Re: ppc64le vmlinuz is huge when building with BTF

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Jiri Olsa wrote on Thu, Jun 15, 2023 at 10:39:18AM +0200:
> > coming from alpine: https://gitlab.alpinelinux.org/alpine/aports/-/issues/12563
> 
> it's probably burried somewhere in that discussion, but do you have
> kernel version (or commit) where that increase happened?

Unfortunately not -- we've just tried on the 6.1.33 that's the current
alpine lts kernel, but I cannot say since when this started because
we've just enabled BTF recently.

Alpine also doesn't seem to keep old versions of apk files on its
mirrors so while it probably has been happening since it got enabled I
don't know how to check, and the commit enabling BTF has been done
without a MR so there's no test log that'd allow seeing the package size
either :/

> also link for used config would be great

alpine has two configs which both exhibit the issue (raw file link on
commit before removing BTF):
https://gitlab.alpinelinux.org/alpine/aports/-/raw/749ee7117e1437b7ab3ef2590f7f2e3558fda3ef/main/linux-lts/virt.ppc64le.config
Size difference for linux-virt: 219 MiB -> 47 MiB
https://gitlab.alpinelinux.org/alpine/aports/-/raw/749ee7117e1437b7ab3ef2590f7f2e3558fda3ef/main/linux-lts/lts.ppc64le.config
Size difference for linux-lts: 306 MiB -> 74 MiB


We just disabled BTF for this arch for now, I honestly won't have time
to dig further short term as I'm not that involved in this issue and
day job is busy right now.

Thanks,
-- 
Dominique




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