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authorTheodore Ts'o <tytso@mit.edu>2006-09-27 01:50:31 -0700
committerSteven Whitehouse <swhiteho@redhat.com>2006-09-28 08:32:24 -0400
commitbba9dfd83587017de1c55a94c077983e0dfa0251 (patch)
tree8af76134269374850dea490ee1020cb92f4fdb9b /arch/i386/defconfig
parent185a257f2f73bcd89050ad02da5bedbc28fc43fa (diff)
[GFS2] inode_diet: Replace inode.u.generic_ip with inode.i_private (gfs)
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. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org>
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