On 2015.04.12 at 07:47 +0200, Ingo Molnar wrote: > > * Linus Torvalds <torva...@linux-foundation.org> wrote: > > > On Sat, Apr 11, 2015 at 11:57 AM, Thomas Gleixner <t...@linutronix.de> > > wrote: > > > > > > I thinks its just the no-guess one: > > > > > > text data dec patch reduction > > > 7563475 1781048 10302987 > > > 7192973 1780024 9931461 no-guess -4.8% > > > 7354819 1781048 958464 align-1 -2.7% > > > 7192973 1780024 9931461 no-guess + align-1 -4.8% > > > > Yeah, a 5% code expansion is a big deal. Sadly, it looks like > > 'no-guess' also disables our explicit likely/unlikely handling. > > So I spent some time trying to get as much code size reduction as > possible via GCC optimization options, and the total savings possible > are 10.1%: > > text data bss dec filename > 12566391 1617840 1089536 15273767 vmlinux.vanilla > 11416805 1617840 1089536 14124181 vmlinux.combo > 10532552 1596080 1089536 13218168 vmlinux.Os
If you like to play with more knobs you could explore the various --param options that are listed in the gcc man page... -- Markus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
