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Nick Piggin c28cc36469 fs: fs_struct use seqlock 
Use a seqlock in the fs_struct to enable us to take an atomic copy of the
complete cwd and root paths. Use this in the RCU lookup path to avoid a
thread-shared spinlock in RCU lookup operations.

Multi-threaded apps may now perform path lookups with scalability matching
multi-process apps. Operations such as stat(2) become very scalable for
multi-threaded workload.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07 17:50:27 +11:00
..
9p fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
adfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
affs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
afs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
autofs4 fs: dcache remove dcache_lock 2011-01-07 17:50:23 +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: icache RCU free inodes 2011-01-07 17:50:26 +11:00
cachefiles
ceph fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
cifs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
coda fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
configfs fs: dcache rationalise dget variants 2011-01-07 17:50:24 +11:00
cramfs
debugfs
devpts
dlm
ecryptfs fs: icache RCU free inodes 2011-01-07 17:50:26 +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: icache RCU free inodes 2011-01-07 17:50:26 +11:00
freevxfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
fscache
fuse fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
gfs2 fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
hfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
hfsplus fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
hostfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
hpfs fs: icache RCU free inodes 2011-01-07 17:50:26 +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: icache RCU free inodes 2011-01-07 17:50:26 +11:00
jbd
jbd2
jffs2 fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
jfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
lockd
logfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
minix fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
ncpfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
nfs fs: icache RCU free inodes 2011-01-07 17:50:26 +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: icache RCU free inodes 2011-01-07 17:50:26 +11:00
omfs
openpromfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
partitions
proc fs: rcu-walk for path lookup 2011-01-07 17:50:27 +11:00
qnx4 fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
quota
ramfs
reiserfs fs: icache RCU free inodes 2011-01-07 17:50:26 +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
sysv fs: icache RCU free inodes 2011-01-07 17:50:26 +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
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf.c
binfmt_elf_fdpic.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c
block_dev.c fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
buffer.c
char_dev.c
compat.c
compat_binfmt_elf.c
compat_ioctl.c
dcache.c fs: rcu-walk for path lookup 2011-01-07 17:50:27 +11:00
dcookies.c
direct-io.c
drop_caches.c
eventfd.c
eventpoll.c
exec.c
fcntl.c
fifo.c
file.c
file_table.c
filesystems.c fs: rcu-walk for path lookup 2011-01-07 17:50:27 +11:00
fs-writeback.c
fs_struct.c fs: fs_struct use seqlock 2011-01-07 17:50:27 +11:00
generic_acl.c
inode.c fs: avoid inode RCU freeing for pseudo fs 2011-01-07 17:50:26 +11:00
internal.h
ioctl.c
ioprio.c
Kconfig
Kconfig.binfmt
libfs.c fs: dcache remove dcache_lock 2011-01-07 17:50:23 +11:00
locks.c fs: dcache scale dentry refcount 2011-01-07 17:50:21 +11:00
Makefile
mbcache.c
mpage.c
namei.c fs: fs_struct use seqlock 2011-01-07 17:50:27 +11:00
namespace.c
nfsctl.c
no-block.c
open.c
pipe.c fs: avoid inode RCU freeing for pseudo fs 2011-01-07 17:50:26 +11:00
pnode.c
pnode.h
posix_acl.c
read_write.c
read_write.h
readdir.c
select.c
seq_file.c
signalfd.c
splice.c
stack.c
stat.c
statfs.c
super.c
sync.c
timerfd.c
utimes.c
xattr.c
xattr_acl.c