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To: linux-kernel@vger.kernel.org
From: torvalds@transmeta.com (Linus Torvalds)
Subject: Re: large page patch
Date: Fri, 2 Aug 2002 03:23:39 +0000 (UTC)
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In article <20020801.181944.09310618.davem@redhat.com>,
David S. Miller <davem@redhat.com> wrote:
>   From: Andrew Morton <akpm@zip.com.au>
>   Date: Thu, 01 Aug 2002 18:26:40 -0700
>
>   "David S. Miller" wrote:
>   > This is probably done to increase the likelyhood that 4MB page orders
>   > are available.  If we collapse 4MB pages deeper, they are less likely
>   > to be broken up because smaller orders would be selected first.
>   
>   This is leakage from ia64, which supports up to 256k pages.
>
>Ummm, 4MB > 256K and even with a 4K PAGE_SIZE MAX_ORDER coalesces
>up to 4MB already :-)

That should be 256_M_ pages (13 bits of page size + 15 bits of MAX_ORDER
gives you 256MB max).

		Linus
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