Messages in this thread Patch in this message | | | Subject | Re: Patch to reorder functions in the vmlinux to a defined order | From | Arjan van de Ven <> | Date | Thu, 23 Feb 2006 17:43:20 +0100 |
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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 ;)
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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