William Cohen 97dc32cdb1 reduce size of task_struct on 64-bit machines ... This past week I was playing around with that pahole tool (http://oops.ghostprotocols.net:81/acme/dwarves/) and looking at the size of various struct in the kernel. I was surprised by the size of the task_struct on x86_64, approaching 4K. I looked through the fields in task_struct and found that a number of them were declared as "unsigned long" rather than "unsigned int" despite them appearing okay as 32-bit sized fields. On x86_64 "unsigned long" ends up being 8 bytes in size and forces 8 byte alignment. Is there a reason there a reason they are "unsigned long"? The patch below drops the size of the struct from 3808 bytes (60 64-byte cachelines) to 3760 bytes (59 64-byte cachelines). A couple other fields in the task struct take a signficant amount of space: struct thread_struct thread; 688 struct held_lock held_locks[30]; 1680 CONFIG_LOCKDEP is turned on in the .config [akpm@linux-foundation.org: fix printk warnings] Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2007-05-08 11:14:58 -07:00
..
9p	v9fs: don't use primary fid when removing file	2007-04-24 08:23:08 -07:00
adfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
affs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
afs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
autofs
autofs4	[PATCH] autofs4: fix race in unhashed dentry code	2007-04-12 15:31:42 -07:00
befs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
bfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
cifs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
coda	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
configfs	remove "struct subsystem" as it is no longer needed	2007-05-02 18:57:59 -07:00
cramfs	mm: make read_cache_page synchronous	2007-05-07 12:12:51 -07:00
debugfs	remove "struct subsystem" as it is no longer needed	2007-05-02 18:57:59 -07:00
devpts
dlm	Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw	2007-05-07 12:26:27 -07:00
ecryptfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
efs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
exportfs
ext2	ext2/3/4: fix file date underflow on ext2 3 filesystems on 64 bit systems	2007-05-08 11:14:58 -07:00
ext3	ext2/3/4: fix file date underflow on ext2 3 filesystems on 64 bit systems	2007-05-08 11:14:58 -07:00
ext4	ext2/3/4: fix file date underflow on ext2 3 filesystems on 64 bit systems	2007-05-08 11:14:58 -07:00
fat	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
freevxfs	mm: make read_cache_page synchronous	2007-05-07 12:12:51 -07:00
fuse	Merge branch 'server-cluster-locking-api' of git://linux-nfs.org/~bfields/linux	2007-05-07 12:34:24 -07:00
gfs2	Factor outstanding I/O error handling	2007-05-08 11:14:57 -07:00
hfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
hfsplus	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
hostfs	uml: hostfs style fixes	2007-05-08 11:14:57 -07:00
hpfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
hppfs
hugetlbfs	hugetlbfs: add NULL check in hugetlb_zero_setup()	2007-05-07 12:12:57 -07:00
isofs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
jbd
jbd2
jffs2	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
jfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
lockd	Merge branch 'server-cluster-locking-api' of git://linux-nfs.org/~bfields/linux	2007-05-07 12:34:24 -07:00
minix	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
msdos
ncpfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
nfs	Merge branch 'server-cluster-locking-api' of git://linux-nfs.org/~bfields/linux	2007-05-07 12:34:24 -07:00
nfs_common
nfsd	Merge branch 'server-cluster-locking-api' of git://linux-nfs.org/~bfields/linux	2007-05-07 12:34:24 -07:00
nls
ntfs	mm: move common segment checks to separate helper function	2007-05-08 11:14:57 -07:00
ocfs2	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
openpromfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
partitions	mm: optimize acorn partition truncate	2007-05-07 12:12:55 -07:00
proc	reduce size of task_struct on 64-bit machines	2007-05-08 11:14:58 -07:00
qnx4	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
ramfs
reiserfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
romfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
smbfs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
sysfs	remove "struct subsystem" as it is no longer needed	2007-05-02 18:57:59 -07:00
sysv	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
udf	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
ufs	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
vfat
xfs	mm: move common segment checks to separate helper function	2007-05-08 11:14:57 -07:00
aio.c	KMEM_CACHE(): simplify slab cache creation	2007-05-07 12:12:55 -07:00
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf.c	[PATCH] fix page leak during core dump	2007-04-02 10:06:08 -07:00
binfmt_elf_fdpic.c	[PATCH] fix page leak during core dump	2007-04-02 10:06:08 -07:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio.c	KMEM_CACHE(): simplify slab cache creation	2007-05-07 12:12:55 -07:00
block_dev.c	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
buffer.c	block_write_full_page(): report ENOSPC	2007-05-08 11:14:57 -07:00
char_dev.c	[PATCH] remove protection of LANANA-reserved majors	2007-04-04 21:12:47 -07:00
compat.c	[PATCH] x86-64: Print type and size correctly for unknown compat ioctls	2007-05-02 19:27:21 +02:00
compat_ioctl.c	[PATCH] x86-64: Shut up warnings for vfat compat ioctls on other file systems	2007-05-02 19:27:21 +02:00
dcache.c	KMEM_CACHE(): simplify slab cache creation	2007-05-07 12:12:55 -07:00
dcookies.c
direct-io.c
dnotify.c
dquot.c	mm: remove destroy_dirty_buffers from invalidate_bdev()	2007-05-07 12:12:55 -07:00
drop_caches.c
eventpoll.c
exec.c	exec.c: fix coredump to pipe problem and obscure "security hole"	2007-04-17 16:36:26 -07:00
fcntl.c
fifo.c
file.c
file_table.c
filesystems.c
fs-writeback.c
generic_acl.c
inode.c	slab allocators: Remove SLAB_DEBUG_INITIAL flag	2007-05-07 12:12:57 -07:00
inotify.c
inotify_user.c
internal.h
ioctl.c
ioprio.c
Kconfig	Merge git://git.linux-nfs.org/pub/linux/nfs-2.6	2007-05-04 19:55:11 -07:00
Kconfig.binfmt	blackfin architecture	2007-05-07 12:12:58 -07:00
libfs.c
locks.c	Merge branch 'server-cluster-locking-api' of git://linux-nfs.org/~bfields/linux	2007-05-07 12:34:24 -07:00
Makefile
mbcache.c
mpage.c	Factor outstanding I/O error handling	2007-05-08 11:14:57 -07:00
namei.c	mm: make read_cache_page synchronous	2007-05-07 12:12:51 -07:00
namespace.c
nfsctl.c
no-block.c
open.c
pipe.c
pnode.c
pnode.h
posix_acl.c
quota.c
quota_v1.c
quota_v2.c
read_write.c
read_write.h
readdir.c
select.c
seq_file.c
splice.c	[PATCH] splice: partial write fix	2007-03-29 14:26:42 +02:00
stack.c
stat.c
super.c	the overdue removal of the mount/umount uevents	2007-04-27 10:57:31 -07:00
sync.c	[PATCH] Turn do_sync_file_range() into do_sync_mapping_range()	2007-04-26 15:02:26 -07:00
utimes.c
xattr.c
xattr_acl.c