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44a7d7a878
kernel_optimize_test/fs
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Nick Piggin 44a7d7a878 fs: cache optimise dentry and inode for rcu-walk 
Put dentry and inode fields into top of data structure.  This allows RCU path
traversal to perform an RCU dentry lookup in a path walk by touching only the
first 56 bytes of the dentry.

We also fit in 8 bytes of inline name in the first 64 bytes, so for short
names, only 64 bytes needs to be touched to perform the lookup. We should
get rid of the hash->prev pointer from the first 64 bytes, and fit 16 bytes
of name in there, which will take care of 81% rather than 32% of the kernel
tree.

inode is also rearranged so that RCU lookup will only touch a single cacheline
in the inode, plus one in the i_ops structure.

This is important for directory component lookups in RCU path walking. In the
kernel source, directory names average is around 6 chars, so this works.

When we reach the last element of the lookup, we need to lock it and take its
refcount which requires another cacheline access.

Align dentry and inode operations structs, so members will be at predictable
offsets and we can group common operations into head of structure.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07 17:50:28 +11:00
..
9p fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
adfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
affs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
afs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
autofs4 fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
befs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
bfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
btrfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
cachefiles llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
ceph fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
cifs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
coda fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
configfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
cramfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
debugfs convert get_sb_single() users 2010-10-29 04:16:28 -04:00
devpts convert get_sb_single() users 2010-10-29 04:16:28 -04:00
dlm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm 2010-10-22 17:33:16 -07:00
ecryptfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
efs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
exofs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
exportfs fs: dcache rationalise dget variants 2011-01-07 17:50:24 +11:00
ext2 fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
ext3 fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
ext4 fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
fat fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
freevxfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
fscache Add a dummy printk function for the maintenance of unused printks 2010-08-12 09:51:35 -07:00
fuse fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
gfs2 fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
hfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
hfsplus fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
hostfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
hpfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
hppfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
hugetlbfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
isofs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
jbd Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-10-27 20:13:18 -07:00
jbd2 jbd2: fix /proc/fs/jbd2/<dev> when using an external journal 2010-11-17 21:46:26 -05:00
jffs2 fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
jfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
lockd BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
logfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
minix fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
ncpfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
nfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
nfs_common
nfsd fs: dcache scale dentry refcount 2011-01-07 17:50:21 +11:00
nilfs2 fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
nls
notify fs: dcache remove dcache_lock 2011-01-07 17:50:23 +11:00
ntfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
ocfs2 fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
omfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
openpromfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
partitions Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2010-10-25 07:45:10 -07:00
proc fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
qnx4 fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
quota quota: Fix possible oops in __dquot_initialize() 2010-10-28 01:30:06 +02:00
ramfs convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
reiserfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
romfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
squashfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
sysfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
sysv fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
ubifs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
udf fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
ufs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
xfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
aio.c new helper: ihold() 2010-10-25 21:26:11 -04:00
anon_inodes.c fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
attr.c
bad_inode.c bkl: Remove locked .ioctl file operation 2010-08-14 00:24:24 +02:00
binfmt_aout.c Don't dump task struct in a.out core-dumps 2010-10-14 10:57:40 -07:00
binfmt_elf_fdpic.c
binfmt_elf.c ARM: 6342/1: fix ASLR of PIE executables 2010-10-08 10:02:53 +01:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c convert get_sb_single() users 2010-10-29 04:16:28 -04:00
binfmt_script.c Make do_execve() take a const filename pointer 2010-08-17 18:07:43 -07:00
binfmt_som.c
bio-integrity.c fs/bio-integrity.c: return -ENOMEM on kmalloc failure 2010-08-23 13:36:59 +02:00
bio.c bio: take care not overflow page count when mapping/copying user data 2010-11-10 14:40:43 +01:00
block_dev.c fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
buffer.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-10-26 17:58:44 -07:00
char_dev.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
compat_binfmt_elf.c
compat_ioctl.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
compat.c exec: copy-and-paste the fixes into compat_do_execve() paths 2010-11-30 17:56:38 -08:00
dcache.c fs: cache optimise dentry and inode for rcu-walk 2011-01-07 17:50:28 +11:00
dcookies.c
direct-io.c fs/direct-io.c: fix truncation error in dio_complete() return 2010-10-26 16:52:13 -07:00
drop_caches.c
eventfd.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
eventpoll.c epoll: make epoll_wait() use the hrtimer range feature 2010-10-27 18:03:18 -07:00
exec.c install_special_mapping skips security_file_mmap check. 2010-12-15 12:30:36 -08:00
fcntl.c fasync: Fix placement of FASYNC flag comment 2010-10-27 18:17:02 -07:00
fifo.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
file_table.c fs: allow for more than 2^31 files 2010-10-26 16:52:15 -07:00
file.c vfs: use kmalloc() to allocate fdmem if possible 2010-08-11 08:59:02 -07:00
filesystems.c fs: rcu-walk for path lookup 2011-01-07 17:50:27 +11:00
fs_struct.c fs: fs_struct use seqlock 2011-01-07 17:50:27 +11:00
fs-writeback.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2010-10-30 09:05:48 -07:00
generic_acl.c vfs: update ctime when changing the file's permission by setfacl 2010-08-18 01:04:22 -04:00
inode.c fs: avoid inode RCU freeing for pseudo fs 2011-01-07 17:50:26 +11:00
internal.h braino in internal.h 2010-10-29 05:49:13 -04:00
ioctl.c Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 2010-11-19 19:46:45 -08:00
ioprio.c ioprio: grab rcu_read_lock in sys_ioprio_{set,get}() 2010-11-15 10:23:31 +01:00
Kconfig Merge 'staging-next' to Linus's tree 2010-10-28 09:44:56 -07:00
Kconfig.binfmt coredump: default CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y 2010-10-27 18:03:12 -07:00
libfs.c fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
locks.c fs: dcache scale dentry refcount 2011-01-07 17:50:21 +11:00
Makefile Merge 'staging-next' to Linus's tree 2010-10-28 09:44:56 -07:00
mbcache.c mbcache: Limit the maximum number of cache entries 2010-08-18 06:24:41 -04:00
mpage.c
namei.c fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
namespace.c fs: dcache remove d_mounted 2011-01-07 17:50:28 +11:00
nfsctl.c
no-block.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
open.c fix open/umount race 2010-10-29 04:14:56 -04:00
pipe.c fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
pnode.c fs: brlock vfsmount_lock 2010-08-18 08:35:48 -04:00
pnode.h
posix_acl.c
read_write.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
read_write.h
readdir.c vfs: fix warning: 'dirent' is used uninitialized in this function 2010-08-09 20:45:05 -07:00
select.c epoll: make epoll_wait() use the hrtimer range feature 2010-10-27 18:03:18 -07:00
seq_file.c fs: take dcache_lock inside __d_path 2010-10-25 21:26:12 -04:00
signalfd.c Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6 2010-10-26 10:13:10 -07:00
splice.c Export 'get_pipe_info()' to other users 2010-11-28 14:09:57 -08:00
stack.c
stat.c Mark arguments to certain syscalls as being const 2010-08-13 16:53:13 -07:00
statfs.c
super.c switch get_sb_ns() users 2010-10-29 04:17:03 -04:00
sync.c
timerfd.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
utimes.c Mark arguments to certain syscalls as being const 2010-08-13 16:53:13 -07:00
xattr_acl.c
xattr.c