From: David S. Miller [mailto:firstname.lastname@example.org]
Sent: Thursday, August 01, 2002 6:20 PM
Cc: email@example.com; firstname.lastname@example.org;
email@example.com; firstname.lastname@example.org; email@example.com
Subject: Re: large page patch
From: Andrew Morton <firstname.lastname@example.org>
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 :-)
Apparently a page-table based representation could not be used by PPC.
The page-table is just an abstraction, there is no reason dummy
"large" ptes could not be used which are just ignored by the HW TLB
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