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612d6c19db
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Nick Piggin 612d6c19db [PATCH] radix-tree: direct data 
The ability to have height 0 radix trees (a direct pointer to the data item
rather than going through a full node->slot) quietly disappeared with
old-2.6-bkcvs commit ffee171812d51652f9ba284302d9e5c5cc14bdfd.  On 64-bit
machines this causes nearly 600 bytes to be used for every <= 4K file in
pagecache.

Re-introduce this feature, root tags stored in spare ->gfp_mask bits.

Simplify radix_tree_delete's complex tag clearing arrangement (which would
become even more complex) by just falling back to tag clearing functions
(the pagecache radix-tree never uses this path anyway, so the icache
savings will mean it's actually a speedup).

On my 4GB G5, this saves 8MB RAM per kernel kernel source+object tree in
pagecache.

Pagecache lookup, insertion, and removal speed for small files will also be
improved.

This makes RCU radix tree harder, but it's worth it.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 07:42:49 -07:00
..
reed_solomon [PATCH] sem2mutex: kernel/ 2006-03-23 07:38:10 -08:00
zlib_deflate [PATCH] zlib_inflate: Upgrade library code to a recent version 2006-06-22 15:05:58 -07:00
zlib_inflate [PATCH] zlib_inflate: Upgrade library code to a recent version 2006-06-22 15:05:58 -07:00
.gitignore Add some basic .gitignore files 2005-10-18 08:26:15 -07:00
bitmap.c [PATCH] bitops: hweight() related cleanup 2006-03-26 08:57:15 -08:00
bust_spinlocks.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cmdline.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpumask.c [PATCH] cpumask: uninline any_online_cpu() 2006-03-25 08:23:00 -08:00
crc16.c [PATCH] lib/crc16: added crc16 algorithm. 2005-09-08 14:41:27 -07:00
crc32.c [PATCH] crc32.c typo fix 2005-08-07 10:00:40 -07:00
crc32defs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
crc-ccitt.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ctype.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dec_and_lock.c [PATCH] atomic: dec_and_lock use atomic primitives 2006-01-08 20:13:48 -08:00
div64.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dump_stack.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
errno.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
extable.c [PATCH] powerpc: trivial: modify comments to refer to new location of files 2006-02-10 16:53:51 +11:00
find_next_bit.c [PATCH] bitops: generic ext2_{set,clear,test,find_first_zero,find_next_zero}_bit() 2006-03-26 08:57:11 -08:00
gen_crc32table.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
genalloc.c [PATCH] change gen_pool allocator to not touch managed memory 2006-06-23 07:42:49 -07:00
halfmd4.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hweight.c [PATCH] bitops: hweight() speedup 2006-03-26 08:59:30 -08:00
idr.c [PATCH] Whitespace and CodingStyle cleanup for lib/idr.c 2005-10-30 17:37:19 -08:00
inflate.c [PATCH] Update in-kernel zlib routines 2005-08-05 16:23:21 -07:00
int_sqrt.c [PATCH] lib: Fix bug in int_sqrt() for 64 bit longs 2006-02-03 08:32:08 -08:00
iomap_copy.c [PATCH] add __iowrite64_copy 2006-06-20 20:24:58 -07:00
iomap.c [PATCH] add Big Endian variants of ioread/iowrite 2005-04-16 15:25:54 -07:00
Kconfig [PATCH] lib/crc16: added crc16 algorithm. 2005-09-08 14:41:27 -07:00
Kconfig.debug [SPARC]: Handle UNWIND_INFO properly. 2006-05-12 12:45:50 -07:00
kernel_lock.c [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
klist.c [PATCH] klist: Fix broken kref counting in find functions 2006-01-04 16:18:08 -08:00
kobject_uevent.c [PATCH] Kobject: fix build error 2006-04-27 13:08:56 -07:00
kobject.c [PATCH] kobject: make people pay attention to kobject_add errors 2006-06-21 12:40:47 -07:00
kref.c [PATCH] kref: avoid an atomic operation in kref_put() 2006-03-20 13:42:57 -08:00
libcrc32c.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Makefile [PATCH] bitops: generic hweight{64,32,16,8}() 2006-03-26 08:57:11 -08:00
parser.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
prio_tree.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
radix-tree.c [PATCH] radix-tree: direct data 2006-06-23 07:42:49 -07:00
rbtree.c [RBTREE] Switch rb_colour() et al to en_US spelling of 'color' for consistency 2006-06-05 20:19:05 +01:00
rwsem-spinlock.c [PATCH] use smp_mb/wmb/rmb where possible 2005-05-01 08:58:47 -07:00
rwsem.c [PATCH] use smp_mb/wmb/rmb where possible 2005-05-01 08:58:47 -07:00
semaphore-sleepers.c [PATCH] unify x86/x86-64 semaphore code 2005-09-05 00:06:14 -07:00
sha1.c [PATCH] lib/sha1.c: fix sparse warning 2005-06-25 16:25:02 -07:00
smp_processor_id.c [PATCH] fix missing includes 2005-10-30 17:37:32 -08:00
sort.c [PATCH] fix missing includes 2005-10-30 17:37:32 -08:00
spinlock_debug.c [PATCH] Fix spinlock debugging delays to not time out too early 2006-02-07 16:12:33 -08:00
string.c [PATCH] Silence a const vs non-const warning 2006-04-11 06:18:42 -07:00
swiotlb.c BUG_ON() Conversion in lib/swiotlb.c 2006-03-24 18:47:11 +01:00
textsearch.c [PATCH] gfp_t: lib/* 2005-10-28 08:16:47 -07:00
ts_bm.c [TEXTSEARCH]: Fix broken good shift array calculation in Boyer-Moore 2006-02-02 17:15:41 -08:00
ts_fsm.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
ts_kmp.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
vsprintf.c [PATCH] fix missing includes 2005-10-30 17:37:32 -08:00