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SubjectRe: PATCH 2.4.17.2: make ext2 smaller
Jeff Garzik wrote:
>
> I do not plan to submit this patch to Linus/Marcelo.
>
> This patch applies an obvious technique to the kernel: increase the
> amount of code compiled in a single compilation unit, to increase the
> overall knowledge the compiler has of the code, to allow for better
> optimization and dead code removal. KDE does this, with definite
> success, though they definitely are not the first to do this.
>
> Simply, all ext2 files are #include'd into a single file, ext2_all.c,
> and all functions and data structures are declared static.
>
> This technique can be used in the kernel, userspace applications, and
> userspace libraries to decrease icache footprint and overall size of
> your applications.
>
> Results from 2.4.17-pre2 plus the attached patch: 1135 bytes saved in
> vmlinux, simply from making all the functions static.
> (*.orig is prior to my patch. kernel is P2 SMP-based)
> > [jgarzik@rum linux-e2all]$ ls -l vmlinux* arch/i386/boot/bzImage*
> > -rw-r--r-- 1 jgarzik jgarzik 1030259 Dec 2 06:18 arch/i386/boot/bzImage
> > -rw-r--r-- 1 jgarzik jgarzik 1030263 Dec 2 06:04 arch/i386/boot/bzImage.orig
> > -rwxr-xr-x 1 jgarzik jgarzik 2814631 Dec 2 06:18 vmlinux*
> > -rwxr-xr-x 1 jgarzik jgarzik 2815766 Dec 2 06:04 vmlinux.orig*
r

size vmlinux
and
size vmlinux.orig

would be a bit more telling whatever the reaons of the impact is.
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