From: "David S. Miller" <davem@redhat.com>
To: akpm@zip.com.au
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
rohit.seth@intel.com, sunil.saxena@intel.com,
asit.k.mallick@intel.com
Subject: Re: large page patch
Date: Thu, 01 Aug 2002 18:19:44 -0700 (PDT) [thread overview]
Message-ID: <20020801.181944.09310618.davem@redhat.com> (raw)
In-Reply-To: <3D49DFD0.FE0DBC1D@zip.com.au>
"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
reload code.
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next prev parent reply other threads:[~2002-08-02 1:19 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-02 0:37 Andrew Morton
2002-08-02 0:43 ` David S. Miller
2002-08-02 1:26 ` Andrew Morton
2002-08-02 1:19 ` David S. Miller [this message]
2002-08-02 1:55 ` Rik van Riel
2002-08-02 1:50 ` David S. Miller
2002-08-02 2:29 ` Gerrit Huizenga
2002-08-02 2:23 ` David S. Miller
2002-08-02 2:53 ` Gerrit Huizenga
2002-08-02 5:24 ` David Mosberger
2002-08-02 5:20 ` David S. Miller
2002-08-02 6:26 ` David Mosberger
2002-08-02 6:33 ` Martin J. Bligh
2002-08-02 6:44 ` David Mosberger
2002-08-02 10:00 ` Marcin Dalecki
2002-08-02 7:08 ` Andrew Morton
2002-08-02 7:15 ` William Lee Irwin III
2002-08-02 8:20 ` David S. Miller
2002-08-02 9:05 ` Ryan Cumming
2002-08-02 9:06 ` David S. Miller
2002-08-02 12:52 ` Rik van Riel
2002-08-02 15:27 ` David Mosberger
2002-08-02 1:09 ` Martin J. Bligh
2002-08-02 1:36 ` Andrew Morton
2002-08-02 4:31 ` Daniel Phillips
2002-08-02 4:47 ` Andrew Morton
2002-08-02 3:47 ` William Lee Irwin III
2002-08-02 23:40 ` Chris Wedgwood
2002-08-02 1:34 Seth, Rohit
2002-08-02 19:31 Seth, Rohit
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