Re: [PATCH 6/8] IA64 various hugepage size - introduce prctl options to set/get hugepage size

["Helge Deller" <deller@gmx.de>]

Zou Nan hai wrote:
> Introduce 2 prctl option to set/get hugepage size.
> --- a/kernel/sys.c    2006-04-13 08:41:37.000000000 +0800
> +++ b/kernel/sys.c    2006-04-13 08:47:41.000000000 +0800
> +#ifndef GET_HUGEPAGESIZE
> +# define GET_HUGEPAGESIZE(a,b)  (-EINVAL)
> +#endif
> +#ifndef SET_HUGEPAGESIZE
> +# define SET_HUGEPAGESIZE(a,b)  (-EINVAL)
> +#endif
>  
> @@ -2057,6 +2063,12 @@ asmlinkage long sys_prctl(int option, un
>  return -EFAULT;
>  return 0;
>  }
> +             case PR_SET_HUGEPAGE_SIZE:
> +                     error = SET_HUGEPAGESIZE(current, arg2);
> +                     break;
> +             case PR_GET_HUGEPAGE_SIZE:
> +                     error = GET_HUGEPAGESIZE(current, arg2);
> +                     break;
>  default:
>  error = -EINVAL;
>  break;

for architectures which do not support variable hugepage sizes I would 
prefer, that
- prctl(PR_SET_HUGEPAGE_SIZE, DEFAULT_HPAGE_SIZE) returns OK instead of 
FAIL.
- prctl(PR_GET_HUGEPAGE_SIZE) returns the DEFAULT_HPAGE_SIZE  instead of 
FAIL.

Helge

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