Linus Torvalds b0e37d7ac6 Merge branch 'dcache-word-accesses' ... * branch 'dcache-word-accesses': vfs: use 'unsigned long' accesses for dcache name comparison and hashing This does the name hashing and lookup using word-sized accesses when that is efficient, namely on x86 (although any little-endian machine with good unaligned accesses would do). It does very much depend on little-endian logic, but it's a very hot couple of functions under some real loads, and this patch improves the performance of __d_lookup_rcu() and link_path_walk() by up to about 30%. Giving a 10% improvement on some very pathname-heavy benchmarks. Because we do make unaligned accesses past the filename, the optimization is disabled when CONFIG_DEBUG_PAGEALLOC is active, and we effectively depend on the fact that on x86 we don't really ever have the last page of usable RAM followed immediately by any IO memory (due to ACPI tables, BIOS buffer areas etc). Some of the bit operations we do are a bit "subtle". It's commented, but you do need to really think about the code. Or just consider it black magic. Thanks to people on G+ for some of the optimized bit tricks.		2012-03-19 16:37:28 -07:00
..
9p	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs	2012-01-10 15:09:01 -08:00
adfs	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
affs	affs: propagate umode_t	2012-01-03 22:55:04 -05:00
afs	afs: Remote abort can cause BUG in rxrpc code	2012-03-16 17:01:41 -07:00
autofs4	autofs: work around unhappy compat problem on x86-64	2012-02-25 12:10:27 -08:00
befs	vfs: fix the stupidity with i_dentry in inode destructors	2012-01-03 22:52:40 -05:00
bfs	switch ->create() to umode_t	2012-01-03 22:54:53 -05:00
btrfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2012-03-09 18:09:18 -08:00
cachefiles	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
ceph	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2012-02-02 15:47:33 -08:00
cifs	CIFS: Do not kmalloc under the flocks spinlock	2012-03-06 21:50:15 -06:00
coda	coda: switch coda_cnode_make() to sane API as well, clean coda_lookup()	2012-01-10 11:13:16 -05:00
configfs	configfs: convert to umode_t	2012-01-03 22:54:57 -05:00
cramfs	Merge branches 'vfsmount-guts', 'umode_t' and 'partitions' into Z	2012-01-06 23:15:54 -05:00
debugfs	kernel-doc: fix new warnings in debugfs	2012-01-24 10:47:41 -08:00
devpts	devpts: fix double-free on mount failure	2012-01-08 20:19:03 -05:00
dlm	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm	2012-01-10 14:55:55 -08:00
ecryptfs	ecryptfs: fix printk format warning for size_t	2012-02-28 16:55:30 -08:00
efs	vfs: fix the stupidity with i_dentry in inode destructors	2012-01-03 22:52:40 -05:00
exofs	Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd	2012-01-09 12:51:01 -08:00
exportfs
ext2	ext2: protect inode changes in the SETVERSION and SETFLAGS ioctls	2012-01-11 13:39:02 +01:00
ext3	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs	2012-01-09 12:51:21 -08:00
ext4	Merge branch 'for_linus' into for_linus_merged	2012-01-10 11:54:07 -05:00
fat	Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb	2012-01-09 12:09:47 -08:00
freevxfs	fs: propagate umode_t, misc bits	2012-01-03 22:55:10 -05:00
fscache
fuse	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse	2012-01-12 12:39:21 -08:00
gfs2	GFS2: Read resource groups on mount	2012-02-28 09:52:39 +00:00
hfs	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
hfsplus	hfsplus: creation of hidden dir on mount can fail	2012-01-10 17:48:52 -05:00
hostfs	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
hpfs	switch ->mknod() to umode_t	2012-01-03 22:54:54 -05:00
hppfs	vfs: for usbfs, etc. internal vfsmounts ->mnt_sb->s_root == ->mnt_root	2012-01-03 22:52:41 -05:00
hugetlbfs	mm: compaction: introduce sync-light migration for use by compaction	2012-01-12 20:13:09 -08:00
isofs	isofs: inode leak on mount failure	2012-01-09 10:48:11 -05:00
jbd	jbd: Issue cache flush after checkpointing	2012-01-11 13:36:57 +01:00
jbd2	Merge branch 'for_linus' into for_linus_merged	2012-01-10 11:54:07 -05:00
jffs2	jffs2: do not initialize variable unnecessarily	2012-01-11 09:53:51 +00:00
jfs	Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm	2012-01-08 13:10:57 -08:00
lockd	module_param: make bool parameters really bool (drivers & misc)	2012-01-13 09:32:20 +10:30
logfs	mtd: fix merge conflict resolution breakage	2012-02-01 11:10:24 -08:00
minix	Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-01-08 12:19:57 -08:00
ncpfs	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
nfs	NFSv4: fix server_scope memory leak	2012-02-17 17:34:03 -05:00
nfs_common
nfsd	Merge branch 'for-3.3' of git://linux-nfs.org/~bfields/linux	2012-01-14 12:26:41 -08:00
nilfs2	nilfs2: fix NULL pointer dereference in nilfs_load_super_block()	2012-03-16 17:14:44 -07:00
nls	NLS: raname "maxlen" to "maxout" in UTF conversion routines	2011-11-26 19:58:47 -08:00
notify	fsnotify: don't BUG in fsnotify_destroy_mark()	2012-01-14 18:01:42 -08:00
ntfs	NTFS: Correct two spelling errors "dealocate" to "deallocate" in mft.c.	2012-02-24 09:17:09 +00:00
ocfs2	ocfs2: deal with wraparounds of i_nlink in ocfs2_rename()	2012-02-13 20:45:39 -05:00
omfs	omfs: propagate umode_t	2012-01-03 22:55:01 -05:00
openpromfs	vfs: fix the stupidity with i_dentry in inode destructors	2012-01-03 22:52:40 -05:00
proc	Fix race in process_vm_rw_core	2012-02-02 12:55:17 -08:00
pstore	pstore: gracefully handle NULL pstore_info functions	2011-11-18 13:49:00 -08:00
qnx4	qnx4: don't leak ->BitMap on late failure exits	2012-01-19 13:54:36 -05:00
quota	quota: Fix deadlock with suspend and quotas	2012-02-13 20:45:39 -05:00
ramfs	pohmelfs: propagate umode_t	2012-01-03 22:55:07 -05:00
reiserfs	reiserfs: don't lock root inode searching	2012-01-10 16:30:54 -08:00
romfs	MTD pull for 3.3	2012-01-10 13:45:22 -08:00
squashfs	Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-next	2012-01-13 10:34:57 -08:00
sysfs	sysfs: Complain bitterly about attempts to remove files from nonexistent directories.	2012-01-24 12:12:32 -08:00
sysv	vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb	2012-01-06 23:16:53 -05:00
ubifs	UBIFS: fix non-debug configuration build	2012-01-15 13:46:02 +02:00
udf	udf: Fix deadlock in udf_release_file()	2012-03-10 16:05:38 -05:00
ufs	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
xfs	xfs: make inode quota check more general	2012-02-21 10:12:43 -06:00
aio.c	aio: fix the "too late munmap()" race	2012-03-09 18:59:59 -08:00
anon_inodes.c
attr.c	switch is_sxid() to umode_t	2012-01-03 22:55:11 -05:00
bad_inode.c	switch ->mknod() to umode_t	2012-01-03 22:54:54 -05:00
binfmt_aout.c	aout: move setup_arg_pages() prior to reading/mapping the binary	2012-03-05 13:51:32 -08:00
binfmt_elf_fdpic.c
binfmt_elf.c	regset: Prevent null pointer reference on readonly regsets	2012-03-02 11:38:15 -08:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c	vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb	2012-01-06 23:16:53 -05:00
binfmt_script.c
binfmt_som.c
bio-integrity.c	fs: add export.h to files using EXPORT_SYMBOL/THIS_MODULE macros	2011-10-31 19:30:31 -04:00
bio.c	bio: don't overflow in bio_get_nr_vecs()	2012-02-08 22:07:18 +01:00
block_dev.c	block: Fix NULL pointer dereference in sd_revalidate_disk	2012-03-02 10:38:33 +01:00
buffer.c	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
char_dev.c	char_dev.c: fix up some whitespace errors	2011-12-13 11:18:17 -08:00
compat_binfmt_elf.c
compat_ioctl.c	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-01-15 12:49:56 -08:00
compat.c	vfs: fix compat_sys_stat() handling of overflows in st_nlink	2012-02-13 20:45:39 -05:00
dcache.c	Merge branch 'dcache-word-accesses'	2012-03-19 16:37:28 -07:00
dcookies.c
direct-io.c	Restore direct_io / truncate locking API	2012-02-23 15:56:21 -08:00
drop_caches.c
eventfd.c
eventpoll.c	Don't limit non-nested epoll paths	2012-03-18 12:25:04 -07:00
exec.c	coredump_wait: don't call complete_vfork_done()	2012-03-05 15:49:42 -08:00
fcntl.c
fhandle.c	vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb	2012-01-06 23:16:53 -05:00
fifo.c
file_table.c	vfs: prevent remount read-only if pending removes	2012-01-06 23:20:13 -05:00
file.c
filesystems.c	vfs: convert fs_supers to hlist	2012-01-03 22:52:39 -05:00
fs_struct.c
fs-writeback.c	writeback: fix NULL bdi->dev in trace writeback_single_inode	2012-02-01 16:53:40 +08:00
generic_acl.c
inode.c	restore smp_mb() in unlock_new_inode()	2012-03-10 17:07:28 -05:00
internal.h	vfs: protect remounting superblock read-only	2012-01-06 23:20:12 -05:00
ioctl.c	vfs: fix up ENOIOCTLCMD error handling	2012-01-05 15:40:12 -08:00
ioprio.c	block: strip out locking optimization in put_io_context()	2012-02-07 07:51:30 +01:00
Kconfig	vfs: use 'unsigned long' accesses for dcache name comparison and hashing	2012-03-08 18:08:44 -08:00
Kconfig.binfmt	fs: binfmt_elf: create Kconfig variable for PIE randomization	2012-01-10 16:30:51 -08:00
libfs.c	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
locks.c	vfs: fix handling of lock allocation failure in lease-break case	2011-12-26 10:25:26 -08:00
Makefile	Merge branches 'vfsmount-guts', 'umode_t' and 'partitions' into Z	2012-01-06 23:15:54 -05:00
mbcache.c
mount.h	vfs: keep list of mounts for each superblock	2012-01-06 23:20:12 -05:00
mpage.c	fs: remove unneeded plug in mpage_readpages()	2012-01-12 09:19:54 +01:00
namei.c	Merge branch 'dcache-word-accesses'	2012-03-19 16:37:28 -07:00
namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-01-08 13:21:22 -08:00
no-block.c
open.c	switch security_path_chmod() to struct path *	2012-01-06 23:16:53 -05:00
pipe.c	pipe: fail cleanly when root tries F_SETPIPE_SZ with big size	2012-01-12 20:13:04 -08:00
pnode.c	vfs: switch pnode.h macros to struct mount *	2012-01-03 22:57:11 -05:00
pnode.h	vfs: switch pnode.h macros to struct mount *	2012-01-03 22:57:11 -05:00
posix_acl.c	vfs: pass all mask flags check_acl and posix_acl_permission	2011-10-28 14:58:54 +02:00
proc_namespace.c	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
read_write.c	Cross Memory Attach	2011-10-31 17:30:44 -07:00
read_write.h
readdir.c
select.c	sys_poll: fix incorrect type for 'timeout' parameter	2012-02-21 17:24:20 -08:00
seq_file.c	constify seq_file stuff	2012-01-03 22:52:40 -05:00
signalfd.c	epoll: ep_unregister_pollwait() can use the freed pwq->whead	2012-02-24 11:42:50 -08:00
splice.c	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
stack.c	filesystems: add set_nlink()	2011-11-02 12:53:43 +01:00
stat.c	readlinkat: ensure we return ENOENT for the empty pathname for normal lookups	2011-11-02 12:53:42 +01:00
statfs.c	vfs: new helper - vfs_ustat()	2012-01-03 22:53:07 -05:00
super.c	vfs: Provide function to get superblock and wait for it to thaw	2012-02-13 20:45:38 -05:00
sync.c	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
timerfd.c
utimes.c
xattr_acl.c
xattr.c	vfs: mnt_drop_write_file()	2012-01-03 22:52:40 -05:00