Subject: Re: New (now current development process)
Newsgroups: gmane.linux.kernel
Date: 2005-11-01 14:08:13 GMT (3 years, 35 weeks, 14 hours and 28 minutes ago)
On Mon, Oct 31, 2005 at 04:34:08PM -0800, Andrew Morton wrote: > Linus Torvalds <torvalds <at> osdl.org> wrote: > > > > > > > > On Mon, 31 Oct 2005, Andrew Morton wrote: > > > > > > Are you sure these kernels are feature-equivalent? > > > > They may not be feature-equivalent in reality, but it's hard to generate > > something that has the features (or lack there-of) of old kernels these > > days. Which is problematic. > > Probably. > > > But some of it is likely also compilers. gcc does insane padding in many > > cases these days. > > 2.6.14 `make allnoconfig': > > gcc-2.95.4: > > bix:/usr/src/25> size vmlinux > text data bss dec hex filename > 665502 152379 55120 873001 d5229 vmlinux > > gcc version 4.1.0 20050513 (experimental): > > bix:/usr/src/25> size vmlinux > text data bss dec hex filename > 761415 151851 55280 968546 ec762 vmlinux That's not a fair comparison. If you do not tell gcc to optimize for size you can't expect it to produce small code. The following is with allnoconfig + CONFIG_EMBEDDED=y + intelligent setting of the options shown by "make oldconfig" after setting CONFIG_EMBEDDED=y (the third kernel is built without -fno-unit-at-a-time): text data bss dec hex filename 522545 77694 31256 631495 9a2c7 vmlinux-2.95 436878 76594 32248 545720 853b8 vmlinux-4.0 429420 76370 32184 537974 83576 vmlinux-4.0-unit-at-a-time > (There's a new reason for retaining gcc-2.95.x support) >... There's a new reason for removing gcc-2.95.x support.cu Adrian -- "Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed