npiggin@suse.de d3ef3d7351 fs: mnt_want_write speedup ... This patch speeds up lmbench lat_mmap test by about 8%. lat_mmap is set up basically to mmap a 64MB file on tmpfs, fault in its pages, then unmap it. A microbenchmark yes, but it exercises some important paths in the mm. Before: avg = 501.9 std = 14.7773 After: avg = 462.286 std = 5.46106 (50 runs of each, stddev gives a reasonable confidence, but there is quite a bit of variation there still) It does this by removing the complex per-cpu locking and counter-cache and replaces it with a percpu counter in struct vfsmount. This makes the code much simpler, and avoids spinlocks (although the msync is still pretty costly, unfortunately). It results in about 900 bytes smaller code too. It does increase the size of a vfsmount, however. It should also give a speedup on large systems if CPUs are frequently operating on different mounts (because the existing scheme has to operate on an atomic in the struct vfsmount when switching between mounts). But I'm most interested in the single threaded path performance for the moment. [AV: minor cleanup] Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>		2009-06-11 21:36:02 -04:00
..
9p	Fix a leak in failure exit in 9p ->get_sb()	2009-05-09 10:49:40 -04:00
adfs
affs	Fix races around the access to ->s_options	2009-05-09 10:51:34 -04:00
afs	switch follow_down()	2009-06-11 21:36:01 -04:00
autofs	switch follow_down()	2009-06-11 21:36:01 -04:00
autofs4	switch follow_down()	2009-06-11 21:36:01 -04:00
befs	befs: fix build on parisc	2009-04-08 10:21:43 -07:00
bfs
btrfs	Btrfs: fix extent_buffer leak during tree log replay	2009-06-11 11:24:47 -04:00
cachefiles	CacheFiles: Fixup renamed filenames in comments in internal.h	2009-05-27 10:20:13 -07:00
cifs	switch follow_down()	2009-06-11 21:36:01 -04:00
coda	splice: implement default splice_read method	2009-05-11 14:13:10 +02:00
configfs	configfs: Fix Trivial Warning in fs/configfs/symlink.c	2009-04-21 12:59:21 -07:00
cramfs
debugfs
devpts	devpts: unregister the file system on error	2009-06-11 08:51:06 -07:00
dlm
ecryptfs	Convert obvious places to deactivate_locked_super()	2009-05-09 10:49:40 -04:00
efs
exofs	block: add rq->resid_len	2009-05-11 09:50:53 +02:00
exportfs
ext2	ext2: Fix memory leak in ext2_fill_super() in case of a failed mount	2009-05-17 23:52:51 -04:00
ext3	Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block	2009-06-11 11:10:35 -07:00
ext4	Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block	2009-06-11 11:10:35 -07:00
fat	vfat: Note the NLS requirement	2009-04-17 09:32:11 -07:00
freevxfs
fscache	FS-Cache: Fixup renamed filenames in comments in internal.h	2009-05-27 10:20:13 -07:00
fuse	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse	2009-05-13 16:32:57 -07:00
gfs2	Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block	2009-06-11 11:10:35 -07:00
hfs	hfs: fix memory leak when unmounting	2009-04-13 15:04:29 -07:00
hfsplus
hostfs
hpfs	Fix races around the access to ->s_options	2009-05-09 10:51:34 -04:00
hppfs
hugetlbfs	Merge branch 'master' into next	2009-05-22 18:40:59 +10:00
isofs
jbd	jbd: fix race in buffer processing in commit code	2009-06-09 16:59:03 -07:00
jbd2	jbd2: Fix minor typos in comments in fs/jbd2/journal.c	2009-06-09 00:06:20 -04:00
jffs2	jffs2: Fix corruption when flash erase/write failure	2009-05-29 10:44:46 +01:00
jfs	jfs: Add missing mutex_unlock call to error path	2009-05-23 20:28:41 -05:00
lockd	lockd: fix list corruption on lockd restart	2009-05-06 17:19:36 -04:00
minix
ncpfs	ncpfs: use memdup_user()	2009-04-20 23:02:51 -04:00
nfs	switch follow_down()	2009-06-11 21:36:01 -04:00
nfs_common
nfsd	switch follow_down()	2009-06-11 21:36:01 -04:00
nilfs2	Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block	2009-06-11 11:10:35 -07:00
nls
notify	fsnotify: allow groups to set freeing_mark to null	2009-06-11 14:57:55 -04:00
ntfs	block: Do away with the notion of hardsect_size	2009-05-22 23:22:54 +02:00
ocfs2	block: Do away with the notion of hardsect_size	2009-05-22 23:22:54 +02:00
omfs
openpromfs
partitions	block: Export I/O topology for block devices and partitions	2009-05-22 23:22:55 +02:00
proc	Move junk from proc_fs.h to fs/proc/internal.h	2009-06-11 21:36:01 -04:00
qnx4
quota	quota: remove obsolete comments in fs/quota/Makefile	2009-04-27 16:49:52 +02:00
ramfs
reiserfs	reiserfs: allow exposing privroot w/ xattrs enabled	2009-06-11 21:35:58 -04:00
romfs	ROMFS: romfs_dev_read() error ignored	2009-05-09 10:49:41 -04:00
smbfs
squashfs	Squashfs: cody tidying, remove commented out line in Makefile	2009-05-13 03:25:20 +01:00
sysfs	sysfs: file.c: use create_singlethread_workqueue()	2009-05-28 14:24:07 -07:00
sysv
ubifs	Convert obvious places to deactivate_locked_super()	2009-05-09 10:49:40 -04:00
udf	block: Do away with the notion of hardsect_size	2009-05-22 23:22:54 +02:00
ufs	switch ufs directories to ufs_sync_file()	2009-05-09 10:49:42 -04:00
xfs	Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block	2009-06-11 11:10:35 -07:00
aio.c
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c	ptrace: s/parent/real_parent/ in binfmt_elf_fdpic.c	2009-05-02 15:36:10 -07:00
binfmt_elf.c
binfmt_em86.c
binfmt_flat.c	flat: fix data sections alignment	2009-05-29 08:40:02 -07:00
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c	Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block	2009-06-11 11:10:35 -07:00
block_dev.c	Merge branch 'for-linus' of git://linux-arm.org/linux-2.6	2009-06-11 14:15:57 -07:00
buffer.c	Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block	2009-06-11 11:10:35 -07:00
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c	fs/compat_ioctl: fix build when !BLOCK	2009-04-20 23:01:16 -04:00
compat.c	CRED: Rename cred_exec_mutex to reflect that it's a guard against ptrace	2009-05-11 08:15:36 +10:00
dcache.c	fs: dcache fix LRU ordering	2009-05-09 10:49:40 -04:00
dcookies.c
direct-io.c	block: Do away with the notion of hardsect_size	2009-05-22 23:22:54 +02:00
drop_caches.c
eventfd.c
eventpoll.c	epoll: fix size check in epoll_create()	2009-05-12 14:11:35 -07:00
exec.c	Merge branch 'perfcounters-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-06-11 14:01:07 -07:00
fcntl.c	dup2: Fix return value with oldfd == newfd and invalid fd	2009-05-11 12:18:06 -07:00
fifo.c
file_table.c
file.c
filesystems.c	fs: Mark get_filesystem_list() as __init function.	2009-04-20 23:02:52 -04:00
fs_struct.c
fs-writeback.c
generic_acl.c
inode.c	fsnotify: handle filesystem unmounts with fsnotify marks	2009-06-11 14:57:54 -04:00
internal.h
ioctl.c	fiemap: fix problem with setting FIEMAP_EXTENT_LAST	2009-05-06 16:36:09 -07:00
ioprio.c
Kconfig	nilfs2: update makefile and Kconfig	2009-04-07 08:31:16 -07:00
Kconfig.binfmt
libfs.c	Convert obvious places to deactivate_locked_super()	2009-05-09 10:49:40 -04:00
locks.c
Makefile	nilfs2: update makefile and Kconfig	2009-04-07 08:31:16 -07:00
mbcache.c
mpage.c	ext4: Properly initialize the buffer_head state	2009-05-13 15:13:42 -04:00
namei.c	switch lookup_mnt()	2009-06-11 21:36:01 -04:00
namespace.c	fs: mnt_want_write speedup	2009-06-11 21:36:02 -04:00
nfsctl.c
no-block.c
open.c	Switch open_exec() and sys_uselib() to do_open_filp()	2009-05-09 10:49:42 -04:00
pipe.c	splice: implement default splice_read method	2009-05-11 14:13:10 +02:00
pnode.c
pnode.h
posix_acl.c
read_write.c	splice: implement default splice_read method	2009-05-11 14:13:10 +02:00
read_write.h
readdir.c
select.c
seq_file.c
signalfd.c
splice.c	splice: fix kmaps in default_file_splice_write()	2009-05-19 11:37:46 +02:00
stack.c
stat.c	kill vfs_stat_fd / vfs_lstat_fd	2009-04-20 23:02:52 -04:00
super.c	NULL noise in fs/super.c:kill_bdev_super()	2009-05-09 10:49:41 -04:00
sync.c
timerfd.c
utimes.c
xattr_acl.c
xattr.c	xattr: use memdup_user()	2009-04-20 23:02:50 -04:00