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Nick Piggin 95b35127f1 slob: rework freelist handling ... Improve slob by turning the freelist into a list of pages using struct page fields, then each page has a singly linked freelist of slob blocks via a pointer in the struct page. - The first benefit is that the slob freelists can be indexed by a smaller type (2 bytes, if the PAGE_SIZE is reasonable). - Next is that freeing is much quicker because it does not have to traverse the entire freelist. Allocation can be slightly faster too, because we can skip almost-full freelist pages completely. - Slob pages are then freed immediately when they become empty, rather than having a periodic timer try to free them. This gives efficiency and memory consumption improvement. Then, we don't encode seperate size and next fields into each slob block, rather we use the sign bit to distinguish between "size" or "next". Then size 1 blocks contain a "next" offset, and others contain the "size" in the first unit and "next" in the second unit. - This allows minimum slob allocation alignment to go from 8 bytes to 2 bytes on 32-bit and 12 bytes to 2 bytes on 64-bit. In practice, it is best to align them to word size, however some architectures (eg. cris) could gain space savings from turning off this extra alignment. Then, make kmalloc use its own slob_block at the front of the allocation in order to encode allocation size, rather than rely on not overwriting slob's existing header block. - This reduces kmalloc allocation overhead similarly to alignment reductions. - Decouples kmalloc layer from the slob allocator. Then, add a page flag specific to slob pages. - This means kfree of a page aligned slob block doesn't have to traverse the bigblock list. I would get benchmarks, but my test box's network doesn't come up with slob before this patch. I think something is timing out. Anyway, things are faster after the patch. Code size goes up about 1K, however dynamic memory usage _should_ be lower even on relatively small memory systems. Future todo item is to restore the cyclic free list search, rather than to always begin at the start. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		18 years ago
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Kconfig	sh64: generic quicklist support.	18 years ago
Makefile	Quicklists for page table pages	18 years ago
allocpercpu.c	…
backing-dev.c	…
bootmem.c	…
bounce.c	…
fadvise.c	…
filemap.c	sendfile: kill generic_file_sendfile()	18 years ago
filemap.h	…
filemap_xip.c	xip sendfile removal	18 years ago
fremap.c	…
highmem.c	…
hugetlb.c	hugetlb: remove unnecessary nid initialization	18 years ago
internal.h	Make page->private usable in compound pages	18 years ago
madvise.c	Detach sched.h from mm.h	18 years ago
memory.c	MM: use DIV_ROUND_UP() in mm/memory.c	18 years ago
memory_hotplug.c	memory hotplug: fix unnecessary calling of init_currenty_empty_zone()	18 years ago
mempolicy.c	…
mempool.c	…
migrate.c	…
mincore.c	…
mlock.c	Detach sched.h from mm.h	18 years ago
mmap.c	security: Protection for exploiting null dereference using mmap	18 years ago
mmzone.c	…
mprotect.c	…
mremap.c	security: Protection for exploiting null dereference using mmap	18 years ago
msync.c	Detach sched.h from mm.h	18 years ago
nommu.c	security: Protection for exploiting null dereference using mmap	18 years ago
oom_kill.c	oom: fix constraint deadlock	18 years ago
page-writeback.c	consolidate generic_writepages and mpage_writepages	18 years ago
page_alloc.c	MM: alloc_large_system_hash() can free some memory for non power-of-two bucketsize	18 years ago
page_io.c	…
pdflush.c	…
prio_tree.c	…
quicklist.c	Quicklists for page table pages	18 years ago
readahead.c	readahead: code cleanup	18 years ago
rmap.c	mm: kill validate_anon_vma to avoid mapcount BUG	18 years ago
shmem.c	shmem: convert to using splice instead of sendfile()	18 years ago
shmem_acl.c	…
slab.c	Make /proc/slabinfo use seq_list_xxx helpers	18 years ago
slob.c	slob: rework freelist handling	18 years ago
slub.c	slub: remove useless EXPORT_SYMBOL	18 years ago
sparse.c	Move three functions that are only needed for CONFIG_MEMORY_HOTPLUG	18 years ago
swap.c	Add suspend-related notifications for CPU hotplug	18 years ago
swap_state.c	…
swapfile.c	mm: make read_cache_page synchronous	18 years ago
thrash.c	Bug in mm/thrash.c function grab_swap_token()	18 years ago
tiny-shmem.c	…
truncate.c	fs: convert core functions to zero_user_page	18 years ago
util.c	…
vmalloc.c	Make __vunmap static	18 years ago
vmscan.c	Add suspend-related notifications for CPU hotplug	18 years ago
vmstat.c	mm: fixup /proc/vmstat output	18 years ago