diff options
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_super.c | 59 | ||||
| -rw-r--r-- | fs/xfs/xfs_log.c | 33 | ||||
| -rw-r--r-- | fs/xfs/xfs_mount.c | 6 | ||||
| -rw-r--r-- | fs/xfs/xfs_mount.h | 10 | ||||
| -rw-r--r-- | fs/xfs/xfs_trans.h | 5 | ||||
| -rw-r--r-- | fs/xfs/xfs_trans_ail.c | 269 | ||||
| -rw-r--r-- | fs/xfs/xfs_trans_priv.h | 8 |
7 files changed, 282 insertions, 108 deletions
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c index 70024a2..156a1a7 100644 --- a/fs/xfs/linux-2.6/xfs_super.c +++ b/fs/xfs/linux-2.6/xfs_super.c @@ -51,6 +51,7 @@ #include "xfs_vfsops.h" #include "xfs_version.h" #include "xfs_log_priv.h" +#include "xfs_trans_priv.h" #include <linux/namei.h> #include <linux/init.h> @@ -765,6 +766,64 @@ xfs_blkdev_issue_flush( blkdev_issue_flush(buftarg->bt_bdev, NULL); } +/* + * XFS AIL push thread support + */ +void +xfsaild_wakeup( + xfs_mount_t *mp, + xfs_lsn_t threshold_lsn) +{ + mp->m_ail.xa_target = threshold_lsn; + wake_up_process(mp->m_ail.xa_task); +} + +int +xfsaild( + void *data) +{ + xfs_mount_t *mp = (xfs_mount_t *)data; + xfs_lsn_t last_pushed_lsn = 0; + long tout = 0; + + while (!kthread_should_stop()) { + if (tout) + schedule_timeout_interruptible(msecs_to_jiffies(tout)); + tout = 1000; + + /* swsusp */ + try_to_freeze(); + + ASSERT(mp->m_log); + if (XFS_FORCED_SHUTDOWN(mp)) + continue; + + tout = xfsaild_push(mp, &last_pushed_lsn); + } + + return 0; +} /* xfsaild */ + +int +xfsaild_start( + xfs_mount_t *mp) +{ + mp->m_ail.xa_target = 0; + mp->m_ail.xa_task = kthread_run(xfsaild, mp, "xfsaild"); + if (IS_ERR(mp->m_ail.xa_task)) + return -PTR_ERR(mp->m_ail.xa_task); + return 0; +} + +void +xfsaild_stop( + xfs_mount_t *mp) +{ + kthread_stop(mp->m_ail.xa_task); +} + + + STATIC struct inode * xfs_fs_alloc_inode( struct super_block *sb) diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index 4c86a26..b3ac380 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -498,11 +498,14 @@ xfs_log_reserve(xfs_mount_t *mp, * Return error or zero. */ int -xfs_log_mount(xfs_mount_t *mp, - xfs_buftarg_t *log_target, - xfs_daddr_t blk_offset, - int num_bblks) +xfs_log_mount( + xfs_mount_t *mp, + xfs_buftarg_t *log_target, + xfs_daddr_t blk_offset, + int num_bblks) { + int error; + if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); else { @@ -515,11 +518,21 @@ xfs_log_mount(xfs_mount_t *mp, mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); /* + * Initialize the AIL now we have a log. + */ + spin_lock_init(&mp->m_ail_lock); + error = xfs_trans_ail_init(mp); + if (error) { + cmn_err(CE_WARN, "XFS: AIL initialisation failed: error %d", error); + goto error; + } + + /* * skip log recovery on a norecovery mount. pretend it all * just worked. */ if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { - int error, readonly = (mp->m_flags & XFS_MOUNT_RDONLY); + int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); if (readonly) mp->m_flags &= ~XFS_MOUNT_RDONLY; @@ -530,8 +543,7 @@ xfs_log_mount(xfs_mount_t *mp, mp->m_flags |= XFS_MOUNT_RDONLY; if (error) { cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); - xlog_dealloc_log(mp->m_log); - return error; + goto error; } } @@ -540,6 +552,9 @@ xfs_log_mount(xfs_mount_t *mp, /* End mounting message in xfs_log_mount_finish */ return 0; +error: + xfs_log_unmount_dealloc(mp); + return error; } /* xfs_log_mount */ /* @@ -722,10 +737,14 @@ xfs_log_unmount_write(xfs_mount_t *mp) /* * Deallocate log structures for unmount/relocation. + * + * We need to stop the aild from running before we destroy + * and deallocate the log as the aild references the log. */ void xfs_log_unmount_dealloc(xfs_mount_t *mp) { + xfs_trans_ail_destroy(mp); xlog_dealloc_log(mp->m_log); } diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 766c016..6409b37 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -136,15 +136,9 @@ xfs_mount_init(void) mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB; } - spin_lock_init(&mp->m_ail_lock); spin_lock_init(&mp->m_sb_lock); mutex_init(&mp->m_ilock); mutex_init(&mp->m_growlock); - /* - * Initialize the AIL. - */ - xfs_trans_ail_init(mp); - atomic_set(&mp->m_active_trans, 0); return mp; diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index 15025e0..f7c620e 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -219,12 +219,18 @@ extern void xfs_icsb_sync_counters_flags(struct xfs_mount *, int); #define xfs_icsb_sync_counters_flags(mp, flags) do { } while (0) #endif +typedef struct xfs_ail { + xfs_ail_entry_t xa_ail; + uint xa_gen; + struct task_struct *xa_task; + xfs_lsn_t xa_target; +} xfs_ail_t; + typedef struct xfs_mount { struct super_block *m_super; xfs_tid_t m_tid; /* next unused tid for fs */ spinlock_t m_ail_lock; /* fs AIL mutex */ - xfs_ail_entry_t m_ail; /* fs active log item list */ - uint m_ail_gen; /* fs AIL generation count */ + xfs_ail_t m_ail; /* fs active log item list */ xfs_sb_t m_sb; /* copy of fs superblock */ spinlock_t m_sb_lock; /* sb counter lock */ struct xfs_buf *m_sb_bp; /* buffer for superblock */ diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h index bea6e2b..7f40628 100644 --- a/fs/xfs/xfs_trans.h +++ b/fs/xfs/xfs_trans.h @@ -992,8 +992,9 @@ int _xfs_trans_commit(xfs_trans_t *, int *); #define xfs_trans_commit(tp, flags) _xfs_trans_commit(tp, flags, NULL) void xfs_trans_cancel(xfs_trans_t *, int); -void xfs_trans_ail_init(struct xfs_mount *); -xfs_lsn_t xfs_trans_push_ail(struct xfs_mount *, xfs_lsn_t); +int xfs_trans_ail_init(struct xfs_mount *); +void xfs_trans_ail_destroy(struct xfs_mount *); +void xfs_trans_push_ail(struct xfs_mount *, xfs_lsn_t); xfs_lsn_t xfs_trans_tail_ail(struct xfs_mount *); void xfs_trans_unlocked_item(struct xfs_mount *, xfs_log_item_t *); diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c index 2d3c297..7ed7425 100644 --- a/fs/xfs/xfs_trans_ail.c +++ b/fs/xfs/xfs_trans_ail.c @@ -57,7 +57,7 @@ xfs_trans_tail_ail( xfs_log_item_t *lip; spin_lock(&mp->m_ail_lock); - lip = xfs_ail_min(&(mp->m_ail)); + lip = xfs_ail_min(&(mp->m_ail.xa_ail)); if (lip == NULL) { lsn = (xfs_lsn_t)0; } else { @@ -71,119 +71,185 @@ xfs_trans_tail_ail( /* * 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. + * 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 routine returns the lsn of the tail of the log. + * 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 it's 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. */ -xfs_lsn_t +void xfs_trans_push_ail( xfs_mount_t *mp, xfs_lsn_t threshold_lsn) { - xfs_lsn_t lsn; xfs_log_item_t *lip; - int gen; - int restarts; - int lock_result; - int flush_log; -#define XFS_TRANS_PUSH_AIL_RESTARTS 1000 + lip = xfs_ail_min(&mp->m_ail.xa_ail); + if (lip && !XFS_FORCED_SHUTDOWN(mp)) { + if (XFS_LSN_CMP(threshold_lsn, mp->m_ail.xa_target) > 0) + xfsaild_wakeup(mp, threshold_lsn); + } +} + +/* + * Return the item in the AIL with the current lsn. + * Return the current tree generation number for use + * in calls to xfs_trans_next_ail(). + */ +STATIC xfs_log_item_t * +xfs_trans_first_push_ail( + xfs_mount_t *mp, + int *gen, + xfs_lsn_t lsn) +{ + xfs_log_item_t *lip; + + lip = xfs_ail_min(&(mp->m_ail.xa_ail)); + *gen = (int)mp->m_ail.xa_gen; + if (lsn == 0) + return lip; + + while (lip && (XFS_LSN_CMP(lip->li_lsn, lsn) < 0)) + lip = lip->li_ail.ail_forw; + + return lip; +} + +/* + * Function that does the work of pushing on the AIL + */ +long +xfsaild_push( + xfs_mount_t *mp, + xfs_lsn_t *last_lsn) +{ + long tout = 1000; /* milliseconds */ + xfs_lsn_t last_pushed_lsn = *last_lsn; + xfs_lsn_t target = mp->m_ail.xa_target; + xfs_lsn_t lsn; + xfs_log_item_t *lip; + int gen; + int restarts; + int flush_log, count, stuck; + +#define XFS_TRANS_PUSH_AIL_RESTARTS 10 spin_lock(&mp->m_ail_lock); - lip = xfs_trans_first_ail(mp, &gen); - if (lip == NULL || XFS_FORCED_SHUTDOWN(mp)) { + lip = xfs_trans_first_push_ail(mp, &gen, *last_lsn); + if (!lip || XFS_FORCED_SHUTDOWN(mp)) { /* - * Just return if the AIL is empty. + * AIL is empty or our push has reached the end. */ spin_unlock(&mp->m_ail_lock); - return (xfs_lsn_t)0; + last_pushed_lsn = 0; + goto out; } XFS_STATS_INC(xs_push_ail); /* * While the item we are looking at is below the given threshold - * try to flush it out. Make sure to limit the number of times - * we allow xfs_trans_next_ail() to restart scanning from the - * beginning of the list. We'd like not to stop until we've at least + * try to flush it out. We'd like not to stop until we've at least * tried to push on everything in the AIL with an LSN less than - * the given threshold. However, we may give up before that if - * we realize that we've been holding the AIL lock for 'too long', - * blocking interrupts. Currently, too long is < 500us roughly. + * the given threshold. + * + * However, we will stop after a certain number of pushes and wait + * for a reduced timeout to fire before pushing further. This + * prevents use from spinning when we can't do anything or there is + * lots of contention on the AIL lists. */ - flush_log = 0; - restarts = 0; - while (((restarts < XFS_TRANS_PUSH_AIL_RESTARTS) && - (XFS_LSN_CMP(lip->li_lsn, threshold_lsn) < 0))) { + tout = 10; + lsn = lip->li_lsn; + flush_log = stuck = count = restarts = 0; + while ((XFS_LSN_CMP(lip->li_lsn, target) < 0)) { + int lock_result; /* - * If we can lock the item without sleeping, unlock - * the AIL lock and flush the item. Then re-grab the - * AIL lock so we can look for the next item on the - * AIL. Since we unlock the AIL while we flush the - * item, the next routine may start over again at the - * the beginning of the list if anything has changed. - * That is what the generation count is for. + * If we can lock the item without sleeping, unlock the AIL + * lock and flush the item. Then re-grab the AIL lock so we + * can look for the next item on the AIL. List changes are + * handled by the AIL lookup functions internally * - * If we can't lock the item, either its holder will flush - * it or it is already being flushed or it is being relogged. - * In any of these case it is being taken care of and we - * can just skip to the next item in the list. + * If we can't lock the item, either its holder will flush it + * or it is already being flushed or it is being relogged. In + * any of these case it is being taken care of and we can just + * skip to the next item in the list. */ lock_result = IOP_TRYLOCK(lip); + spin_unlock(&mp->m_ail_lock); switch (lock_result) { - case XFS_ITEM_SUCCESS: - spin_unlock(&mp->m_ail_lock); + case XFS_ITEM_SUCCESS: XFS_STATS_INC(xs_push_ail_success); IOP_PUSH(lip); - spin_lock(&mp->m_ail_lock); + last_pushed_lsn = lsn; break; - case XFS_ITEM_PUSHBUF: - spin_unlock(&mp->m_ail_lock); + case XFS_ITEM_PUSHBUF: XFS_STATS_INC(xs_push_ail_pushbuf); -#ifdef XFSRACEDEBUG - delay_for_intr(); - delay(300); -#endif - ASSERT(lip->li_ops->iop_pushbuf); - ASSERT(lip); IOP_PUSHBUF(lip); - spin_lock(&mp->m_ail_lock); + last_pushed_lsn = lsn; break; - case XFS_ITEM_PINNED: + case XFS_ITEM_PINNED: XFS_STATS_INC(xs_push_ail_pinned); + stuck++; flush_log = 1; break; - case XFS_ITEM_LOCKED: + case XFS_ITEM_LOCKED: XFS_STATS_INC(xs_push_ail_locked); + last_pushed_lsn = lsn; + stuck++; break; - case XFS_ITEM_FLUSHING: + case XFS_ITEM_FLUSHING: XFS_STATS_INC(xs_push_ail_flushing); + last_pushed_lsn = lsn; + stuck++; break; - default: + default: ASSERT(0); break; } - lip = xfs_trans_next_ail(mp, lip, &gen, &restarts); - if (lip == NULL) { + spin_lock(&mp->m_ail_lock); + /* should we bother continuing? */ + if (XFS_FORCED_SHUTDOWN(mp)) + break; + ASSERT(mp->m_log); + + count++; + + /* + * Are there too many items we can't do anything with? + * If we we are skipping too many items because we can't flush + * them or they are already being flushed, we back off and + * given them time to complete whatever operation is being + * done. i.e. remove pressure from the AIL while we can't make + * progress so traversals don't slow down further inserts and + * removals to/from the AIL. + * + * The value of 100 is an arbitrary magic number based on + * observation. + */ + if (stuck > 100) break; - } - if (XFS_FORCED_SHUTDOWN(mp)) { - /* - * Just return if we shut down during the last try. - */ - spin_unlock(&mp->m_ail_lock); - return (xfs_lsn_t)0; - } + lip = xfs_trans_next_ail(mp, lip, &gen, &restarts); + if (lip == NULL) + break; + if (restarts > XFS_TRANS_PUSH_AIL_RESTARTS) + break; + lsn = lip->li_lsn; } + spin_unlock(&mp->m_ail_lock); if (flush_log) { /* @@ -191,22 +257,35 @@ xfs_trans_push_ail( * push out the log so it will become unpinned and * move forward in the AIL. */ - spin_unlock(&mp->m_ail_lock); XFS_STATS_INC(xs_push_ail_flush); xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE); - spin_lock(&mp->m_ail_lock); } - lip = xfs_ail_min(&(mp->m_ail)); - if (lip == NULL) { - lsn = (xfs_lsn_t)0; - } else { - lsn = lip->li_lsn; + /* + * 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)) { + tout += 20; + last_pushed_lsn = 0; + } else if ((restarts > XFS_TRANS_PUSH_AIL_RESTARTS) || + (count && ((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 + * case is defined as >90% of the items we tried to push + * were stuck. + * + * Backoff a bit more to allow some I/O to complete before + * continuing from where we were. + */ + tout += 10; } - - spin_unlock(&mp->m_ail_lock); - return lsn; -} /* xfs_trans_push_ail */ +out: + *last_lsn = last_pushed_lsn; + return tout; +} /* xfsaild_push */ /* @@ -247,7 +326,7 @@ xfs_trans_unlocked_item( * the call to xfs_log_move_tail() doesn't do anything if there's * not enough free space to wake people up so we're safe calling it. */ - min_lip = xfs_ail_min(&mp->m_ail); + min_lip = xfs_ail_min(&mp->m_ail.xa_ail); if (min_lip == lip) xfs_log_move_tail(mp, 1); @@ -279,7 +358,7 @@ xfs_trans_update_ail( xfs_log_item_t *dlip=NULL; xfs_log_item_t *mlip; /* ptr to minimum lip */ - ailp = &(mp->m_ail); + ailp = &(mp->m_ail.xa_ail); mlip = xfs_ail_min(ailp); if (lip->li_flags & XFS_LI_IN_AIL) { @@ -292,10 +371,10 @@ xfs_trans_update_ail( lip->li_lsn = lsn; xfs_ail_insert(ailp, lip); - mp->m_ail_gen++; + mp->m_ail.xa_gen++; if (mlip == dlip) { - mlip = xfs_ail_min(&(mp->m_ail)); + mlip = xfs_ail_min(&(mp->m_ail.xa_ail)); spin_unlock(&mp->m_ail_lock); xfs_log_move_tail(mp, mlip->li_lsn); } else { @@ -330,7 +409,7 @@ xfs_trans_delete_ail( xfs_log_item_t *mlip; if (lip->li_flags & XFS_LI_IN_AIL) { - ailp = &(mp->m_ail); + ailp = &(mp->m_ail.xa_ail); mlip = xfs_ail_min(ailp); dlip = xfs_ail_delete(ailp, lip); ASSERT(dlip == lip); @@ -338,10 +417,10 @@ xfs_trans_delete_ail( lip->li_flags &= ~XFS_LI_IN_AIL; lip->li_lsn = 0; - mp->m_ail_gen++; + mp->m_ail.xa_gen++; if (mlip == dlip) { - mlip = xfs_ail_min(&(mp->m_ail)); + mlip = xfs_ail_min(&(mp->m_ail.xa_ail)); spin_unlock(&mp->m_ail_lock); xfs_log_move_tail(mp, (mlip ? mlip->li_lsn : 0)); } else { @@ -379,10 +458,10 @@ xfs_trans_first_ail( { xfs_log_item_t *lip; - lip = xfs_ail_min(&(mp->m_ail)); - *gen = (int)mp->m_ail_gen; + lip = xfs_ail_min(&(mp->m_ail.xa_ail)); + *gen = (int)mp->m_ail.xa_gen; - return (lip); + return lip; } /* @@ -402,11 +481,11 @@ xfs_trans_next_ail( xfs_log_item_t *nlip; ASSERT(mp && lip && gen); - if (mp->m_ail_gen == *gen) { - nlip = xfs_ail_next(&(mp->m_ail), lip); + if (mp->m_ail.xa_gen == *gen) { + nlip = xfs_ail_next(&(mp->m_ail.xa_ail), lip); } else { - nlip = xfs_ail_min(&(mp->m_ail)); - *gen = (int)mp->m_ail_gen; + nlip = xfs_ail_min(&(mp->m_ail).xa_ail); + *gen = (int)mp->m_ail.xa_gen; if (restarts != NULL) { XFS_STATS_INC(xs_push_ail_restarts); (*restarts)++; @@ -431,12 +510,20 @@ xfs_trans_next_ail( /* * Initialize the doubly linked list to point only to itself. */ -void +int xfs_trans_ail_init( xfs_mount_t *mp) { - mp->m_ail.ail_forw = (xfs_log_item_t*)&(mp->m_ail); - mp->m_ail.ail_back = (xfs_log_item_t*)&(mp->m_ail); + mp->m_ail.xa_ail.ail_forw = (xfs_log_item_t*)&mp->m_ail.xa_ail; + mp->m_ail.xa_ail.ail_back = (xfs_log_item_t*)&mp->m_ail.xa_ail; + return xfsaild_start(mp); +} + +void +xfs_trans_ail_destroy( + xfs_mount_t *mp) +{ + xfsaild_stop(mp); } /* diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h index c40f051..3c748c4 100644 --- a/fs/xfs/xfs_trans_priv.h +++ b/fs/xfs/xfs_trans_priv.h @@ -57,4 +57,12 @@ struct xfs_log_item *xfs_trans_next_ail(struct xfs_mount *, struct xfs_log_item *, int *, int *); +/* + * AIL push thread support + */ +long xfsaild_push(struct xfs_mount *, xfs_lsn_t *); +void xfsaild_wakeup(struct xfs_mount *, xfs_lsn_t); +int xfsaild_start(struct xfs_mount *); +void xfsaild_stop(struct xfs_mount *); + #endif /* __XFS_TRANS_PRIV_H__ */ |
