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    SubjectRe: Patch to reorder functions in the vmlinux to a defined order
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    On Thu, 2006-02-23 at 17:00 +0100, Andi Kleen wrote:
    > On Thursday 23 February 2006 16:09, Arjan van de Ven wrote:
    >
    > > This patch puts the infrastructure in place to allow for a reordering of
    > > functions based inside the vmlinux. The general idea is that it is possible
    > > to put all "common" functions into the first 2Mb of the code, so that they
    > > are covered by one TLB entry. This as opposed to the current situation where
    > > a typical vmlinux covers about 3.5Mb (on x86-64) and thus 2 TLB entries.
    > > (This patch depends on the previous patch to pin head.S as first in the order)
    >
    > I think you would first need to move the code first for that. Currently it starts
    > at 1MB, which means 1MB is already wasted of the aligned 2MB TLB entry.
    >
    > I wouldn't have a problem with moving the 64bit kernel to 2MB though.

    that was easy since it's a Config entry already ;)


    ---


    As suggested by Andi (and Alan), move the default kernel location
    from 1Mb to 2Mb, to align to the start of a TLB entry.

    Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>

    ---
    arch/x86_64/Kconfig | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    Index: linux-2.6.16-reorder/arch/x86_64/Kconfig
    ===================================================================
    --- linux-2.6.16-reorder.orig/arch/x86_64/Kconfig
    +++ linux-2.6.16-reorder/arch/x86_64/Kconfig
    @@ -444,10 +444,10 @@ config CRASH_DUMP
    config PHYSICAL_START
    hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
    default "0x1000000" if CRASH_DUMP
    - default "0x100000"
    + default "0x200000"
    help
    This gives the physical address where the kernel is loaded. Normally
    - for regular kernels this value is 0x100000 (1MB). But in the case
    + for regular kernels this value is 0x200000 (2MB). But in the case
    of kexec on panic the fail safe kernel needs to run at a different
    address than the panic-ed kernel. This option is used to set the load
    address for kernels used to capture crash dump on being kexec'ed
    -
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