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Matt Mackall 10cef60295 [PATCH] slob: introduce the SLOB allocator 
configurable replacement for slab allocator

This adds a CONFIG_SLAB option under CONFIG_EMBEDDED.  When CONFIG_SLAB is
disabled, the kernel falls back to using the 'SLOB' allocator.

SLOB is a traditional K&R/UNIX allocator with a SLAB emulation layer,
similar to the original Linux kmalloc allocator that SLAB replaced.  It's
signicantly smaller code and is more memory efficient.  But like all
similar allocators, it scales poorly and suffers from fragmentation more
than SLAB, so it's only appropriate for small systems.

It's been tested extensively in the Linux-tiny tree.  I've also
stress-tested it with make -j 8 compiles on a 3G SMP+PREEMPT box (not
recommended).

Here's a comparison for otherwise identical builds, showing SLOB saving
nearly half a megabyte of RAM:

$ size vmlinux*
   text    data     bss     dec     hex filename
3336372  529360  190812 4056544  3de5e0 vmlinux-slab
3323208  527948  190684 4041840  3dac70 vmlinux-slob

$ size mm/{slab,slob}.o
   text    data     bss     dec     hex filename
  13221     752      48   14021    36c5 mm/slab.o
   1896      52       8    1956     7a4 mm/slob.o

/proc/meminfo:
                  SLAB          SLOB      delta
MemTotal:        27964 kB      27980 kB     +16 kB
MemFree:         24596 kB      25092 kB    +496 kB
Buffers:            36 kB         36 kB       0 kB
Cached:           1188 kB       1188 kB       0 kB
SwapCached:          0 kB          0 kB       0 kB
Active:            608 kB        600 kB      -8 kB
Inactive:          808 kB        812 kB      +4 kB
HighTotal:           0 kB          0 kB       0 kB
HighFree:            0 kB          0 kB       0 kB
LowTotal:        27964 kB      27980 kB     +16 kB
LowFree:         24596 kB      25092 kB    +496 kB
SwapTotal:           0 kB          0 kB       0 kB
SwapFree:            0 kB          0 kB       0 kB
Dirty:               4 kB         12 kB      +8 kB
Writeback:           0 kB          0 kB       0 kB
Mapped:            560 kB        556 kB      -4 kB
Slab:             1756 kB          0 kB   -1756 kB
CommitLimit:     13980 kB      13988 kB      +8 kB
Committed_AS:     4208 kB       4208 kB       0 kB
PageTables:         28 kB         28 kB       0 kB
VmallocTotal:  1007312 kB    1007312 kB       0 kB
VmallocUsed:        48 kB         48 kB       0 kB
VmallocChunk:  1007264 kB    1007264 kB       0 kB

(this work has been sponsored in part by CELF)

From: Ingo Molnar <mingo@elte.hu>

   Fix 32-bitness bugs in mm/slob.c.

Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
 		2006-01-08 20:13:41 -08:00
..
9p [INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h 2006-01-03 13:11:21 -08:00
adfs [PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason 2005-11-09 07:55:57 -08:00
affs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
afs fs/afs/callback.c should #include "cmservice.h" 2005-11-08 16:56:17 +01:00
autofs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
autofs4 [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
befs remove unused fs/befs/attribute.c 2005-11-08 16:54:53 +01:00
bfs [PATCH] bfs iget() abuses 2005-10-04 13:22:01 -07:00
cifs [CIFS] For previous fix, mode on mkdir needed S_IFDIR left out. 2005-11-29 22:38:43 -08:00
coda [PATCH] Driver Core: fix up all callers of class_device_create() 2005-10-28 09:52:52 -07:00
configfs [PATCH] configfs: User-driven configuration filesystem 2006-01-03 11:45:28 -08:00
cramfs [PATCH] fs/cramfs/uncompress.c should #include <linux/cramfs_fs.h> 2005-09-10 10:06:35 -07:00
debugfs
…
devfs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
devpts [PATCH] Generic VFS fallback for security xattrs 2005-09-05 00:05:52 -07:00
efs
…
exportfs
…
ext2 [PATCH] ext2: remove duplicate newlines in ext2_fill_super 2005-11-13 18:14:17 -08:00
ext3 [PATCH] ext3: Wrong return value for EXT3_IOC_GROUP_ADD 2005-11-28 14:42:24 -08:00
fat [PATCH] fat: respect silent mount flag 2005-11-09 07:55:58 -08:00
freevxfs fs/freevxfs/: add #include's 2005-11-08 16:47:45 +01:00
fuse [PATCH] fuse: check file type in lookup 2006-01-06 08:33:56 -08:00
hfs [PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason 2005-11-09 07:55:57 -08:00
hfsplus [PATCH] hfsplus oops fix 2006-01-06 08:33:20 -08:00
hostfs [PATCH] uml: hostfs - fix possible PAGE_CACHE_SHIFT overflows 2005-12-29 09:48:15 -08:00
hpfs [PATCH] hpfs: remove spurious mtime update 2005-11-09 07:55:57 -08:00
hppfs [PATCH] hppfs: fix symlink error path 2005-08-26 11:39:19 -07:00
hugetlbfs [PATCH] Hugetlb: Copy on Write support 2006-01-06 08:33:23 -08:00
isofs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
jbd [PATCH] jbd: split checkpoint lists 2006-01-06 08:33:59 -08:00
jffs jffs_fm.c should #include "intrep.h" 2005-11-08 16:48:36 +01:00
jffs2 [JFFS2] Fix the slab cache constructor of 'struct jffs2_inode_info' objects. 2005-11-29 16:57:17 +01:00
jfs JFS: set i_ctime & i_mtime on target directory when creating links 2005-10-31 16:53:04 -06:00
lockd SUNRPC: get rid of cl_chatty 2006-01-06 14:58:56 -05:00
minix [PATCH] update filesystems for new delete_inode behavior 2005-09-09 13:57:27 -07:00
msdos [PATCH] fat: remove the unneeded vfat_find() in vfat_rename() 2005-10-30 17:37:32 -08:00
ncpfs [PATCH] add a file_permission helper 2005-11-09 07:55:59 -08:00
nfs NFSv4: Fix an Oops in nfs_do_expire_all_delegations 2006-01-06 14:58:58 -05:00
nfs_common [PATCH] nfsacl: Solaris VxFS compatibility fix 2005-10-11 09:46:54 -07:00
nfsd SUNRPC: get rid of cl_chatty 2006-01-06 14:58:56 -05:00
nls
…
ntfs update the email address of Randy Dunlap 2006-01-03 13:37:51 +01:00
ocfs2 [PATCH] This patch contains the following cleanups: 2006-01-03 11:45:55 -08:00
openpromfs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
partitions [PATCH] s390: cleanup Kconfig 2006-01-06 08:33:53 -08:00
proc [PATCH] slob: introduce the SLOB allocator 2006-01-08 20:13:41 -08:00
qnx4 fs/qnx4/bitmap.c: #if 0 qnx4_new_block() 2006-01-03 13:21:37 +01:00
ramfs [PATCH] NOMMU: Provide shared-writable mmap support on ramfs 2006-01-06 08:33:32 -08:00
reiserfs s/retreiv/retriev/g 2006-01-03 13:27:11 +01:00
relayfs [PATCH] relayfs: remove warning printk() in relay_switch_subbuf() 2005-12-20 17:33:22 -08:00
romfs
…
smbfs [PATCH] smbfs: 'names_cache' memory leak 2005-11-07 07:53:39 -08:00
sysfs [PATCH] sysfs: handle failures in sysfs_make_dirent 2006-01-04 16:18:09 -08:00
sysv [PATCH] update filesystems for new delete_inode behavior 2005-09-09 13:57:27 -07:00
udf remove pointers to the defunct UDF mailing list 2006-01-03 13:19:13 +01:00
ufs [PATCH] fs/ufs: debug mode compilation failure 2006-01-06 15:22:28 -08:00
vfat [PATCH] fat: remove the unneeded vfat_find() in vfat_rename() 2005-10-30 17:37:32 -08:00
xfs [PATCH] xfs: missing gfp_t annotations 2005-12-15 10:04:29 -08:00
Kconfig [PATCH] o Update Kconfig documentation to reflect support for readonly mounts. 2006-01-03 11:45:57 -08:00
Kconfig.binfmt [PATCH] frv: suppress configuration of certain features for FRV 2006-01-08 20:13:36 -08:00
Makefile [PATCH] drop-pagecache 2006-01-08 20:12:40 -08:00
aio.c [PATCH] aio: replace locking comments with assert_spin_locked() 2005-11-13 18:14:16 -08:00
attr.c [PATCH] fs/attr.c: remove BUG() 2005-10-30 17:37:27 -08:00
bad_inode.c
…
binfmt_aout.c [PATCH] mm: mm_init set_mm_counters 2005-10-29 21:40:38 -07:00
binfmt_elf.c [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
binfmt_elf_fdpic.c [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
binfmt_em86.c
…
binfmt_flat.c [PATCH] mm: mm_init set_mm_counters 2005-10-29 21:40:38 -07:00
binfmt_misc.c [PATCH] add a file_permission helper 2005-11-09 07:55:59 -08:00
binfmt_script.c
…
binfmt_som.c [PATCH] mm: mm_init set_mm_counters 2005-10-29 21:40:38 -07:00
bio.c [BLOCK] bio: check for same page merge possibilities in __bio_add_page() 2006-01-06 09:43:28 +01:00
block_dev.c
…
buffer.c [PATCH] __find_get_block_slow() cleanup 2005-11-07 07:53:39 -08:00
char_dev.c [PATCH] cdev: cdev_put oops 2005-07-12 16:01:02 -07:00
compat.c Relax the rw_verify_area() error checking. 2006-01-04 16:20:40 -08:00
compat_ioctl.c [COMPAT] net: SIOCGIFCONF data corruption 2005-11-20 13:41:59 -08:00
dcache.c [PATCH] Remove hlist_for_each_rcu() API, convert existing use to hlist_for_each_entry_rcu 2005-11-07 07:53:35 -08:00
dcookies.c [PATCH] dcookies.c: use proper refcounting functions 2005-07-07 18:23:52 -07:00
direct-io.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00
dnotify.c
…
dquot.c [PATCH] Fix oops in vfs_quotaon_mount() 2005-11-28 14:42:26 -08:00
drop_caches.c [PATCH] drop-pagecache 2006-01-08 20:12:40 -08:00
eventpoll.c [PATCH] epoll: handle timeout overflow 2005-09-28 07:46:41 -07:00
exec.c [PATCH] RCU signal handling 2006-01-08 20:13:40 -08:00
fcntl.c [PATCH] files: lock-free fd look-up 2005-09-09 13:57:55 -07:00
fifo.c
…
file.c [PATCH] Fix the fdtable freeing in the case of vmalloced fdset/arrays 2005-09-14 12:38:26 -07:00
file_table.c [PATCH] mm: rename kmem_cache_s to kmem_cache 2005-11-07 07:53:24 -08:00
filesystems.c [PATCH] fix missing includes 2005-10-30 17:37:32 -08:00
fs-writeback.c [PATCH] kernel-docs: fix kernel-doc format problems 2005-11-07 07:53:55 -08:00
inode.c [PATCH] fix nr_unused accounting, and avoid recursing in iput with I_WILL_FREE set 2005-10-30 17:37:26 -08:00
inotify.c [PATCH] inotify: add two inotify_add_watch flags 2005-12-12 08:57:43 -08:00
ioctl.c
…
ioprio.c fs/ioprio.c should #include <linux/syscalls.h> 2005-11-08 16:57:02 +01:00
libfs.c
…
locks.c NLM: Further cancel fixes 2006-01-06 14:58:54 -05:00
mbcache.c [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
mpage.c [PATCH] add AOP_TRUNCATED_PAGE, prepend AOP_ to WRITEPAGE_ACTIVATE 2006-01-03 11:45:42 -08:00
namei.c [PATCH] fs/namei.c: make path_lookup_create() static 2005-11-09 07:56:40 -08:00
namespace.c [PATCH] add a vfs_permission helper 2005-11-09 07:55:58 -08:00
nfsctl.c
…
open.c [PATCH] add a file_permission helper 2005-11-09 07:55:59 -08:00
pipe.c [PATCH] sched: TASK_NONINTERACTIVE 2005-09-10 10:06:22 -07:00
pnode.c [PATCH] unbindable mounts 2005-11-07 18:18:11 -08:00
pnode.h [PATCH] unbindable mounts 2005-11-07 18:18:11 -08:00
posix_acl.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
quota.c [PATCH] quota: small cleanups 2005-11-07 07:53:39 -08:00
quota_v1.c
…
quota_v2.c
…
read_write.c Relax the rw_verify_area() error checking. 2006-01-04 16:20:40 -08:00
readdir.c
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select.c [PATCH] files: lock-free fd look-up 2005-09-09 13:57:55 -07:00
seq_file.c [PATCH] allow callers of seq_open do allocation themselves 2005-11-07 18:18:09 -08:00
stat.c
…
super.c [PATCH] remove mount/umount uevents from superblock handling 2006-01-04 16:18:07 -08:00
xattr.c [PATCH] Fix listxattr() for generic security attributes 2005-12-12 08:57:42 -08:00
xattr_acl.c
…