npiggin@suse.de 96029c4e09 fs: introduce mnt_clone_write ...

This patch speeds up lmbench lat_mmap test by about another 2% after the
first patch.

Before:
 avg = 462.286
 std = 5.46106

After:
 avg = 453.12
 std = 9.58257

(50 runs of each, stddev gives a reasonable confidence)

It does this by introducing mnt_clone_write, which avoids some heavyweight
operations of mnt_want_write if called on a vfsmount which we know already
has a write count; and mnt_want_write_file, which can call mnt_clone_write
if the file is open for write.

After these two patches, mnt_want_write and mnt_drop_write go from 7% on
the profile down to 1.3% (including mnt_clone_write).

[AV: mnt_want_write_file() should take file alone and derive mnt from it;
not only all callers have that form, but that's the only mnt about which
we know that it's already held for write if file is opened for write]

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

fs/adfs: return f_fsid for statfs(2)

2009-04-02 19:05:08 -07:00

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

fs/Kconfig: move bfs out

2009-01-22 13:15:57 +03:00

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

fs/cramfs: return f_fsid for statfs(2)

2009-04-02 19:05:08 -07:00

debugfs

debugfs: function to know if debugfs is initialized

2009-03-23 16:25:46 +01:00

devpts

devpts: unregister the file system on error

2009-06-11 08:51:06 -07:00

dlm

dlm: fix length calculation in compat code

2009-03-11 12:23:59 -05:00

ecryptfs

Convert obvious places to deactivate_locked_super()

2009-05-09 10:49:40 -04:00

efs

fs/efs: return f_fsid for statfs(2)

2009-04-02 19:05:09 -07:00

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

fs/Kconfig: move vxfs out

2009-01-22 13:15:58 +03:00

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

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6

2009-04-02 21:09:10 -07:00

hostfs

constify dentry_operations: misc filesystems

2009-03-27 14:44:00 -04:00

hpfs

Fix races around the access to ->s_options

2009-05-09 10:51:34 -04:00

hppfs

hppfs: hppfs_read_file() may return -ERROR

2009-04-02 19:04:53 -07:00

hugetlbfs

Merge branch 'master' into next

2009-05-22 18:40:59 +10:00

isofs

fs/isofs: return f_fsid for statfs(2)

2009-04-02 19:05:09 -07:00

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

fs/minix: return f_fsid for statfs(2)

2009-04-02 19:05:09 -07:00

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

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6

2009-04-02 21:09:10 -07:00

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

fs/qnx4: return f_fsid for statfs(2)

2009-04-02 19:05:10 -07:00

quota

quota: remove obsolete comments in fs/quota/Makefile

2009-04-27 16:49:52 +02:00

ramfs

ramfs: fix double freeing s_fs_info on failed mount

2009-04-07 07:39:59 -07:00

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

constify dentry_operations: misc filesystems

2009-03-27 14:44:00 -04:00

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

fs/sysv: return f_fsid for statfs(2)

2009-04-02 19:05:10 -07:00

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

aio: lookup_ioctx can return the wrong value when looking up a bogus context

2009-03-19 15:57:18 -07:00

anon_inodes.c

constify dentry_operations: rest

2009-03-27 14:44:03 -04:00

attr.c

vfs: Use lowercase names of quota functions

2009-03-26 02:18:35 +01:00

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

Trim includes in binfmt_elf

2009-03-31 23:00:27 -04:00

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

Don't crap into descriptor table in binfmt_som

2009-03-31 23:00:28 -04:00

bio-integrity.c

block: add private bio_set for bio integrity allocations

2009-03-24 12:35:17 +01:00

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

vfs: skip I_CLEAR state inodes

2009-04-02 19:04:48 -07:00

eventfd.c

epoll keyed wakeups: make eventfd use keyed wakeups

2009-04-01 08:59:20 -07:00

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

fs: introduce mnt_clone_write

2009-06-11 21:36:02 -04:00

file.c

…

filesystems.c

fs: Mark get_filesystem_list() as __init function.

2009-04-20 23:02:52 -04:00

fs_struct.c

Get rid of indirect include of fs_struct.h

2009-03-31 23:00:27 -04:00

fs-writeback.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2009-04-03 15:24:35 -07:00

generic_acl.c

New helper - current_umask()

2009-03-31 23:00:26 -04:00

inode.c

fs: introduce mnt_clone_write

2009-06-11 21:36:02 -04:00

internal.h

New locking/refcounting for fs_struct

2009-03-31 23:00:26 -04:00

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: introduce mnt_clone_write

2009-06-11 21:36:02 -04:00

nfsctl.c

…

no-block.c

…

open.c

fs: introduce mnt_clone_write

2009-06-11 21:36:02 -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

cpumask: fix seq_bitmap_*() functions.

2009-03-30 22:05:11 +10:30

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

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-quota-2.6

2009-03-27 14:48:34 -07:00

timerfd.c

timerfd: add flags check

2009-02-18 15:37:53 -08:00

utimes.c

…

xattr_acl.c

…

xattr.c

fs: introduce mnt_clone_write

2009-06-11 21:36:02 -04:00