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From: Dave Chinner <david@fromorbit.com>
To: xfs@oss.sgi.com
Subject: [PATCH 09/12] xfs: convert log grant heads to atomic variables
Date: Mon, 13 Dec 2010 15:44:40 +1100	[thread overview]
Message-ID: <1292215483-18224-10-git-send-email-david@fromorbit.com> (raw)
In-Reply-To: <1292215483-18224-1-git-send-email-david@fromorbit.com>

From: Dave Chinner <dchinner@redhat.com>

Convert the log grant heads to atomic64_t types in preparation for
converting the accounting algorithms to atomic operations. his patch
just converts the variables; the algorithmic changes are in a
separate patch for clarity.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/xfs_log.c      |    8 ++++----
 fs/xfs/xfs_log_priv.h |   12 ++++++------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 57bd143..cddfc6b 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -47,7 +47,7 @@ STATIC xlog_t *  xlog_alloc_log(xfs_mount_t	*mp,
 				xfs_buftarg_t	*log_target,
 				xfs_daddr_t	blk_offset,
 				int		num_bblks);
-STATIC int	 xlog_space_left(struct log *log, int64_t *head);
+STATIC int	 xlog_space_left(struct log *log, atomic64_t *head);
 STATIC int	 xlog_sync(xlog_t *log, xlog_in_core_t *iclog);
 STATIC void	 xlog_dealloc_log(xlog_t *log);
 
@@ -100,7 +100,7 @@ STATIC int	xlog_iclogs_empty(xlog_t *log);
 static void
 xlog_grant_sub_space(
 	struct log	*log,
-	int64_t		*head,
+	atomic64_t	*head,
 	int		bytes)
 {
 	int		cycle, space;
@@ -119,7 +119,7 @@ xlog_grant_sub_space(
 static void
 xlog_grant_add_space(
 	struct log	*log,
-	int64_t		*head,
+	atomic64_t	*head,
 	int		bytes)
 {
 	int		tmp;
@@ -816,7 +816,7 @@ xlog_assign_tail_lsn(
 STATIC int
 xlog_space_left(
 	struct log	*log,
-	int64_t		*head)
+	atomic64_t	*head)
 {
 	int		free_bytes;
 	int		tail_bytes;
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 100a410..24f510f 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -515,8 +515,8 @@ typedef struct log {
 	spinlock_t		l_grant_lock ____cacheline_aligned_in_smp;
 	struct list_head	l_reserveq;
 	struct list_head	l_writeq;
-	int64_t			l_grant_reserve_head;
-	int64_t			l_grant_write_head;
+	atomic64_t			l_grant_reserve_head;
+	atomic64_t			l_grant_write_head;
 
 	/*
 	 * l_last_sync_lsn and l_tail_lsn are atomics so they can be set and
@@ -594,18 +594,18 @@ xlog_assign_atomic_lsn(atomic64_t *lsn, uint cycle, uint block)
  * will always get consistent component values to work from.
  */
 static inline void
-xlog_crack_grant_head(int64_t *head, int *cycle, int *space)
+xlog_crack_grant_head(atomic64_t *head, int *cycle, int *space)
 {
-	int64_t	val = *head;
+	int64_t	val = atomic64_read(head);
 
 	*cycle = val >> 32;
 	*space = val & 0xffffffff;
 }
 
 static inline void
-xlog_assign_grant_head(int64_t *head, int cycle, int space)
+xlog_assign_grant_head(atomic64_t *head, int cycle, int space)
 {
-	*head = ((int64_t)cycle << 32) | space;
+	atomic64_set(head, ((int64_t)cycle << 32) | space);
 }
 
 /*
-- 
1.7.2.3

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  parent reply	other threads:[~2010-12-13  4:55 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-13  4:44 xfs: grant lock scaling and removal V3 Dave Chinner
2010-12-13  4:44 ` [PATCH 01/12] xfs: convert log grant ticket queues to list heads Dave Chinner
2010-12-20 11:34   ` Christoph Hellwig
2010-12-21  0:55     ` Dave Chinner
2010-12-13  4:44 ` [PATCH 02/12] xfs: fact out common grant head/log tail verification code Dave Chinner
2010-12-20 11:51   ` Christoph Hellwig
2010-12-13  4:44 ` [PATCH 03/12] xfs: rework log grant space calculations Dave Chinner
2010-12-20 11:37   ` Christoph Hellwig
2010-12-13  4:44 ` [PATCH 04/12] xfs: combine grant heads into a single 64 bit integer Dave Chinner
2010-12-20 11:40   ` Christoph Hellwig
2010-12-13  4:44 ` [PATCH 05/12] xfs: use wait queues directly for the log wait queues Dave Chinner
2010-12-20 11:40   ` Christoph Hellwig
2010-12-13  4:44 ` [PATCH 06/12] xfs: make AIL tail pushing independent of the grant lock Dave Chinner
2010-12-20 11:41   ` Christoph Hellwig
2010-12-13  4:44 ` [PATCH 07/12] xfs: convert l_last_sync_lsn to an atomic variable Dave Chinner
2010-12-13  4:44 ` [PATCH 08/12] xfs: convert l_tail_lsn " Dave Chinner
2010-12-20 12:06   ` Christoph Hellwig
2010-12-21  1:27     ` Dave Chinner
2010-12-13  4:44 ` Dave Chinner [this message]
2010-12-13  4:44 ` [PATCH 10/12] xfs: introduce new locks for the log grant ticket wait queues Dave Chinner
2010-12-20 11:49   ` Christoph Hellwig
2010-12-13  4:44 ` [PATCH 11/12] xfs: convert grant head manipulations to lockless algorithm Dave Chinner
2010-12-20 11:50   ` Christoph Hellwig
2010-12-13  4:44 ` [PATCH 12/12] xfs: kill useless spinlock_destroy macro Dave Chinner

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