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    • Theodore Ts'o's avatar
      [PATCH] inode_diet: Replace inode.u.generic_ip with inode.i_private · 8e18e294
      Theodore Ts'o authored
      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: default avatar"Theodore Ts'o" <tytso@mit.edu>
      Signed-off-by: default avatarJudith Lebzelter <judith@osdl.org>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      8e18e294
  19. 23 Mar, 2006 3 commits