Messages in this thread | | | Date | Wed, 5 Jul 2006 21:35:51 +0200 | From | Ingo Molnar <> | Subject | Re: [patch] uninline init_waitqueue_*() functions |
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* Andrew Morton <akpm@osdl.org> wrote:
> > > > text data bss dec filename > > > > 21172153 6077270 3081864 30331287 vmlinux.x32.after > > > > 21198222 6077106 3081864 30357192 vmlinux.x32.before > > > > > > > > with 851 callsites that's a 30.6 bytes win per call site (total 26K) - > > > > still not bad at all. > > > > > > and that was with CONFIG_CC_OPTIMIZE_FOR_SIZE enabled. With > > > optimize-for-size disabled the win goes up to 32.6 bytes (total 28K). > > > > i also tried a config with the best size settings (disabling > > FRAME_POINTER, enabling CC_OPTIMIZE_FOR_SIZE), and this gives: > > > > text data bss dec filename > > 20777768 6076042 3081864 29935674 vmlinux.x32.size.before > > 20748140 6076178 3081864 29906182 vmlinux.x32.size.after > > > > or a 34.8 bytes win per callsite (29K total). > > > > With gcc-4.1.0 on i686, uninlining those three functions as per the > below patch _increases_ the allnoconfig vmlinux's .text from 833456 > bytes to 833728.
that's just the effect of CONFIG_REGPARM and CONFIG_CC_OPTIMIZE_FOR_SIZE not being set in an allnoconfig. Once i set them the text size evens out:
431348 60666 27276 519290 7ec7a vmlinux.x32.mini.before 431359 60666 27276 519301 7ec85 vmlinux.x32.mini.after
compiling without CONFIG_REGPARM on i686 (if you care about text size) makes little sense. It penalizes function calls artificially.
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