> This patch puts the infrastructure in place to allow for a reordering of
> functions based inside the vmlinux.
Can we make this general instead of x86_64 only?
Then we can use Kconfig to enable it for the architectures where we want it.
>
> Index: linux-reorder2/arch/x86_64/Makefile
> ===================================================================
> --- linux-reorder2.orig/arch/x86_64/Makefile
> +++ linux-reorder2/arch/x86_64/Makefile
> @@ -35,6 +35,7 @@ CFLAGS += -m64
> CFLAGS += -mno-red-zone
> CFLAGS += -mcmodel=kernel
> CFLAGS += -pipe
> +CFLAGS += -ffunction-sections
This should go in top-level Makefile
> Index: linux-reorder2/arch/x86_64/kernel/functionlist
> ===================================================================
> --- /dev/null
> +++ linux-reorder2/arch/x86_64/kernel/functionlist
I would have used extension .lds - but no strong feeling for it.
> Index: linux-reorder2/arch/x86_64/kernel/vmlinux.lds.S
> ===================================================================
> --- linux-reorder2.orig/arch/x86_64/kernel/vmlinux.lds.S
> +++ linux-reorder2/arch/x86_64/kernel/vmlinux.lds.S
> @@ -20,7 +20,12 @@ SECTIONS
> phys_startup_64 = startup_64 - LOAD_OFFSET;
> _text = .; /* Text and read-only data */
> .text : AT(ADDR(.text) - LOAD_OFFSET) {
> + /* First the code that has to be first for bootstrapping */
> *(.bootstrap.text)
> + /* Then all the functions that are "hot" in profiles, to group them
> + onto the same hugetlb entry */
> + #include "functionlist"
> + /* Then the rest */
And this part to go into include/asm-generaic/vmlinux.lds.h
> *(.text)
> SCHED_TEXT
> LOCK_TEXT
Sam
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