ocfs2: Optimize inode group allocation by recording last used group.

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In ocfs2, the block group search looks for the "emptiest" group
to allocate from. So if the allocator has many equally(or almost
equally) empty groups, new block group will tend to get spread
out amongst them.

So we add osb_inode_alloc_group in ocfs2_super to record the last
used inode allocation group.
For more details, please see
http://oss.oracle.com/osswiki/OCFS2/DesignDocs/InodeAllocationStrategy.

I have done some basic test and the results are a ten times improvement on
some cold-cache stat workloads.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

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Tao Ma 2009-02-25 00:53:25 +08:00 • committed by Mark Fasheh

parent 60ca81e82d

commit feb473a6e8

2 changed files with 31 additions and 4 deletions

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3

fs/ocfs2/ocfs2.h

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32

fs/ocfs2/suballoc.c

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