diff mbox series

[5.4,CANDIDATE,20/25] xfs: only relog deferred intent items if free space in the log gets low

Message ID 20230213040445.192946-21-chandan.babu@oracle.com (mailing list archive)
State Superseded
Headers show
Series xfs stable candidate patches for 5.4.y (from v5.10) | expand

Commit Message

Chandan Babu R Feb. 13, 2023, 4:04 a.m. UTC 
From: "Darrick J. Wong" <darrick.wong@oracle.com>

commit 74f4d6a1e065c92428c5b588099e307a582d79d9 upstream.

Now that we have the ability to ask the log how far the tail needs to be
pushed to maintain its free space targets, augment the decision to relog
an intent item so that we only do it if the log has hit the 75% full
threshold.  There's no point in relogging an intent into the same
checkpoint, and there's no need to relog if there's plenty of free space
in the log.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
---
 fs/xfs/libxfs/xfs_defer.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
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Patch

diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
index b0b382323413..3a78a189ea01 100644
--- a/fs/xfs/libxfs/xfs_defer.c
+++ b/fs/xfs/libxfs/xfs_defer.c
@@ -372,7 +372,10 @@  xfs_defer_relog(
 	struct xfs_trans		**tpp,
 	struct list_head		*dfops)
 {
+	struct xlog			*log = (*tpp)->t_mountp->m_log;
 	struct xfs_defer_pending	*dfp;
+	xfs_lsn_t			threshold_lsn = NULLCOMMITLSN;
+
 
 	ASSERT((*tpp)->t_flags & XFS_TRANS_PERM_LOG_RES);
 
@@ -388,6 +391,19 @@  xfs_defer_relog(
 		    xfs_log_item_in_current_chkpt(dfp->dfp_intent))
 			continue;
 
+		/*
+		 * Figure out where we need the tail to be in order to maintain
+		 * the minimum required free space in the log.  Only sample
+		 * the log threshold once per call.
+		 */
+		if (threshold_lsn == NULLCOMMITLSN) {
+			threshold_lsn = xlog_grant_push_threshold(log, 0);
+			if (threshold_lsn == NULLCOMMITLSN)
+				break;
+		}
+		if (XFS_LSN_CMP(dfp->dfp_intent->li_lsn, threshold_lsn) >= 0)
+			continue;
+
 		trace_xfs_defer_relog_intent((*tpp)->t_mountp, dfp);
 		XFS_STATS_INC((*tpp)->t_mountp, defer_relog);
 		dfp->dfp_intent = xfs_trans_item_relog(dfp->dfp_intent, *tpp);