On Wed, Apr 3, 2024 at 10:06 AM Vincent Li <vincent.mc.li@xxxxxxxxx> wrote: > > Hi, > > Once I enabled the open source firewall IPfire kernel 6.6.15 > DEBUG_INFO_BTF, the IPfire ISO image is increased from about 450MB to > about 1.5GB, I suspect because IPfire has many driver modules to BTF can't be that big. I think you just get all the DWARF for modules and vmlinux itself. DWARF is necessary to generate BTF during the build time, but it can be stripped out afterwards, leaving just (much smaller) BTF intact. > support as many hardware as possible, pahole generated BTF for all > these modules, that could increase the size of the ISO image, so I > wonder if I could disable modules BTF only but keep vmlinux BTF, or > maybe selectively enable BTF for some modules, but not other modules? > > I found this discussion [0] making DEBUG_INFO_BTF_MODULES selectable > independently. I am still not sure how to disable modules BTF, I tried > make menuconfig, still not obvious to me how to disable > DEBUG_INFO_BTF_MODULES I think CONFIG_DEBUG_INFO_BTF_MODULES=n should work fine, but see above, I don't think the BTF is a problem here, it's not stripping out DWARF. > > [0] https://lore.kernel.org/bpf/CAKH8qBu0ptKbMVvoMpgN2tyk84ZGvwuCJLjesqw-_8QtSRLqpw@xxxxxxxxxxxxxx/T/#m73cee268387358ec645b665951feb931b294ec2d > > Thanks! >
