linux/fs/xfs/linux-2.6
Johannes Weiner 081003fff4 xfs: properly account for reclaimed inodes
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 <hannes@cmpxchg.org>
Cc: stable@kernel.org
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
2010-10-06 22:35:48 -05:00
..
kmem.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
kmem.h xfs: replace KM_LARGE with explicit vmalloc use 2010-01-21 13:44:56 -06:00
mrlock.h
sv.h remove dead code from sv_t implementation 2008-12-04 15:39:21 +11:00
time.h
xfs_acl.c xfs: split xfs_itrace_entry 2010-07-26 13:16:44 -05:00
xfs_aops.c xfs: do not discard page cache data on EAGAIN 2010-08-24 11:47:51 +10:00
xfs_aops.h direct-io: move aio_complete into ->end_io 2010-07-26 16:09:02 -05:00
xfs_buf.c xfs: log IO completion workqueue is a high priority queue 2010-09-10 10:16:54 -05:00
xfs_buf.h xfs: improve buffer cache hash scalability 2010-09-02 15:14:38 +10:00
xfs_cred.h [XFS] Fix merge failures 2008-12-29 16:47:18 +11:00
xfs_export.c xfs: remove xfs_iput_new 2010-07-26 13:16:44 -05:00
xfs_export.h
xfs_file.c xfs: remove a dmapi leftover 2010-07-26 13:16:47 -05:00
xfs_fs_subr.c xfs: drop dmapi hooks 2010-07-26 13:16:33 -05:00
xfs_globals.c [XFS] remove restricted chown parameter from xfs linux 2008-10-30 18:30:48 +11:00
xfs_globals.h CRED: Separate task security context from task_struct 2008-11-14 10:39:16 +11:00
xfs_ioctl.c xfs: prevent reading uninitialized stack memory 2010-09-10 07:39:28 -05:00
xfs_ioctl.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_ioctl32.c xfs: split xfs_itrace_entry 2010-07-26 13:16:44 -05:00
xfs_ioctl32.h [XFS] fix compile on 32 bit systems 2008-12-04 13:07:29 +11:00
xfs_iops.c xfs: Make fiemap work with sparse files 2010-09-03 09:02:11 -05:00
xfs_iops.h [XFS] add a FMODE flag to make XFS invisible I/O less hacky 2008-12-11 13:14:41 +11:00
xfs_linux.h xfs: new truncate sequence 2010-08-09 16:47:42 -04:00
xfs_quotaops.c Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-08-07 12:57:07 -07:00
xfs_stats.c xfs: switch to seq_file 2009-09-15 12:29:24 -05:00
xfs_stats.h [XFS] add new btree statistics 2008-10-30 16:55:03 +11:00
xfs_super.c xfs: dummy transactions should not dirty VFS state 2010-08-24 11:46:31 +10:00
xfs_super.h xfs: drop dmapi hooks 2010-07-26 13:16:33 -05:00
xfs_sync.c xfs: properly account for reclaimed inodes 2010-10-06 22:35:48 -05:00
xfs_sync.h xfs: remove explicit xfs_sync_data/xfs_sync_attr calls on umount 2010-07-26 13:16:42 -05:00
xfs_sysctl.c sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
xfs_sysctl.h [XFS] remove restricted chown parameter from xfs linux 2008-10-30 18:30:48 +11:00
xfs_trace.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_trace.h convert remaining ->clear_inode() to ->evict_inode() 2010-08-09 16:48:37 -04:00
xfs_version.h
xfs_vnode.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_xattr.c xfs: constify xattr_handler 2010-05-21 18:31:19 -04:00