From: Andrew Morton <akpm@osdl.org>
To: Jay Lan <jlan@sgi.com>
Cc: linux-mm@kvack.org
Subject: Re: [patch] Add support for more than 256 zones
Date: Wed, 13 Aug 2003 13:55:38 -0700 [thread overview]
Message-ID: <20030813135538.19c96c67.akpm@osdl.org> (raw)
In-Reply-To: <3F3A9E46.6010803@sgi.com>
Jay Lan <jlan@sgi.com> wrote:
>
> This patch is to support more than 256 zones for large systems.
> The changes is to add #ifdef CONFIG_IA64 to mm.h to give different
> #define to ZONE_SHIFT.
>
> Thanks,
> - jay lan
>
>
> diff -urN a-2.5.75/include/linux/mm.h b-2.5.75/include/linux/mm.h
> --- a-2.5.75/include/linux/mm.h Thu Jul 10 13:04:45 2003
> +++ b-2.5.75/include/linux/mm.h Tue Aug 12 17:20:22 2003
> @@ -323,7 +323,11 @@
> * sets it, so none of the operations on it need to be atomic.
> */
> #define NODE_SHIFT 4
> +#ifdef CONFIG_IA64
> +#define ZONE_SHIFT (BITS_PER_LONG - 10)
> +#else
> #define ZONE_SHIFT (BITS_PER_LONG - 8)
> +#endif
Yes, this is good - it gives us five more page flags on 32-bit machines.
Assuming that no 32 bit machiens will ever need more than three zones(?)
Please do it this way:
#ifndef ARCH_NR_ZONES_SHIFT
#define ARCH_NR_ZONES_SHIFT 3
#endif
#define ZONE_SHIFT (BITS_PER_LONG - ARCH_NR_ZONES_SHIFT)
and, in asm-ia64/page.h:
#define ARCH_NR_ZONES 10 /* 1024 zones */
--
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next prev parent reply other threads:[~2003-08-13 20:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-13 20:23 Jay Lan
2003-08-13 20:55 ` Andrew Morton [this message]
2003-08-13 21:50 ` Martin J. Bligh
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