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| author | Eric Dumazet <dada1@cosmosbay.com> | 2006-03-25 12:08:19 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-25 17:23:01 +0100 |
| commit | d74beb9f33a5f16d2965f11b275e401f225c949d (patch) | |
| tree | 48f851753ebe9c9c8dd701dcdd0c5e1d7c629579 /Documentation/sched-stats.txt | |
| parent | [PATCH] Check if cpu can be onlined before calling smp_prepare_cpu() (diff) | |
| download | linux-d74beb9f33a5f16d2965f11b275e401f225c949d.tar.xz linux-d74beb9f33a5f16d2965f11b275e401f225c949d.zip | |
[PATCH] Use unsigned int types for a faster bsearch
This patch avoids arithmetic on 'signed' types that are slower than
'unsigned'. This saves space and cpu cycles.
size of kernel/sys.o before the patch (gcc-3.4.5)
text data bss dec hex filename
10924 252 4 11180 2bac kernel/sys.o
size of kernel/sys.o after the patch
text data bss dec hex filename
10903 252 4 11159 2b97 kernel/sys.o
I noticed that gcc-4.1.0 (from Fedora Core 5) even uses idiv instruction for
(a+b)/2 if a and b are signed.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/sched-stats.txt')
0 files changed, 0 insertions, 0 deletions