Re: [patch 14/21] x86: add hugepagesz option on 64-bit

[Randy Dunlap <randy.dunlap@oracle.com>]

On Wed, 04 Jun 2008 21:29:53 +1000 npiggin@suse.de wrote:

> Add an hugepagesz=... option similar to IA64, PPC etc. to x86-64.
> 
> This finally allows to select GB pages for hugetlbfs in x86 now
> that all the infrastructure is in place.
> 
> Signed-off-by: Andi Kleen <ak@suse.de>
> Signed-off-by: Nick Piggin <npiggin@suse.de>
> ---
>  Documentation/kernel-parameters.txt |   11 +++++++++--
>  arch/x86/mm/hugetlbpage.c           |   17 +++++++++++++++++
>  include/asm-x86/page.h              |    2 ++
>  3 files changed, 28 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6/Documentation/kernel-parameters.txt
> ===================================================================
> --- linux-2.6.orig/Documentation/kernel-parameters.txt	2008-06-04 20:47:33.000000000 +1000
> +++ linux-2.6/Documentation/kernel-parameters.txt	2008-06-04 20:51:24.000000000 +1000
> @@ -765,8 +765,15 @@ and is between 256 and 4096 characters. 
>  	hisax=		[HW,ISDN]
>  			See Documentation/isdn/README.HiSax.
>  
> -	hugepages=	[HW,X86-32,IA-64] Maximal number of HugeTLB pages.
> -	hugepagesz=	[HW,IA-64,PPC] The size of the HugeTLB pages.
> +	hugepages=	[HW,X86-32,IA-64] HugeTLB pages to allocate at boot.
> +	hugepagesz=	[HW,IA-64,PPC,X86-64] The size of the HugeTLB pages.
> +			On x86 this option can be specified multiple times

Change this x86 to x86-64 like it is both above and below here?

> +			interleaved with hugepages= to reserve huge pages
> +			of different sizes. Valid pages sizes on x86-64
> +			are 2M (when the CPU supports "pse") and 1G (when the
> +			CPU supports the "pdpe1gb" cpuinfo flag)

			                                   flag).

> +			Note that 1GB pages can only be allocated at boot time
> +			using hugepages= and not freed afterwards.
>  
>  	i8042.direct	[HW] Put keyboard port into non-translated mode
>  	i8042.dumbkbd	[HW] Pretend that controller can only read data from


---
~Randy

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