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author | Theodore Ts'o <tytso@mit.edu> | 2006-09-27 08:50:46 (GMT) |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-27 15:26:17 (GMT) |
commit | 8e18e2941c53416aa219708e7dcad21fb4bd6794 (patch) | |
tree | 44118f8b09556193ac93e0b71aecfa3e1d4bc182 /include/linux/fs.h | |
parent | 6a1d9805ec506d8b9d04450997707da5f643d87c (diff) | |
download | linux-fsl-qoriq-8e18e2941c53416aa219708e7dcad21fb4bd6794.tar.xz |
[PATCH] inode_diet: Replace inode.u.generic_ip with inode.i_private
The following patches reduce the size of the VFS inode structure by 28 bytes
on a UP x86. (It would be more on an x86_64 system). This is a 10% reduction
in the inode size on a UP kernel that is configured in a production mode
(i.e., with no spinlock or other debugging functions enabled; if you want to
save memory taken up by in-core inodes, the first thing you should do is
disable the debugging options; they are responsible for a huge amount of bloat
in the VFS inode structure).
This patch:
The filesystem or device-specific pointer in the inode is inside a union,
which is pretty pointless given that all 30+ users of this field have been
using the void pointer. Get rid of the union and rename it to i_private, with
a comment to explain who is allowed to use the void pointer. This is just a
cleanup, but it allows us to reuse the union 'u' for something something where
the union will actually be used.
[judith@osdl.org: powerpc build fix]
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Judith Lebzelter <judith@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/fs.h')
-rw-r--r-- | include/linux/fs.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 1d3e601..4f77ec9 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -554,9 +554,7 @@ struct inode { atomic_t i_writecount; void *i_security; - union { - void *generic_ip; - } u; + void *i_private; /* fs or device private pointer */ #ifdef __NEED_I_SIZE_ORDERED seqcount_t i_size_seqcount; #endif |