From 92d9cd1059f80b9c89dee191ffb88b0872e6a7ae Mon Sep 17 00:00:00 2001
From: David Chinner <dgc@sgi.com>
Date: Thu, 6 Mar 2008 13:45:10 +1100
Subject: [PATCH] [XFS] 977545 977545 977545 977545 977545 977545 xfsaild
causing too many wakeups
Idle state is not being detected properly by the xfsaild push code. The
current idle state is detected by an empty list which may never happen
with mostly idle filesystem or one using lazy superblock counters. A
single dirty item in the list that exists beyond the push target can
result repeated looping attempting to push up to the target because it
fails to check if the push target has been acheived or not.
Fix by considering a dirty list with everything past the target as an idle
state and set the timeout appropriately.
SGI-PV: 977545
SGI-Modid: xfs-linux-melb:xfs-kern:30532a
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
---
fs/xfs/xfs_trans_ail.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c
index 4d6330eddc8d32..76d470d8a1e63b 100644
--- a/fs/xfs/xfs_trans_ail.c
+++ b/fs/xfs/xfs_trans_ail.c
@@ -261,16 +261,19 @@ xfsaild_push(
xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
}
- /*
- * We reached the target so wait a bit longer for I/O to complete and
- * remove pushed items from the AIL before we start the next scan from
- * the start of the AIL.
- */
- if ((XFS_LSN_CMP(lsn, target) >= 0)) {
+ if (!count) {
+ /* We're past our target or empty, so idle */
+ tout = 1000;
+ } else if (XFS_LSN_CMP(lsn, target) >= 0) {
+ /*
+ * We reached the target so wait a bit longer for I/O to
+ * complete and remove pushed items from the AIL before we
+ * start the next scan from the start of the AIL.
+ */
tout += 20;
last_pushed_lsn = 0;
} else if ((restarts > XFS_TRANS_PUSH_AIL_RESTARTS) ||
- (count && ((stuck * 100) / count > 90))) {
+ ((stuck * 100) / count > 90)) {
/*
* Either there is a lot of contention on the AIL or we
* are stuck due to operations in progress. "Stuck" in this
--
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