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4f035ad67f
linux/lib
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Michel Lespinasse 4f035ad67f rbtree: low level optimizations in rb_erase() 
Various minor optimizations in rb_erase():
- Avoid multiple loading of node->__rb_parent_color when computing parent
  and color information (possibly not in close sequence, as there might
  be further branches in the algorithm)
- In the 1-child subcase of case 1, copy the __rb_parent_color field from
  the erased node to the child instead of recomputing it from the desired
  parent and color
- When searching for the erased node's successor, differentiate between
  cases 2 and 3 based on whether any left links were followed. This avoids
  a condition later down.
- In case 3, keep a pointer to the erased node's right child so we don't
  have to refetch it later to adjust its parent.
- In the no-childs subcase of cases 2 and 3, place the rebalance assigment
  last so that the compiler can remove the following if(rebalance) test.

Also, added some comments to illustrate cases 2 and 3.

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-09 16:22:37 +09:00
..
lzo
mpi Remove unused code from MPI library 2012-05-26 11:51:03 +10:00
raid6 lib/raid6: fix sparse warnings in recovery functions 2012-05-28 14:10:22 +10:00
reed_solomon
xz XZ: Fix incorrect XZ_BUF_ERROR 2011-09-21 13:39:59 -07:00
zlib_deflate zlib: slim down zlib_deflate() workspace when possible 2011-03-22 17:44:17 -07:00
zlib_inflate inflate_fast: sout is already a short so ptr arith was off by one. 2010-03-12 15:52:44 -08:00
.gitignore
argv_split.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
atomic64_test.c atomic64_test: simplify the #ifdef for atomic64_dec_if_positive() test 2012-07-30 17:25:16 -07:00
atomic64.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
audit.c audit: support the "standard" <asm-generic/unistd.h> 2011-05-04 14:41:28 -04:00
average.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
bcd.c usb/core: use bin2bcd() for bcdDevice in RH 2012-09-10 11:13:16 -07:00
bch.c lib: add shared BCH ECC library 2011-03-11 14:25:50 +00:00
bitmap.c lib/bitmap.c: fix documentation for scnprintf() functions 2012-05-29 16:22:32 -07:00
bitrev.c
bsearch.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
btree.c btree: catch NULL value before it does harm 2012-06-07 14:43:55 -07:00
bug.c bugs, x86: Fix printk levels for panic, softlockups and stack dumps 2012-01-26 21:28:45 +01:00
bust_spinlocks.c
check_signature.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
checksum.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
clz_tab.c lib: Fix multiple definitions of clz_tab 2012-02-02 10:34:23 +11:00
cmdline.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
cordic.c Docs: wording: functions -> algorithm 2011-10-29 21:20:22 +02:00
cpu_rmap.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
cpu-notifier-error-inject.c cpu: rewrite cpu-notifier-error-inject module 2012-07-30 17:25:22 -07:00
cpumask.c lib/cpumask.c: remove __any_online_cpu() 2012-03-28 17:14:35 -07:00
crc7.c
crc8.c lib: crc8: add new library module providing crc8 algorithm 2011-06-03 15:01:06 -04:00
crc16.c
crc32.c sections: fix const sections for crc32 table 2012-10-06 03:04:46 +09:00
crc32defs.h crc32: select an algorithm via Kconfig 2012-03-23 16:58:38 -07:00
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
ctype.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
debug_locks.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
debugobjects.c debugobjects: Fill_pool() returns void now 2012-04-18 13:38:48 +02:00
dec_and_lock.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
decompress_bunzip2.c decompress_bunzip2: remove invalid vi modeline 2011-12-06 10:00:05 +01:00
decompress_inflate.c decompressors: check input size in decompress_inflate.c 2011-01-13 08:03:25 -08:00
decompress_unlzma.c treewide: Fix comment and string typo 'bufer' 2011-12-06 09:53:40 +01:00
decompress_unlzo.c unlzo: fix input buffer free 2012-01-12 20:13:13 -08:00
decompress_unxz.c Fix common misspellings 2011-03-31 11:26:23 -03:00
decompress.c lib/decompress.c add __init to decompress_method and data 2012-10-06 03:05:32 +09:00
devres.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
digsig.c digsig: add hash size comparision on signature verification 2012-09-13 09:13:02 +08:00
div64.c lib: correct link to the original source for div64_u64 2012-06-28 11:51:39 +02:00
dma-debug.c dma-debug: Remove local BUS_NOTIFY_UNBOUND_DRIVER define 2012-10-02 12:10:27 +02:00
dump_stack.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
dynamic_debug.c device and dynamic_debug: Use dev_vprintk_emit and dev_printk_emit 2012-09-17 06:10:05 -07:00
dynamic_queue_limits.c bql: Avoid possible inconsistent calculation. 2012-05-31 18:18:17 -04:00
extable.c
fault-inject.c fault-inject: avoid call to random32() if fault injection is disabled 2012-06-20 14:39:36 -07:00
fdt_ro.c of/lib: Allow scripts/dtc/libfdt to be used from kernel code 2012-07-23 13:54:52 +01:00
fdt_rw.c of/lib: Allow scripts/dtc/libfdt to be used from kernel code 2012-07-23 13:54:52 +01:00
fdt_strerror.c of/lib: Allow scripts/dtc/libfdt to be used from kernel code 2012-07-23 13:54:52 +01:00
fdt_sw.c of/lib: Allow scripts/dtc/libfdt to be used from kernel code 2012-07-23 13:54:52 +01:00
fdt_wip.c of/lib: Allow scripts/dtc/libfdt to be used from kernel code 2012-07-23 13:54:52 +01:00
fdt.c of/lib: Allow scripts/dtc/libfdt to be used from kernel code 2012-07-23 13:54:52 +01:00
find_last_bit.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
find_next_bit.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
flex_array.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
flex_proportions.c lib/flex_proportions.c: fix corruption of denominator in flexible proportions 2012-09-25 08:59:21 -07:00
gcd.c lib/gcd.c: prevent possible div by 0 2012-10-06 03:04:57 +09:00
gen_crc32table.c sections: fix const sections for crc32 table 2012-10-06 03:04:46 +09:00
genalloc.c genalloc: make it possible to use a custom allocation algorithm 2012-10-06 03:04:57 +09:00
halfmd4.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
hexdump.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
hweight.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
idr.c idr: rename MAX_LEVEL to MAX_IDR_LEVEL 2012-10-06 03:04:56 +09:00
inflate.c MN10300: Don't try and #include <linux/slab.h> in lib/inflate.c from bootloader 2010-08-12 09:51:35 -07:00
int_sqrt.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
iomap_copy.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
iomap.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
iommu-helper.c The following text was taken from the original review request: 2012-03-24 10:24:31 -07:00
ioremap.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
irq_regs.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
is_single_threaded.c
jedec_ddr_data.c ddr: add LPDDR2 data from JESD209-2 2012-05-02 00:04:06 -07:00
kasprintf.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
Kconfig Merge branch 'akpm' (Andrew's patch-bomb) 2012-07-30 17:25:34 -07:00
Kconfig.debug rbtree: performance and correctness test 2012-10-09 16:22:33 +09:00
Kconfig.kgdb mips,kgdb: kdb low level trap catch and stack trace 2010-05-20 21:04:26 -05:00
Kconfig.kmemcheck
klist.c Revert "driver core: check start node in klist_iter_init_node" 2012-04-19 19:17:30 -07:00
kobject_uevent.c netlink: hide struct module parameter in netlink_kernel_create 2012-09-08 18:46:30 -04:00
kobject.c kobject: fix the uncorrect comment 2012-05-07 16:51:19 -07:00
kstrtox.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
kstrtox.h lib/kstrtox: common code between kstrto*() and simple_strto*() functions 2011-10-31 17:30:56 -07:00
lcm.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
libcrc32c.c
list_debug.c rcu: Fix broken strings in RCU's source code. 2012-07-06 06:01:49 -07:00
list_sort.c lib/list_sort: test: check element addresses 2010-10-26 16:52:19 -07:00
llist.c Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
locking-selftest-hardirq.h
locking-selftest-mutex.h
locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h
locking-selftest-wlock.h
locking-selftest-wsem.h
locking-selftest.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
lru_cache.c lru_cache: use correct type in sizeof for allocation 2011-05-25 08:39:52 -07:00
Makefile rbtree: performance and correctness test 2012-10-09 16:22:33 +09:00
md5.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
memory-notifier-error-inject.c memory: memory notifier error injection module 2012-07-30 17:25:22 -07:00
memweight.c string: introduce memweight() 2012-07-30 17:25:16 -07:00
nlattr.c netlink: add minlen validation for the new signed types 2012-08-30 13:11:46 -04:00
notifier-error-inject.c fault-injection: notifier error injection 2012-07-30 17:25:22 -07:00
notifier-error-inject.h fault-injection: notifier error injection 2012-07-30 17:25:22 -07:00
parser.c lib/parser.c: avoid overflow in match_number() 2012-10-06 03:04:56 +09:00
pci_iomap.c lib: add NO_GENERIC_PCI_IOPORT_MAP 2012-01-31 23:19:47 +02:00
percpu_counter.c switch the protection of percpu_counter list to spinlock 2012-07-31 09:28:31 +04:00
plist.c lib/plist.c: make plist test announcements KERN_DEBUG 2012-10-06 03:04:58 +09:00
pm-notifier-error-inject.c PM: PM notifier error injection module 2012-07-30 17:25:22 -07:00
prio_heap.c
prio_tree.c prio_tree: introduce prio_set_parent() 2012-03-23 16:58:36 -07:00
proportions.c locking, lib/proportions: Annotate prop_local_percpu::lock as raw 2011-09-13 11:11:50 +02:00
pSeries-reconfig-notifier-error-inject.c powerpc: pSeries reconfig notifier error injection module 2012-07-30 17:25:22 -07:00
radix-tree.c radix-tree: fix contiguous iterator 2012-06-05 10:46:40 -07:00
random32.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
ratelimit.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
rational.c lib: Change mail address of Oskar Schirmer 2012-05-17 15:18:37 +02:00
rbtree_test.c rbtree test: fix sparse warning about 64-bit constant 2012-10-09 16:22:36 +09:00
rbtree.c rbtree: low level optimizations in rb_erase() 2012-10-09 16:22:37 +09:00
reciprocal_div.c sch_red: Adaptative RED AQM 2011-12-08 19:52:43 -05:00
rwsem-spinlock.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
rwsem.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
scatterlist.c scatterlist: atomic sg_mapping_iter() no longer needs disabled IRQs 2012-10-06 03:04:58 +09:00
sha1.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
show_mem.c arch, mm: filter disallowed nodes from arch specific show_mem functions 2011-05-25 08:39:03 -07:00
smp_processor_id.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
sort.c
spinlock_debug.c lib/spinlock_debug: avoid livelock in do_raw_spin_lock() 2012-10-06 03:04:57 +09:00
stmp_device.c lib: add support for stmp-style devices 2012-04-20 23:27:08 +02:00
string_helpers.c lib/string_helpers.c: make arrays static 2012-05-29 16:22:32 -07:00
string.c The following text was taken from the original review request: 2012-03-24 10:24:31 -07:00
strncpy_from_user.c word-at-a-time: make the interfaces truly generic 2012-05-26 11:33:40 -07:00
strnlen_user.c lib: Fix generic strnlen_user for 32-bit big-endian machines 2012-05-27 20:59:46 -07:00
swiotlb.c swiotlb: add the late swiotlb initialization function with iotlb memory 2012-08-21 14:47:25 -04:00
syscall.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
test-kstrtox.c lib/test-kstrtox.c: mark const init data with __initconst instead of __initdata 2012-05-29 16:22:32 -07:00
textsearch.c textsearch: doc - fix spelling in lib/textsearch.c. 2011-01-24 23:33:30 -08:00
timerqueue.c The following text was taken from the original review request: 2012-03-24 10:24:31 -07:00
ts_bm.c
ts_fsm.c
ts_kmp.c
uuid.c lib: reduce the use of module.h wherever possible 2012-03-07 15:04:04 -05:00
vsprintf.c lib/vsprintf.c: improve standard conformance of sscanf() 2012-10-06 03:04:58 +09:00