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
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bootmem.c	[PATCH] FRV: Clean up bootmem allocator's page freeing algorithm	2006-01-06 08:33:26 -08:00
fadvise.c	[PATCH] xip: madvice/fadvice: execute in place	2005-06-24 00:06:42 -07:00
filemap.c	[PATCH] find_lock_page(): call __lock_page() directly.	2006-01-06 08:33:26 -08:00
filemap.h
filemap_xip.c	[PATCH] mm: rmap with inner ptlock	2005-10-29 21:40:41 -07:00
fremap.c	VM: add common helper function to create the page tables	2005-11-29 14:03:14 -08:00
highmem.c	[PATCH] gfp_t: the rest	2005-10-28 08:16:51 -07:00
hugetlb.c	[PATCH] mm: make hugepages obey cpusets.	2006-01-08 20:12:43 -08:00
internal.h	[PATCH] FRV: Clean up bootmem allocator's page freeing algorithm	2006-01-06 08:33:26 -08:00
Kconfig	[PATCH] Swap Migration V5: Add CONFIG_MIGRATION for page migration support	2006-01-08 20:12:41 -08:00
madvise.c	[PATCH] madvise(MADV_REMOVE): remove pages from tmpfs shm backing store	2006-01-06 08:33:22 -08:00
Makefile	[PATCH] slob: introduce the SLOB allocator	2006-01-08 20:13:41 -08:00
memory.c	[PATCH] mm: pfault optimisation	2006-01-06 08:33:27 -08:00
memory_hotplug.c	[PATCH] memhotplug: __add_section remove unused pgdat definition	2006-01-06 08:33:21 -08:00
mempolicy.c	[PATCH] Move page migration related functions near do_migrate_pages()	2006-01-08 20:12:44 -08:00
mempool.c	[PATCH] gfp_t: mm/* (easy parts)	2005-10-28 08:16:47 -07:00
mincore.c
mlock.c
mmap.c	Make sure we copy pages inserted with "vm_insert_page()" on fork	2005-12-16 10:21:23 -08:00
mprotect.c	[PATCH] unpaged: private write VM_RESERVED	2005-11-22 09:13:42 -08:00
mremap.c	Make sure we copy pages inserted with "vm_insert_page()" on fork	2005-12-16 10:21:23 -08:00
msync.c	mm: re-architect the VM_UNPAGED logic	2005-11-28 14:34:23 -08:00
nommu.c	[PATCH] NOMMU: Make SYSV IPC SHM use ramfs facilities on NOMMU	2006-01-06 08:33:32 -08:00
oom_kill.c	[PATCH] Optimise oom kill of current task	2006-01-08 20:12:45 -08:00
page-writeback.c	identify multipage ->writepages() calls	2006-01-06 14:58:38 -05:00
page_alloc.c	[PATCH] mm: free_pages opt	2006-01-08 20:12:40 -08:00
page_io.c	[PATCH] mm: split page table lock	2005-10-29 21:40:42 -07:00
pdflush.c	[PATCH] Swap Migration V5: PF_SWAPWRITE to allow writing to swap	2006-01-08 20:12:41 -08:00
prio_tree.c
readahead.c	[PATCH] add AOP_TRUNCATED_PAGE, prepend AOP_ to WRITEPAGE_ACTIVATE	2006-01-03 11:45:42 -08:00
rmap.c	[PATCH] rmap: additional diagnostics in page_remove_rmap()	2006-01-08 20:12:44 -08:00
shmem.c	[PATCH] NOMMU: Make SYSV IPC SHM use ramfs facilities on NOMMU	2006-01-06 08:33:32 -08:00
slab.c	[PATCH] slob: introduce mm/util.c for shared functions	2006-01-08 20:13:41 -08:00
slob.c	[PATCH] slob: introduce the SLOB allocator	2006-01-08 20:13:41 -08:00
sparse.c	[PATCH] Change maxaligned_in_smp alignemnt macros to internodealigned_in_smp macros	2006-01-08 20:13:38 -08:00
swap.c	[PATCH] consolidate lru_add_drain() and lru_drain_cache()	2006-01-06 08:33:28 -08:00
swap_state.c	[PATCH] SwapMig: add_to_swap() avoid atomic allocations	2006-01-08 20:12:42 -08:00
swapfile.c	[PATCH] mm: clean up local variables	2006-01-08 20:12:43 -08:00
thrash.c	[PATCH] temporarily disable swap token on memory pressure	2005-11-28 14:42:25 -08:00
tiny-shmem.c	[PATCH] NOMMU: Make SYSV IPC SHM use ramfs facilities on NOMMU	2006-01-06 08:33:32 -08:00
truncate.c	[PATCH] drop-pagecache	2006-01-08 20:12:40 -08:00
util.c	[PATCH] slob: introduce mm/util.c for shared functions	2006-01-08 20:13:41 -08:00
vmalloc.c	[PATCH] kernel-doc: fix warnings in vmalloc.c	2005-11-07 07:53:56 -08:00
vmscan.c	[PATCH] SwapMig: Switch error handling in migrate_pages to use -Exx	2006-01-08 20:12:42 -08:00