Lukas Czerner 689110098c ext4: make ext4_block_in_group() much more efficient ... Currently in when getting the block group number for a particular block in ext4_block_in_group() we're using ext4_get_group_no_and_offset() which uses do_div() to get the block group and the remainer which is offset within the group. We don't need all of that in ext4_block_in_group() as we only need to figure out the group number. This commit changes ext4_block_in_group() to calculate group number directly. This shows as a big improvement with regards to cpu utilization. Measuring fallocate -l 15T on fresh file system with perf showed that 23% of cpu time was spend in the ext4_get_group_no_and_offset(). With this change it completely disappears from the list only bumping the occurrence of ext4_init_block_bitmap() which is the biggest user of ext4_block_in_group() by 4%. As the result of this change on my system the fallocate call was approx. 10% faster. However since there is '-g' option in mkfs which allow us setting different groups size (mostly for developers) I've introduced new per file system flag whether we have a standard block group size or not. The flag is used to determine whether we can use the bit shift optimization or not. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>		2013-04-03 22:12:52 -04:00
..
9p	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
adfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
affs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
afs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
autofs4	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
befs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
bfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
btrfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2013-03-29 11:13:25 -07:00
cachefiles	FS-Cache: Mark cancellation of in-progress operation	2012-12-20 22:34:00 +00:00
ceph	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
cifs	Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6	2013-03-21 17:59:22 -07:00
coda	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
configfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
cramfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
debugfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
devpts	fs: Limit sys_mount to only request filesystem modules (Part 2).	2013-03-07 01:08:55 -08:00
dlm	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
ecryptfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2013-03-09 16:51:13 -08:00
efs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
exofs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
exportfs	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
ext2	ext2: Fix BUG_ON in evict() on inode deletion	2013-03-13 15:23:44 +01:00
ext3	ext3: Fix format string issues	2013-03-11 22:05:56 +01:00
ext4	ext4: make ext4_block_in_group() much more efficient	2013-04-03 22:12:52 -04:00
f2fs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
fat	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
freevxfs	fs: Readd the fs module aliases.	2013-03-12 18:55:21 -07:00
fscache	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
fuse	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
gfs2	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
hfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
hfsplus	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
hostfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2013-03-13 15:47:50 -07:00
hpfs	fs: Limit sys_mount to only request filesystem modules. (Part 3)	2013-03-11 07:09:48 -07:00
hppfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
hugetlbfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
isofs	fs: Readd the fs module aliases.	2013-03-12 18:55:21 -07:00
jbd	jbd: don't wake kjournald unnecessarily	2013-01-14 22:50:45 +01:00
jbd2	jbd2: fix race between jbd2_journal_remove_checkpoint and ->j_commit_callback	2013-04-03 22:06:52 -04:00
jffs2	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
jfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
lockd	Merge branch 'for-3.9' of git://linux-nfs.org/~bfields/linux	2013-02-28 18:02:55 -08:00
logfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
minix	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
ncpfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
nfs	NFS client bugfixes for Linux 3.9	2013-03-26 14:23:45 -07:00
nfs_common	nfs_common: Update the translation between nfsv3 acls linux posix acls	2013-02-13 06:15:14 -08:00
nfsd	nfsd: fix bad offset use	2013-03-22 16:55:15 -04:00
nilfs2	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
nls	…
notify	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
ntfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
ocfs2	fs: Limit sys_mount to only request filesystem modules (Part 2).	2013-03-07 01:08:55 -08:00
omfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
openpromfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
proc	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2013-03-28 13:43:46 -07:00
pstore	A few fixes to reduce places where pstore might hang	2013-02-21 09:38:18 -08:00
qnx4	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
qnx6	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
quota	quota: add missing use of dq_data_lock in __dquot_initialize	2013-03-11 22:05:56 +01:00
ramfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-02-26 20:16:07 -08:00
reiserfs	reiserfs: Use kstrdup instead of kmalloc/strcpy	2013-03-11 22:05:57 +01:00
romfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
squashfs	fs: Limit sys_mount to only request filesystem modules. (Part 3)	2013-03-11 07:09:48 -07:00
sysfs	sysfs fixes for 3.9-rc4	2013-03-28 15:52:14 -07:00
sysv	fs: Readd the fs module aliases.	2013-03-12 18:55:21 -07:00
ubifs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
udf	fs: Limit sys_mount to only request filesystem modules. (Part 3)	2013-03-11 07:09:48 -07:00
ufs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
xfs	- Fix for a potential infinite loop which was introduced in 4d559a3bcb	2013-03-19 15:17:40 -07:00
Kconfig	fuse: Move CUSE Kconfig entry from fs/Kconfig into fs/fuse/Kconfig	2013-01-17 13:08:45 +01:00
Kconfig.binfmt	…
Makefile	f2fs: update Kconfig and Makefile	2012-12-11 13:43:42 +09:00
aio.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
anon_inodes.c	get_empty_filp()/alloc_file() leave both ->f_pos and ->f_version zero	2013-02-26 02:46:11 -05:00
attr.c	userns: Allow chown and setgid preservation	2012-11-20 04:17:24 -08:00
bad_inode.c	lseek: the "whence" argument is called "whence"	2012-12-17 17:15:12 -08:00
binfmt_aout.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
binfmt_elf.c	ImgTec Meta architecture changes for v3.9-rc1	2013-03-03 12:06:09 -08:00
binfmt_elf_fdpic.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-02-26 20:16:07 -08:00
binfmt_em86.c	exec: use -ELOOP for max recursion depth	2012-12-17 17:15:23 -08:00
binfmt_flat.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
binfmt_misc.c	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
binfmt_script.c	exec: do not leave bprm->interp on stack	2012-12-20 17:40:19 -08:00
binfmt_som.c	get rid of pt_regs argument of ->load_binary()	2012-11-28 21:53:38 -05:00
bio-integrity.c	…
bio.c	block: add missing block_bio_complete() tracepoint	2013-01-14 15:00:36 +01:00
block_dev.c	Merge branch 'for-3.9/core' of git://git.kernel.dk/linux-block	2013-02-28 12:52:24 -08:00
buffer.c	Merge branch 'for-3.9/core' of git://git.kernel.dk/linux-block	2013-02-28 12:52:24 -08:00
char_dev.c	char_dev: pin parent kobject	2012-10-22 08:50:37 +03:00
compat.c	Fix: compat_rw_copy_check_uvector() misuse in aio, readv, writev, and security keys	2013-03-12 11:05:45 -07:00
compat_binfmt_elf.c	…
compat_ioctl.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
coredump.c	coredump: remove redundant defines for dumpable states	2013-02-27 19:10:11 -08:00
coredump.h	…
dcache.c	Nest rename_lock inside vfsmount_lock	2013-03-26 18:25:57 -04:00
dcookies.c	…
direct-io.c	fs: Fix possible use-after-free with AIO	2013-02-22 23:31:36 -05:00
drop_caches.c	…
eventfd.c	fs, eventfd: add procfs fdinfo helper	2012-12-17 17:15:27 -08:00
eventpoll.c	epoll: prevent missed events on EPOLL_CTL_MOD	2013-01-02 09:16:43 -08:00
exec.c	coredump: remove redundant defines for dumpable states	2013-02-27 19:10:11 -08:00
fcntl.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
fhandle.c	Merge branch 'for-3.8' of git://linux-nfs.org/~bfields/linux	2012-12-20 14:04:11 -08:00
fifo.c	…
file.c	locking: Various static lock initializer fixes	2013-02-19 08:42:45 +01:00
file_table.c	cache the value of file_inode() in struct file	2013-03-01 19:48:30 -05:00
filesystems.c	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
fs-writeback.c	2 writeback fixes	2013-02-28 13:21:44 -08:00
fs_struct.c	constify path_get/path_put and fs_struct.c stuff	2013-03-01 23:51:07 -05:00
generic_acl.c	…
inode.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
internal.h	Don't bother with redoing rw_verify_area() from default_file_splice_from()	2013-03-21 13:11:11 -04:00
ioctl.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
ioprio.c	…
libfs.c	vfs: drop vmtruncate	2012-12-20 18:46:29 -05:00
locks.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
mbcache.c	…
mount.h	proc: Usable inode numbers for the namespace file descriptors.	2012-11-20 04:19:49 -08:00
mpage.c	…
namei.c	vfs: don't BUG_ON() if following a /proc fd pseudo-symlink results in a symlink	2013-03-08 09:03:07 -08:00
namespace.c	userns: Restrict when proc and sysfs can be mounted	2013-03-27 07:50:08 -07:00
no-block.c	…
open.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-03-03 13:23:03 -08:00
pipe.c	vfs: fix pipe counter breakage	2013-03-12 08:29:17 -07:00
pnode.c	vfs: Carefully propogate mounts across user namespaces	2013-03-27 07:50:05 -07:00
pnode.h	vfs: Carefully propogate mounts across user namespaces	2013-03-27 07:50:05 -07:00
posix_acl.c	…
proc_namespace.c	…
read_write.c	vfs/splice: Fix missed checks in new __kernel_write() helper	2013-03-27 09:24:02 -07:00
read_write.h	…
readdir.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
select.c	sched/rt: Move rt specific bits into new header file	2013-02-07 20:51:08 +01:00
seq_file.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-03-03 13:23:03 -08:00
signalfd.c	fs, epoll: add procfs fdinfo helper	2012-12-17 17:15:27 -08:00
splice.c	Don't bother with redoing rw_verify_area() from default_file_splice_from()	2013-03-21 13:11:11 -04:00
stack.c	…
stat.c	switch vfs_getattr() to struct path	2013-02-26 02:46:08 -05:00
statfs.c	vfs: fix user_statfs to retry once on ESTALE errors	2012-12-20 18:50:07 -05:00
super.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
sync.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
timerfd.c	compat: restore timerfd settime and gettime compat syscalls	2013-03-02 09:35:13 -05:00
utimes.c	vfs: allow utimensat() calls to retry once on an ESTALE error	2012-12-20 18:50:08 -05:00
xattr.c	vfs: make lremovexattr retry once on ESTALE error	2012-12-20 18:50:11 -05:00
xattr_acl.c	…