Messages in this thread | | | Subject | Re: [PATCH 2/4] Core support for --combine -fwhole-program | From | David Woodhouse <> | Date | Fri, 25 Aug 2006 11:40:44 +0100 |
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On Fri, 2006-08-25 at 12:30 +0200, Adrian Bunk wrote: > My hope is "insane" would be something like "1 GB of RAM" that is no > longer insane on current computers. [1]
Maybe -- but still, that's quite a steep requirement, and would also require a fairly major redesign of the current kbuild architecture.
I'm inclined to stick with per-directory builds for now, which is both relatively simple to implement and where the _majority_ of the benefit it likely to be seen.
Whole-kernel optimisation is something I'm inclined to leave until LTO happens -- but don't let me stop you from investigating it.
> > I suspected that most of the 'further savings' to which you refer above > > could be achieved more easily with -ffunction-sections -fdata-sections > > --gc-sections > > AFAIR -ffunction-sections/-fdata-sections cause some overhead in the > resulting binary?
Not that I'm aware of. There's overhead in the resulting ELF files, but we combine sections in the vmlinux.lds so there isn't even that overhead in the vmlinux.
-- dwmw2
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