Btrfs: reduce size of struct extent_state

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The tree field of struct extent_state was only used to figure out if
an extent state was connected to an inode's io tree or not. For this
we can just use the rb_node field itself.

On a x86_64 system with this change the sizeof(struct extent_state) is
reduced from 96 bytes down to 88 bytes, meaning that with a page size
of 4096 bytes we can now store 46 extent states per page instead of 42.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

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Filipe Manana 2014-07-06 20:09:59 +01:00 • committed by Chris Mason

parent 6f84e23646

commit 27a3507de9

2 changed files with 20 additions and 18 deletions

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37

fs/btrfs/extent_io.c

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1

fs/btrfs/extent_io.h

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