diff options
| author |   Alex Lyakas <alex@zadarastorage.com> | 2016-05-18 14:01:52 +1000 |
|---|---|---|
| committer |   Dave Chinner <david@fromorbit.com> | 2016-05-18 14:01:52 +1000 |
| commit | 32b43ab6fb983e5a117048443e628c235cd2c5bd (patch) | |
| tree | c953aa9cfd4ab662cbccbdd649238a0ea5cf7c79 /fs/xfs | |
| parent | xfs: skip stale inodes in xfs_iflush_cluster (diff) | |
| download | wireguard-linux-32b43ab6fb983e5a117048443e628c235cd2c5bd.tar.xz wireguard-linux-32b43ab6fb983e5a117048443e628c235cd2c5bd.zip | |
xfs: optimise xfs_iext_destroy
When unmounting XFS, we call:
xfs_inode_free => xfs_idestroy_fork => xfs_iext_destroy
This goes over the whole indirection array and calls
xfs_iext_irec_remove for each one of the erps (from the last one to
the first one). As a result, we keep shrinking (reallocating
actually) the indirection array until we shrink out all of its
elements. When we have files with huge numbers of extents, umount
takes 30-80 sec, depending on the amount of files that XFS loaded
and the amount of indirection entries of each file. The unmount
stack looks like:
[<ffffffffc0b6d200>] xfs_iext_realloc_indirect+0x40/0x60 [xfs]
[<ffffffffc0b6cd8e>] xfs_iext_irec_remove+0xee/0xf0 [xfs]
[<ffffffffc0b6cdcd>] xfs_iext_destroy+0x3d/0xb0 [xfs]
[<ffffffffc0b6cef6>] xfs_idestroy_fork+0xb6/0xf0 [xfs]
[<ffffffffc0b87002>] xfs_inode_free+0xb2/0xc0 [xfs]
[<ffffffffc0b87260>] xfs_reclaim_inode+0x250/0x340 [xfs]
[<ffffffffc0b87583>] xfs_reclaim_inodes_ag+0x233/0x370 [xfs]
[<ffffffffc0b8823d>] xfs_reclaim_inodes+0x1d/0x20 [xfs]
[<ffffffffc0b96feb>] xfs_unmountfs+0x7b/0x1a0 [xfs]
[<ffffffffc0b98e4d>] xfs_fs_put_super+0x2d/0x70 [xfs]
[<ffffffff811e9e36>] generic_shutdown_super+0x76/0x100
[<ffffffff811ea207>] kill_block_super+0x27/0x70
[<ffffffff811ea519>] deactivate_locked_super+0x49/0x60
[<ffffffff811eaaee>] deactivate_super+0x4e/0x70
[<ffffffff81207593>] cleanup_mnt+0x43/0x90
[<ffffffff81207632>] __cleanup_mnt+0x12/0x20
[<ffffffff8108f8e7>] task_work_run+0xa7/0xe0
[<ffffffff81014ff7>] do_notify_resume+0x97/0xb0
[<ffffffff81717c6f>] int_signal+0x12/0x17
Further, this reallocation prevents us from freeing the extent list
from a RCU callback as allocation can block. Hence if the extent
list is in indirect format, optimise the freeing of the extent list
to only use kmem_free calls by freeing entire extent buffer pages at
a time, rather than extent by extent.
[dchinner: simplified freeing loop based on Christoph's suggestion]
Signed-off-by: Alex Lyakas <alex@zadarastorage.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs')
| -rw-r--r-- | fs/xfs/libxfs/xfs_inode_fork.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c index 11faf7df14c8..8fe6617a8653 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.c +++ b/fs/xfs/libxfs/xfs_inode_fork.c @@ -1497,6 +1497,24 @@ xfs_iext_indirect_to_direct( } /* + * Remove all records from the indirection array. + */ +STATIC void +xfs_iext_irec_remove_all( + struct xfs_ifork *ifp) +{ + int nlists; + int i; + + ASSERT(ifp->if_flags & XFS_IFEXTIREC); + nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; + for (i = 0; i < nlists; i++) + kmem_free(ifp->if_u1.if_ext_irec[i].er_extbuf); + kmem_free(ifp->if_u1.if_ext_irec); + ifp->if_flags &= ~XFS_IFEXTIREC; +} + +/* * Free incore file extents. */ void @@ -1504,14 +1522,7 @@ xfs_iext_destroy( xfs_ifork_t *ifp) /* inode fork pointer */ { if (ifp->if_flags & XFS_IFEXTIREC) { - int erp_idx; - int nlists; - - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - for (erp_idx = nlists - 1; erp_idx >= 0 ; erp_idx--) { - xfs_iext_irec_remove(ifp, erp_idx); - } - ifp->if_flags &= ~XFS_IFEXTIREC; + xfs_iext_irec_remove_all(ifp); } else if (ifp->if_real_bytes) { kmem_free(ifp->if_u1.if_extents); } else if (ifp->if_bytes) { |