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SubjectRe: add new code section for kernel code
Hi,
I've tried to port this to my kernel (2.6.12.6), but the kenel
fails to boot; it stops after Starting kernel ....
I tried to add only the CFLAGS += -ffunction-sections to the
arch/arm/Makefile, and it still fails. my tool chains is "gcc version
3.4.4 (release) (CodeSourcery ARM 2005q3-2)"
any ideas?

saeed

On 4/6/06, Paolo Ornati <ornati@fastwebnet.it> wrote:
> On Thu, 6 Apr 2006 15:45:47 +0300
> "saeed bishara" <saeed.bishara@gmail.com> wrote:
>
> > I'm developing linux kernel for ARM cpu with direct-mapped
> > instruction cache, sometimes I notice that the pefromance of the
> > kernel (for some test) is highly dependent on the code layout, in
> > order to fix that I added new code section, and for each kernel
> > function that highly invokerd I added compiler attribute so it will
> > allocated in that section (exactly as the __init section)
>
> It's already done in 2.6.17-rc1 for x86_64:
>
> Processor type and feature --> Function reordering
>
> arch/x86_64/Kconfig:
>
> config REORDER
> bool "Function reordering"
> default n
> help
> This option enables the toolchain to reorder functions for a more
> optimal TLB usage. If you have pretty much any version of binutils,
> this can increase your kernel build time by roughly one minute.
>
> http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4bdc3b7f1b730c07f5a6ccca77ee68e044036ffc
>
> --
> Paolo Ornati
> Linux 2.6.16.1 on x86_64
>
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