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authorDavid Chinner <dgc@sgi.com>2008-03-05 21:43:49 -0500
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-04-17 21:37:41 -0400
commitbad5584332e888ac40ca13584e8c114149ddb01e (patch)
treef66ff83686cd28967d8b9fc0a8b8d6411a081071 /sound
parenta3f74ffb6d1448d9a8f482e593b80ec15f1695d4 (diff)
[XFS] Remove the xfs_icluster structure
Remove the xfs_icluster structure and replace with a radix tree lookup. We don't need to keep a list of inodes in each cluster around anymore as we can look them up quickly when we need to. The only time we need to do this now is during inode writeback. Factor the inode cluster writeback code out of xfs_iflush and convert it to use radix_tree_gang_lookup() instead of walking a list of inodes built when we first read in the inodes. This remove 3 pointers from each xfs_inode structure and the xfs_icluster structure per inode cluster. Hence we reduce the cache footprint of the xfs_inodes by between 5-10% depending on cluster sparseness. To be truly efficient we need a radix_tree_gang_lookup_range() call to stop searching once we are past the end of the cluster instead of trying to find a full cluster's worth of inodes. Before (ia64): $ cat /sys/slab/xfs_inode/object_size 536 After: $ cat /sys/slab/xfs_inode/object_size 512 SGI-PV: 977460 SGI-Modid: xfs-linux-melb:xfs-kern:30502a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'sound')
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