Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759225Ab3GaImd (ORCPT ); Wed, 31 Jul 2013 04:42:33 -0400 Received: from e7.ny.us.ibm.com ([32.97.182.137]:53218 "EHLO e7.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753016Ab3GaImD (ORCPT ); Wed, 31 Jul 2013 04:42:03 -0400 From: zwu.kernel@gmail.com To: xfs@oss.sgi.com Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Zhi Yong Wu Subject: [PATCH v3] xfs: introduce object readahead to log recovery Date: Wed, 31 Jul 2013 16:42:45 +0800 Message-Id: <1375260165-8773-1-git-send-email-zwu.kernel@gmail.com> X-Mailer: git-send-email 1.7.11.7 X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13073108-5806-0000-0000-000022405D08 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5792 Lines: 232 From: Zhi Yong Wu It can take a long time to run log recovery operation because it is single threaded and is bound by read latency. We can find that it took most of the time to wait for the read IO to occur, so if one object readahead is introduced to log recovery, it will obviously reduce the log recovery time. Log recovery time stat: w/o this patch w/ this patch real: 0m15.023s 0m7.802s user: 0m0.001s 0m0.001s sys: 0m0.246s 0m0.107s Signed-off-by: Zhi Yong Wu --- fs/xfs/xfs_log_recover.c | 159 +++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 153 insertions(+), 6 deletions(-) diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index 7681b19..ebb00bc 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -3116,6 +3116,106 @@ xlog_recover_free_trans( kmem_free(trans); } +STATIC void +xlog_recover_buffer_ra_pass2( + struct xlog *log, + struct xlog_recover_item *item) +{ + struct xfs_buf_log_format *buf_f = item->ri_buf[0].i_addr; + struct xfs_mount *mp = log->l_mp; + + if (xlog_check_buffer_cancelled(log, buf_f->blf_blkno, + buf_f->blf_len, buf_f->blf_flags)) { + return; + } + + xfs_buf_readahead(mp->m_ddev_targp, buf_f->blf_blkno, + buf_f->blf_len, NULL); +} + +STATIC void +xlog_recover_inode_ra_pass2( + struct xlog *log, + struct xlog_recover_item *item) +{ + struct xfs_inode_log_format ilf_buf; + struct xfs_inode_log_format *ilfp; + struct xfs_mount *mp = log->l_mp; + int error; + + if (item->ri_buf[0].i_len == sizeof(struct xfs_inode_log_format)) { + ilfp = item->ri_buf[0].i_addr; + } else { + ilfp = &ilf_buf; + memset(ilfp, 0, sizeof(*ilfp)); + error = xfs_inode_item_format_convert(&item->ri_buf[0], ilfp); + if (error) + return; + } + + if (xlog_check_buffer_cancelled(log, ilfp->ilf_blkno, ilfp->ilf_len, 0)) + return; + + xfs_buf_readahead(mp->m_ddev_targp, ilfp->ilf_blkno, + ilfp->ilf_len, &xfs_inode_buf_ops); +} + +STATIC void +xlog_recover_dquot_ra_pass2( + struct xlog *log, + struct xlog_recover_item *item) +{ + struct xfs_mount *mp = log->l_mp; + struct xfs_disk_dquot *recddq; + struct xfs_dq_logformat *dq_f; + uint type; + + + if (mp->m_qflags == 0) + return; + + recddq = item->ri_buf[1].i_addr; + if (recddq == NULL) + return; + if (item->ri_buf[1].i_len < sizeof(struct xfs_disk_dquot)) + return; + + type = recddq->d_flags & (XFS_DQ_USER | XFS_DQ_PROJ | XFS_DQ_GROUP); + ASSERT(type); + if (log->l_quotaoffs_flag & type) + return; + + dq_f = item->ri_buf[0].i_addr; + ASSERT(dq_f); + ASSERT(dq_f->qlf_len == 1); + + xfs_buf_readahead(mp->m_ddev_targp, dq_f->qlf_blkno, + dq_f->qlf_len, NULL); +} + +STATIC void +xlog_recover_ra_pass2( + struct xlog *log, + struct xlog_recover_item *item) +{ + switch (ITEM_TYPE(item)) { + case XFS_LI_BUF: + xlog_recover_buffer_ra_pass2(log, item); + break; + case XFS_LI_INODE: + xlog_recover_inode_ra_pass2(log, item); + break; + case XFS_LI_DQUOT: + xlog_recover_dquot_ra_pass2(log, item); + break; + case XFS_LI_EFI: + case XFS_LI_EFD: + case XFS_LI_QUOTAOFF: + default: + break; + } +} + STATIC int xlog_recover_commit_pass1( struct xlog *log, @@ -3177,6 +3277,26 @@ xlog_recover_commit_pass2( } } +STATIC int +xlog_recover_items_pass2( + struct xlog *log, + struct xlog_recover *trans, + struct list_head *buffer_list, + struct list_head *item_list) +{ + struct xlog_recover_item *item; + int error = 0; + + list_for_each_entry(item, item_list, ri_list) { + error = xlog_recover_commit_pass2(log, trans, + buffer_list, item); + if (error) + return error; + } + + return error; +} + /* * Perform the transaction. * @@ -3189,9 +3309,16 @@ xlog_recover_commit_trans( struct xlog_recover *trans, int pass) { - int error = 0, error2; - xlog_recover_item_t *item; - LIST_HEAD (buffer_list); + int error = 0; + int error2; + int items_queued = 0; + struct xlog_recover_item *item; + struct xlog_recover_item *next; + LIST_HEAD (buffer_list); + LIST_HEAD (ra_list); + LIST_HEAD (done_list); + + #define XLOG_RECOVER_COMMIT_QUEUE_MAX 100 hlist_del(&trans->r_list); @@ -3199,14 +3326,22 @@ xlog_recover_commit_trans( if (error) return error; - list_for_each_entry(item, &trans->r_itemq, ri_list) { + list_for_each_entry_safe(item, next, &trans->r_itemq, ri_list) { switch (pass) { case XLOG_RECOVER_PASS1: error = xlog_recover_commit_pass1(log, trans, item); break; case XLOG_RECOVER_PASS2: - error = xlog_recover_commit_pass2(log, trans, - &buffer_list, item); + xlog_recover_ra_pass2(log, item); + list_move_tail(&item->ri_list, &ra_list); + items_queued++; + if (items_queued >= XLOG_RECOVER_COMMIT_QUEUE_MAX) { + error = xlog_recover_items_pass2(log, trans, + &buffer_list, &ra_list); + list_splice_tail_init(&ra_list, &done_list); + items_queued = 0; + } + break; default: ASSERT(0); @@ -3216,6 +3351,18 @@ xlog_recover_commit_trans( goto out; } + if (!list_empty(&ra_list)) { + error = xlog_recover_items_pass2(log, trans, + &buffer_list, &ra_list); + if (error) + goto out; + + list_splice_tail_init(&ra_list, &done_list); + } + + if (!list_empty(&done_list)) + list_splice_init(&done_list, &trans->r_itemq); + xlog_recover_free_trans(trans); out: -- 1.7.11.7 -- 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/