From 7eae68f6dd62cfd779c260c2f5500dbc64cc95ca Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Fri, 1 Oct 2010 07:43:54 +0000 Subject: [PATCH] xfs: properly account for reclaimed inodes commit 081003fff467ea0e727f66d5d435b4f473a789b3 upstream. When marking an inode reclaimable, a per-AG counter is increased, the inode is tagged reclaimable in its per-AG tree, and, when this is the first reclaimable inode in the AG, the AG entry in the per-mount tree is also tagged. When an inode is finally reclaimed, however, it is only deleted from the per-AG tree. Neither the counter is decreased, nor is the parent tree's AG entry untagged properly. Since the tags in the per-mount tree are not cleared, the inode shrinker iterates over all AGs that have had reclaimable inodes at one point in time. The counters on the other hand signal an increasing amount of slab objects to reclaim. Since "70e60ce xfs: convert inode shrinker to per-filesystem context" this is not a real issue anymore because the shrinker bails out after one iteration. But the problem was observable on a machine running v2.6.34, where the reclaimable work increased and each process going into direct reclaim eventually got stuck on the xfs inode shrinking path, trying to scan several million objects. Fix this by properly unwinding the reclaimable-state tracking of an inode when it is reclaimed. Signed-off-by: Johannes Weiner Reviewed-by: Dave Chinner Signed-off-by: Alex Elder Backported-by: Stefan Priebe Signed-off-by: Greg Kroah-Hartman --- fs/xfs/linux-2.6/xfs_sync.c | 16 ++++++++++++---- fs/xfs/linux-2.6/xfs_sync.h | 1 + fs/xfs/xfs_iget.c | 1 + 3 files changed, 14 insertions(+), 4 deletions(-) diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c index c82683ad148..71c14dde069 100644 --- a/fs/xfs/linux-2.6/xfs_sync.c +++ b/fs/xfs/linux-2.6/xfs_sync.c @@ -711,16 +711,24 @@ xfs_inode_set_reclaim_tag( } void -__xfs_inode_clear_reclaim_tag( - xfs_mount_t *mp, +__xfs_inode_clear_reclaim( xfs_perag_t *pag, xfs_inode_t *ip) { - radix_tree_tag_clear(&pag->pag_ici_root, - XFS_INO_TO_AGINO(mp, ip->i_ino), XFS_ICI_RECLAIM_TAG); pag->pag_ici_reclaimable--; } +void +__xfs_inode_clear_reclaim_tag( + xfs_mount_t *mp, + xfs_perag_t *pag, + xfs_inode_t *ip) +{ + radix_tree_tag_clear(&pag->pag_ici_root, + XFS_INO_TO_AGINO(mp, ip->i_ino), XFS_ICI_RECLAIM_TAG); + __xfs_inode_clear_reclaim(pag, ip); +} + STATIC int xfs_reclaim_inode( struct xfs_inode *ip, diff --git a/fs/xfs/linux-2.6/xfs_sync.h b/fs/xfs/linux-2.6/xfs_sync.h index 0b28c13bdf9..81dd3bcb8d9 100644 --- a/fs/xfs/linux-2.6/xfs_sync.h +++ b/fs/xfs/linux-2.6/xfs_sync.h @@ -48,6 +48,7 @@ int xfs_reclaim_inodes(struct xfs_mount *mp, int mode); void xfs_inode_set_reclaim_tag(struct xfs_inode *ip); void __xfs_inode_set_reclaim_tag(struct xfs_perag *pag, struct xfs_inode *ip); +void __xfs_inode_clear_reclaim(struct xfs_perag *pag, struct xfs_inode *ip); void __xfs_inode_clear_reclaim_tag(struct xfs_mount *mp, struct xfs_perag *pag, struct xfs_inode *ip); diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c index 16b6a3326c9..320b79df69e 100644 --- a/fs/xfs/xfs_iget.c +++ b/fs/xfs/xfs_iget.c @@ -529,6 +529,7 @@ xfs_ireclaim( write_lock(&pag->pag_ici_lock); if (!radix_tree_delete(&pag->pag_ici_root, agino)) ASSERT(0); + __xfs_inode_clear_reclaim(pag, ip); write_unlock(&pag->pag_ici_lock); xfs_put_perag(mp, pag); -- 2.11.4.GIT