptr % sizeof(int32_t) == 0); > > - start_rec_copy = xlog_write_start_rec(ptr, ticket); > - if (start_rec_copy) { > - record_cnt++; > + /* > + * Before we start formatting log vectors, we need to > + * write a start record. Only do this for the first > + * iclog we write to. > + */ > + if (need_start_rec) { > + xlog_write_start_rec(ptr, ticket); > xlog_write_adv_cnt(&ptr, &len, &log_offset, > - start_rec_copy); > + sizeof(struct xlog_op_header)); > } > > ophdr = xlog_write_setup_ophdr(log, ptr, ticket, flags); > @@ -2477,8 +2473,13 @@ xlog_write( > xlog_write_adv_cnt(&ptr, &len, &log_offset, > copy_len); > } > - copy_len += start_rec_copy + sizeof(xlog_op_header_t); > + copy_len += sizeof(struct xlog_op_header); > record_cnt++; > + if (need_start_rec) { > + copy_len += sizeof(struct xlog_op_header); > + record_cnt++; > + need_start_rec = false; > + } > data_cnt += contwr ? copy_len : 0; > > error = xlog_write_copy_finish(log, iclog, flags, > -- > 2.25.1 >