Hi drew, On Wed, Aug 21, 2024 at 2:18 PM Andrew Jones <ajones@xxxxxxxxxxxxxxxx> wrote: > > On Sat, Aug 17, 2024 at 01:08:34PM GMT, Guo Ren wrote: > ... > > > So I have just checked the size of the jump table section: > > > > > > * defconfig: > > > > > > - ticket: 26928 bytes > > > - combo: 28320 bytes > > > > > > So that's a ~5% increase. > > > > > > * ubuntu config > > > > > > - ticket: 107840 bytes > > > - combo: 174752 bytes > > > > > > And that's a ~62% increase. > > The size of the jump table section has increased from 5% to 62%. I > > think some configuration triggers the jump table's debug code. If it's > > not a debugging configuration, that's a bug of the Ubuntu config. > > And I just remembered we wanted to check with CONFIG_CC_OPTIMIZE_FOR_SIZE Here we go! The size of the jump table section: * defconfig: - ticket: 12176 bytes - combo: 13168 bytes So that's a ~8% increase. * ubuntu config - ticket: 73920 bytes - combo: 84656 bytes And that's a ~14% increase. This is the ELF size difference between ticket and combo spinlocks: * ticket: 695906872 bytes * combo: 697558496 bytes So that's an increase of ~0.23% on the ELF. And the .text section size: * ticket: 10322820 bytes * combo: 10332136 bytes And that's a ~0.09% increase! So that's even better :) Thanks for asking! Alex > > Thanks, > drew > > > > > > > > > This is the ELF size difference between ticket and combo spinlocks: > > > > > > * ticket: 776915592 bytes > > > * combo: 786958968 bytes > > > > > > So that's an increase of ~1.3% on the ELF. > > > > > > And the .text section size: > > > > > > * ticket: 12290960 bytes > > > * combo: 12366644 bytes > > > > > > And that's a ~0.6% increase! > > > > > > Finally, I'd say the impact is very limited :) > > > > > > Thanks, > > > > > > Alex > > > > > >
