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55eee80c62
linux/fs
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Richard Kennedy 019b4d123a fs: buffer_head: remove kmem_cache constructor to reduce memory usage under slub 
When using slub, having a kmem_cache constructor forces slub to add a free
pointer to the size of the cached object, which can have a significant
impact to the number of small objects that can fit into a slab.

As buffer_head is relatively small and we can have large numbers of them,
removing the constructor is a definite win.

On x86_64 removing the constructor gives me 39 objects/slab, 3 more than
without the patch.  And on x86_32 73 objects/slab, which is 9 more.

As alloc_buffer_head() already initializes each new object there is very
little difference in actual code run.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <jens.axboe@oracle.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-12 15:52:27 -08:00
..
9p fs/9p: Add hardlink support to .u extension 2010-03-05 15:04:42 -06:00
adfs pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
affs pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
afs make sure data is on disk before calling ->write_inode 2010-03-05 13:25:10 -05:00
autofs
autofs4 Use kill_litter_super() in autofs4 ->kill_sb() 2010-03-03 14:07:54 -05:00
befs befs: fix leak 2010-02-07 03:06:21 -05:00
bfs pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
btrfs Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2010-03-08 14:07:53 -08:00
cachefiles CacheFiles: Fix a race in cachefiles_delete_object() vs rename 2010-02-20 10:06:35 -05:00
cifs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-03-04 08:15:33 -08:00
coda
configfs Fix configfs leak 2010-01-14 09:05:42 -05:00
cramfs
debugfs Lose the new_name argument of fsnotify_move() 2010-02-08 14:38:36 -05:00
devpts
dlm Driver core: Constify struct sysfs_ops in struct kobj_type 2010-03-07 17:04:49 -08:00
ecryptfs ecryptfs: use after free 2010-01-19 22:36:06 -06:00
efs
exofs pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
exportfs
ext2 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-03-05 13:20:53 -08:00
ext3 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-03-05 13:20:53 -08:00
ext4 Driver core: Constify struct sysfs_ops in struct kobj_type 2010-03-07 17:04:49 -08:00
fat pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
freevxfs
fscache FS-Cache: Remove the EXPERIMENTAL flag 2010-03-08 07:32:34 -08:00
fuse Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 2010-03-03 08:08:21 -08:00
gfs2 Driver core: Constify struct sysfs_ops in struct kobj_type 2010-03-07 17:04:49 -08:00
hfs pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
hfsplus pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
hostfs
hpfs Don't mess with generic_permission() under ->d_lock in hpfs 2010-03-03 14:07:58 -05:00
hppfs hppfs can use existing proc_mnt, no need for do_kern_mount() in there 2010-03-03 14:08:00 -05:00
hugetlbfs
isofs
jbd jbd: Delay discarding buffers in journal_unmap_buffer 2010-03-05 00:20:26 +01:00
jbd2 jbd2: clean up an assertion in jbd2_journal_commit_transaction() 2010-02-24 12:11:20 -05:00
jffs2
jfs Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-03-05 13:20:53 -08:00
lockd lockd: don't clear sm_monitored on nsm_reboot_lookup 2010-02-08 16:20:35 -05:00
logfs Merge git://git.kernel.org/pub/scm/linux/kernel/git/joern/logfs 2010-03-06 13:18:03 -08:00
minix pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
ncpfs
nfs Merge branch 'for-2.6.34' of git://linux-nfs.org/~bfields/linux 2010-03-06 11:31:38 -08:00
nfs_common
nfsd Merge branch 'for-2.6.34' of git://linux-nfs.org/~bfields/linux 2010-03-06 11:31:38 -08:00
nilfs2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-03-04 08:15:33 -08:00
nls
notify switch inotify_user to anon_inode 2010-02-19 03:35:12 -05:00
ntfs pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
ocfs2 fs/ocfs2/cluster/tcp.c: remove use of NIPQUAD, use %pI4 2010-03-12 15:52:27 -08:00
omfs pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
openpromfs
partitions block: Stop using byte offsets 2010-01-11 14:30:09 +01:00
proc proc: warn on non-existing proc entries 2010-03-06 11:26:45 -08:00
qnx4
quota quota: stop using QUOTA_OK / NO_QUOTA 2010-03-05 00:20:31 +01:00
ramfs nommu: fix shared mmap after truncate shrinkage problems 2010-01-16 12:15:40 -08:00
reiserfs Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-03-05 13:20:53 -08:00
romfs fix leak in romfs_fill_super() 2010-01-26 22:22:26 -05:00
smbfs
squashfs Squashfs: get rid of obsolete definition in header file 2010-03-05 15:35:35 +00:00
sysfs sysfs: Kill unused sysfs_sb variable. 2010-03-07 17:04:52 -08:00
sysv pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
ubifs Revert "lib: build list_sort() only if needed" 2010-03-07 09:54:44 -08:00
udf Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-03-05 13:20:53 -08:00
ufs Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-03-05 13:20:53 -08:00
xfs Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs 2010-03-06 11:32:21 -08:00
aio.c
anon_inodes.c Sanitize f_flags helpers 2009-12-22 12:27:34 -05:00
attr.c fs: use rlimit helpers 2010-03-06 11:26:29 -08:00
bad_inode.c
binfmt_aout.c coredump: move dump_write() and dump_seek() into a header file 2010-03-06 11:26:45 -08:00
binfmt_elf_fdpic.c coredump: pass mm->flags as a coredump parameter for consistency 2010-03-06 11:26:46 -08:00
binfmt_elf.c coredump: pass mm->flags as a coredump parameter for consistency 2010-03-06 11:26:46 -08:00
binfmt_em86.c
binfmt_flat.c fs: use rlimit helpers 2010-03-06 11:26:29 -08:00
binfmt_misc.c
binfmt_script.c
binfmt_som.c Split 'flush_old_exec' into two functions 2010-01-29 08:22:01 -08:00
bio-integrity.c block: fix bugs in bio-integrity mempool usage 2010-01-30 20:28:19 +01:00
bio.c Revert "blkdev: fix merge_bvec_fn return value checks" 2010-03-02 19:17:34 +01:00
block_dev.c freeze_bdev: don't deactivate successfully frozen MS_RDONLY sb 2010-02-07 03:06:21 -05:00
buffer.c fs: buffer_head: remove kmem_cache constructor to reduce memory usage under slub 2010-03-12 15:52:27 -08:00
char_dev.c
compat_binfmt_elf.c elf coredump: replace ELF_CORE_EXTRA_* macros by functions 2010-03-06 11:26:45 -08:00
compat_ioctl.c fs/compat_ioctl.c: suppress two warnings 2010-03-06 11:26:35 -08:00
compat.c
dcache.c fix race in d_splice_alias() 2010-03-03 14:13:08 -05:00
dcookies.c
direct-io.c
drop_caches.c
eventfd.c eventfd - allow atomic read and waitqueue remove 2010-01-25 12:26:38 -02:00
eventpoll.c anonfd: Allow making anon files read-only 2009-12-22 12:27:34 -05:00
exec.c coredump: suppress uid comparison test if core output files are pipes 2010-03-06 11:26:46 -08:00
fcntl.c fs: use rlimit helpers 2010-03-06 11:26:29 -08:00
fifo.c
file_table.c vfs: take f_lock on modifying f_mode after open time 2010-03-06 11:26:25 -08:00
file.c fs: use rlimit helpers 2010-03-06 11:26:29 -08:00
filesystems.c
fs_struct.c
fs-writeback.c pass writeback_control to ->write_inode 2010-03-05 13:25:52 -05:00
generic_acl.c
inode.c dquot: move dquot initialization responsibility into the filesystem 2010-03-05 00:20:30 +01:00
internal.h Take vfsmount_lock to fs/internal.h 2010-03-03 14:07:59 -05:00
ioctl.c
ioprio.c
Kconfig
Kconfig.binfmt
libfs.c libfs: Unexport and kill simple_prepare_write 2010-03-03 13:00:17 -05:00
locks.c Switch may_open() and break_lease() to passing O_... 2010-03-03 13:00:21 -05:00
Makefile
mbcache.c
mpage.c
namei.c Fix a dumb typo - use of & instead of && 2010-03-06 10:54:48 -08:00
namespace.c vfs: add NOFOLLOW flag to umount(2) 2010-03-03 14:08:00 -05:00
nfsctl.c Switch may_open() and break_lease() to passing O_... 2010-03-03 13:00:21 -05:00
no-block.c
open.c Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-03-05 13:20:53 -08:00
pipe.c
pnode.c Kill CL_PROPAGATION, sanitize fs/pnode.c:get_source() 2010-03-03 13:00:22 -05:00
pnode.h VFS: Clean up shared mount flag propagation 2010-03-03 14:07:55 -05:00
posix_acl.c
read_write.c
read_write.h
readdir.c
select.c fs: use rlimit helpers 2010-03-06 11:26:29 -08:00
seq_file.c seq_file: fix new kernel-doc warnings 2010-03-07 15:48:26 -08:00
signalfd.c anonfd: Allow making anon files read-only 2009-12-22 12:27:34 -05:00
splice.c
stack.c
stat.c Add unlocked version of inode_add_bytes() function 2009-12-23 13:33:54 +01:00
super.c Mirror MS_KERNMOUNT in ->mnt_flags 2010-03-03 14:08:00 -05:00
sync.c quota: move code from sync_quota_sb into vfs_quota_sync 2010-03-05 00:20:24 +01:00
timerfd.c anonfd: Allow making anon files read-only 2009-12-22 12:27:34 -05:00
utimes.c
xattr_acl.c
xattr.c