![]() 'make randconfig' uses glibc's rand function, and the seed of that PRNG is set via: srand(time(NULL)); But 'time()' only increases once every second - freezing the randconfig result within a single second. My Nehalem testbox does randconfig much faster than 1 second and i have a few scripts that do 'randconfig until condition X' loops. Those scripts currently waste a lot of CPU time due to randconfig changing its seed only once per second currently. Change the seed to be micrseconds based. (I checked the statistical spread of the seed - the now.tv_sec*now.tv_usec multiplication there further improves it.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Roman Zippel <zippel@linux-m68k.org> [sam: fix for systems where usec is zero - noticed by Geert Uytterhoeven] Signed-off-by: Sam Ravnborg <sam@ravnborg.org> |
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.. | ||
lxdialog | ||
.gitignore | ||
check.sh | ||
conf.c | ||
confdata.c | ||
expr.c | ||
expr.h | ||
gconf.c | ||
gconf.glade | ||
images.c | ||
kconfig_load.c | ||
kxgettext.c | ||
lex.zconf.c_shipped | ||
lkc.h | ||
lkc_proto.h | ||
Makefile | ||
mconf.c | ||
menu.c | ||
POTFILES.in | ||
qconf.cc | ||
qconf.h | ||
symbol.c | ||
util.c | ||
zconf.gperf | ||
zconf.hash.c_shipped | ||
zconf.l | ||
zconf.tab.c_shipped | ||
zconf.y |