Re: add new code section for kernel code

[Paolo Ornati]

On Thu, 6 Apr 2006 15:45:47 +0300
"saeed bishara" <saeed.bishara@xxxxxxxxx> 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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