Re: add new code section for kernel code

["saeed bishara" <saeed.bishara@gmail.com>]

very cooooooooool!!
regarding the readprofile, I think it's recommended to mention that
functions called within spinlocks won't show up.


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
>