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-rw-r--r--fs/xfs/linux-2.6/xfs_super.c127
-rw-r--r--fs/xfs/xfs_trans_ail.c133
-rw-r--r--fs/xfs/xfs_trans_priv.h15
3 files changed, 124 insertions, 151 deletions
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index ee0e981aa9d1..67d5b2cddb98 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -816,75 +816,6 @@ xfs_setup_devices(
return 0;
}
-/*
- * XFS AIL push thread support
- */
-void
-xfsaild_wakeup(
- struct xfs_ail *ailp,
- xfs_lsn_t threshold_lsn)
-{
- /* only ever move the target forwards */
- if (XFS_LSN_CMP(threshold_lsn, ailp->xa_target) > 0) {
- ailp->xa_target = threshold_lsn;
- wake_up_process(ailp->xa_task);
- }
-}
-
-STATIC int
-xfsaild(
- void *data)
-{
- struct xfs_ail *ailp = data;
- xfs_lsn_t last_pushed_lsn = 0;
- long tout = 0; /* milliseconds */
-
- while (!kthread_should_stop()) {
- /*
- * for short sleeps indicating congestion, don't allow us to
- * get woken early. Otherwise all we do is bang on the AIL lock
- * without making progress.
- */
- if (tout && tout <= 20)
- __set_current_state(TASK_KILLABLE);
- else
- __set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(tout ?
- msecs_to_jiffies(tout) : MAX_SCHEDULE_TIMEOUT);
-
- /* swsusp */
- try_to_freeze();
-
- ASSERT(ailp->xa_mount->m_log);
- if (XFS_FORCED_SHUTDOWN(ailp->xa_mount))
- continue;
-
- tout = xfsaild_push(ailp, &last_pushed_lsn);
- }
-
- return 0;
-} /* xfsaild */
-
-int
-xfsaild_start(
- struct xfs_ail *ailp)
-{
- ailp->xa_target = 0;
- ailp->xa_task = kthread_run(xfsaild, ailp, "xfsaild/%s",
- ailp->xa_mount->m_fsname);
- if (IS_ERR(ailp->xa_task))
- return -PTR_ERR(ailp->xa_task);
- return 0;
-}
-
-void
-xfsaild_stop(
- struct xfs_ail *ailp)
-{
- kthread_stop(ailp->xa_task);
-}
-
-
/* Catch misguided souls that try to use this interface on XFS */
STATIC struct inode *
xfs_fs_alloc_inode(
@@ -1786,6 +1717,38 @@ xfs_destroy_zones(void)
}
STATIC int __init
+xfs_init_workqueues(void)
+{
+ /*
+ * max_active is set to 8 to give enough concurency to allow
+ * multiple work operations on each CPU to run. This allows multiple
+ * filesystems to be running sync work concurrently, and scales with
+ * the number of CPUs in the system.
+ */
+ xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_CPU_INTENSIVE, 8);
+ if (!xfs_syncd_wq)
+ goto out;
+
+ xfs_ail_wq = alloc_workqueue("xfsail", WQ_CPU_INTENSIVE, 8);
+ if (!xfs_ail_wq)
+ goto out_destroy_syncd;
+
+ return 0;
+
+out_destroy_syncd:
+ destroy_workqueue(xfs_syncd_wq);
+out:
+ return -ENOMEM;
+}
+
+STATIC void __exit
+xfs_destroy_workqueues(void)
+{
+ destroy_workqueue(xfs_ail_wq);
+ destroy_workqueue(xfs_syncd_wq);
+}
+
+STATIC int __init
init_xfs_fs(void)
{
int error;
@@ -1800,10 +1763,14 @@ init_xfs_fs(void)
if (error)
goto out;
- error = xfs_mru_cache_init();
+ error = xfs_init_workqueues();
if (error)
goto out_destroy_zones;
+ error = xfs_mru_cache_init();
+ if (error)
+ goto out_destroy_wq;
+
error = xfs_filestream_init();
if (error)
goto out_mru_cache_uninit;
@@ -1820,27 +1787,17 @@ init_xfs_fs(void)
if (error)
goto out_cleanup_procfs;
- /*
- * max_active is set to 8 to give enough concurency to allow
- * multiple work operations on each CPU to run. This allows multiple
- * filesystems to be running sync work concurrently, and scales with
- * the number of CPUs in the system.
- */
- xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_CPU_INTENSIVE, 8);
- if (!xfs_syncd_wq) {
- error = -ENOMEM;
+ error = xfs_init_workqueues();
+ if (error)
goto out_sysctl_unregister;
- }
vfs_initquota();
error = register_filesystem(&xfs_fs_type);
if (error)
- goto out_destroy_xfs_syncd;
+ goto out_sysctl_unregister;
return 0;
- out_destroy_xfs_syncd:
- destroy_workqueue(xfs_syncd_wq);
out_sysctl_unregister:
xfs_sysctl_unregister();
out_cleanup_procfs:
@@ -1851,6 +1808,8 @@ init_xfs_fs(void)
xfs_filestream_uninit();
out_mru_cache_uninit:
xfs_mru_cache_uninit();
+ out_destroy_wq:
+ xfs_destroy_workqueues();
out_destroy_zones:
xfs_destroy_zones();
out:
@@ -1862,12 +1821,12 @@ exit_xfs_fs(void)
{
vfs_exitquota();
unregister_filesystem(&xfs_fs_type);
- destroy_workqueue(xfs_syncd_wq);
xfs_sysctl_unregister();
xfs_cleanup_procfs();
xfs_buf_terminate();
xfs_filestream_uninit();
xfs_mru_cache_uninit();
+ xfs_destroy_workqueues();
xfs_destroy_zones();
}
diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c
index 12aff9584e29..cb3aeac929bc 100644
--- a/fs/xfs/xfs_trans_ail.c
+++ b/fs/xfs/xfs_trans_ail.c
@@ -28,6 +28,8 @@
#include "xfs_trans_priv.h"
#include "xfs_error.h"
+struct workqueue_struct *xfs_ail_wq; /* AIL workqueue */
+
STATIC void xfs_ail_splice(struct xfs_ail *, struct list_head *, xfs_lsn_t);
STATIC void xfs_ail_delete(struct xfs_ail *, xfs_log_item_t *);
STATIC xfs_log_item_t * xfs_ail_min(struct xfs_ail *);
@@ -69,36 +71,6 @@ xfs_trans_ail_tail(
}
/*
- * xfs_trans_push_ail
- *
- * This routine is called to move the tail of the AIL forward. It does this by
- * trying to flush items in the AIL whose lsns are below the given
- * threshold_lsn.
- *
- * the push is run asynchronously in a separate thread, so we return the tail
- * of the log right now instead of the tail after the push. This means we will
- * either continue right away, or we will sleep waiting on the async thread to
- * do its work.
- *
- * We do this unlocked - we only need to know whether there is anything in the
- * AIL at the time we are called. We don't need to access the contents of
- * any of the objects, so the lock is not needed.
- */
-void
-xfs_trans_ail_push(
- struct xfs_ail *ailp,
- xfs_lsn_t threshold_lsn)
-{
- xfs_log_item_t *lip;
-
- lip = xfs_ail_min(ailp);
- if (lip && !XFS_FORCED_SHUTDOWN(ailp->xa_mount)) {
- if (XFS_LSN_CMP(threshold_lsn, ailp->xa_target) > 0)
- xfsaild_wakeup(ailp, threshold_lsn);
- }
-}
-
-/*
* AIL traversal cursor initialisation.
*
* The cursor keeps track of where our current traversal is up
@@ -236,16 +208,16 @@ out:
}
/*
- * xfsaild_push does the work of pushing on the AIL. Returning a timeout of
- * zero indicates that the caller should sleep until woken.
+ * xfs_ail_worker does the work of pushing on the AIL. It will requeue itself
+ * to run at a later time if there is more work to do to complete the push.
*/
-long
-xfsaild_push(
- struct xfs_ail *ailp,
- xfs_lsn_t *last_lsn)
+STATIC void
+xfs_ail_worker(
+ struct work_struct *work)
{
- long tout = 0;
- xfs_lsn_t last_pushed_lsn = *last_lsn;
+ struct xfs_ail *ailp = container_of(to_delayed_work(work),
+ struct xfs_ail, xa_work);
+ long tout;
xfs_lsn_t target = ailp->xa_target;
xfs_lsn_t lsn;
xfs_log_item_t *lip;
@@ -256,15 +228,15 @@ xfsaild_push(
spin_lock(&ailp->xa_lock);
xfs_trans_ail_cursor_init(ailp, cur);
- lip = xfs_trans_ail_cursor_first(ailp, cur, *last_lsn);
+ lip = xfs_trans_ail_cursor_first(ailp, cur, ailp->xa_last_pushed_lsn);
if (!lip || XFS_FORCED_SHUTDOWN(mp)) {
/*
* AIL is empty or our push has reached the end.
*/
xfs_trans_ail_cursor_done(ailp, cur);
spin_unlock(&ailp->xa_lock);
- *last_lsn = 0;
- return tout;
+ ailp->xa_last_pushed_lsn = 0;
+ return;
}
XFS_STATS_INC(xs_push_ail);
@@ -301,13 +273,13 @@ xfsaild_push(
case XFS_ITEM_SUCCESS:
XFS_STATS_INC(xs_push_ail_success);
IOP_PUSH(lip);
- last_pushed_lsn = lsn;
+ ailp->xa_last_pushed_lsn = lsn;
break;
case XFS_ITEM_PUSHBUF:
XFS_STATS_INC(xs_push_ail_pushbuf);
IOP_PUSHBUF(lip);
- last_pushed_lsn = lsn;
+ ailp->xa_last_pushed_lsn = lsn;
push_xfsbufd = 1;
break;
@@ -319,7 +291,7 @@ xfsaild_push(
case XFS_ITEM_LOCKED:
XFS_STATS_INC(xs_push_ail_locked);
- last_pushed_lsn = lsn;
+ ailp->xa_last_pushed_lsn = lsn;
stuck++;
break;
@@ -374,9 +346,23 @@ xfsaild_push(
wake_up_process(mp->m_ddev_targp->bt_task);
}
+ /* assume we have more work to do in a short while */
+ tout = 10;
if (!count) {
/* We're past our target or empty, so idle */
- last_pushed_lsn = 0;
+ ailp->xa_last_pushed_lsn = 0;
+
+ /*
+ * Check for an updated push target before clearing the
+ * XFS_AIL_PUSHING_BIT. If the target changed, we've got more
+ * work to do. Wait a bit longer before starting that work.
+ */
+ smp_rmb();
+ if (ailp->xa_target == target) {
+ clear_bit(XFS_AIL_PUSHING_BIT, &ailp->xa_flags);
+ return;
+ }
+ tout = 50;
} else if (XFS_LSN_CMP(lsn, target) >= 0) {
/*
* We reached the target so wait a bit longer for I/O to
@@ -384,7 +370,7 @@ xfsaild_push(
* start the next scan from the start of the AIL.
*/
tout = 50;
- last_pushed_lsn = 0;
+ ailp->xa_last_pushed_lsn = 0;
} else if ((stuck * 100) / count > 90) {
/*
* Either there is a lot of contention on the AIL or we
@@ -396,14 +382,48 @@ xfsaild_push(
* continuing from where we were.
*/
tout = 20;
- } else {
- /* more to do, but wait a short while before continuing */
- tout = 10;
}
- *last_lsn = last_pushed_lsn;
- return tout;
+
+ /* There is more to do, requeue us. */
+ queue_delayed_work(xfs_syncd_wq, &ailp->xa_work,
+ msecs_to_jiffies(tout));
}
+/*
+ * This routine is called to move the tail of the AIL forward. It does this by
+ * trying to flush items in the AIL whose lsns are below the given
+ * threshold_lsn.
+ *
+ * The push is run asynchronously in a workqueue, which means the caller needs
+ * to handle waiting on the async flush for space to become available.
+ * We don't want to interrupt any push that is in progress, hence we only queue
+ * work if we set the pushing bit approriately.
+ *
+ * We do this unlocked - we only need to know whether there is anything in the
+ * AIL at the time we are called. We don't need to access the contents of
+ * any of the objects, so the lock is not needed.
+ */
+void
+xfs_trans_ail_push(
+ struct xfs_ail *ailp,
+ xfs_lsn_t threshold_lsn)
+{
+ xfs_log_item_t *lip;
+
+ lip = xfs_ail_min(ailp);
+ if (!lip || XFS_FORCED_SHUTDOWN(ailp->xa_mount) ||
+ XFS_LSN_CMP(threshold_lsn, ailp->xa_target) <= 0)
+ return;
+
+ /*
+ * Ensure that the new target is noticed in push code before it clears
+ * the XFS_AIL_PUSHING_BIT.
+ */
+ smp_wmb();
+ ailp->xa_target = threshold_lsn;
+ if (!test_and_set_bit(XFS_AIL_PUSHING_BIT, &ailp->xa_flags))
+ queue_delayed_work(xfs_syncd_wq, &ailp->xa_work, 0);
+}
/*
* This is to be called when an item is unlocked that may have
@@ -615,7 +635,6 @@ xfs_trans_ail_init(
xfs_mount_t *mp)
{
struct xfs_ail *ailp;
- int error;
ailp = kmem_zalloc(sizeof(struct xfs_ail), KM_MAYFAIL);
if (!ailp)
@@ -624,15 +643,9 @@ xfs_trans_ail_init(
ailp->xa_mount = mp;
INIT_LIST_HEAD(&ailp->xa_ail);
spin_lock_init(&ailp->xa_lock);
- error = xfsaild_start(ailp);
- if (error)
- goto out_free_ailp;
+ INIT_DELAYED_WORK(&ailp->xa_work, xfs_ail_worker);
mp->m_ail = ailp;
return 0;
-
-out_free_ailp:
- kmem_free(ailp);
- return error;
}
void
@@ -641,7 +654,7 @@ xfs_trans_ail_destroy(
{
struct xfs_ail *ailp = mp->m_ail;
- xfsaild_stop(ailp);
+ cancel_delayed_work_sync(&ailp->xa_work);
kmem_free(ailp);
}
diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h
index 35162c238fa3..6ebd322bd37c 100644
--- a/fs/xfs/xfs_trans_priv.h
+++ b/fs/xfs/xfs_trans_priv.h
@@ -65,16 +65,22 @@ struct xfs_ail_cursor {
struct xfs_ail {
struct xfs_mount *xa_mount;
struct list_head xa_ail;
- uint xa_gen;
- struct task_struct *xa_task;
xfs_lsn_t xa_target;
struct xfs_ail_cursor xa_cursors;
spinlock_t xa_lock;
+ struct delayed_work xa_work;
+ xfs_lsn_t xa_last_pushed_lsn;
+ unsigned long xa_flags;
};
+#define XFS_AIL_PUSHING_BIT 0
+
/*
* From xfs_trans_ail.c
*/
+
+extern struct workqueue_struct *xfs_ail_wq; /* AIL workqueue */
+
void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
struct xfs_log_item **log_items, int nr_items,
xfs_lsn_t lsn) __releases(ailp->xa_lock);
@@ -112,11 +118,6 @@ struct xfs_log_item *xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
void xfs_trans_ail_cursor_done(struct xfs_ail *ailp,
struct xfs_ail_cursor *cur);
-long xfsaild_push(struct xfs_ail *, xfs_lsn_t *);
-void xfsaild_wakeup(struct xfs_ail *, xfs_lsn_t);
-int xfsaild_start(struct xfs_ail *);
-void xfsaild_stop(struct xfs_ail *);
-
#if BITS_PER_LONG != 64
static inline void
xfs_trans_ail_copy_lsn(
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-24 20:20:37 +0000