A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-30 19:51:31 -04:00
Code Issues Projects Releases Packages Wiki Activity

[PATCH] inode_diet: Replace inode.u.generic_ip with inode.i_private

Browse source 
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.

[[email protected]: powerpc build fix]
Signed-off-by: "Theodore Ts'o" <[email protected]>
Signed-off-by: Judith Lebzelter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Theodore Ts'o 2006-09-27 01:50:46 -07:00 • committed by Linus Torvalds
commit 8e18e2941c
36 changed files with 88 additions and 90 deletions
Download patch file Download diff file Expand all files Collapse all files

2
fs/freevxfs/vxfs.h
View file

@ -252,7 +252,7 @@ enum {
* Get filesystem private data from VFS inode.
*/
#define VXFS_INO(ip) \
((struct vxfs_inode_info *)(ip)->u.generic_ip)
((struct vxfs_inode_info *)(ip)->i_private)
/*
* Get filesystem private data from VFS superblock.

4
fs/freevxfs/vxfs_inode.c
View file

@ -243,7 +243,7 @@ vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
ip->i_blocks = vip->vii_blocks;
ip->i_generation = vip->vii_gen;
ip->u.generic_ip = (void *)vip;
ip->i_private = vip;
}
@ -338,5 +338,5 @@ vxfs_read_inode(struct inode *ip)
void
vxfs_clear_inode(struct inode *ip)
{
kmem_cache_free(vxfs_inode_cachep, ip->u.generic_ip);
kmem_cache_free(vxfs_inode_cachep, ip->i_private);
}