From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] 64K pages on Itanium 1
Date: Thu, 01 Aug 2002 18:17:00 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590701905879@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590701905876@msgid-missing>
>>>>> On Fri, 02 Aug 2002 01:00:42 +1000, Keith Owens <kaos@ocs.com.au> said:
Keith> A recent 2.4.18 ia64 patch removed 64K page support for
Keith> Itanium 1, only allowing it for McKinley. What is the
Keith> restriction on Itanium 1? I have a test case that needs 64K
Keith> pages and I was hoping to run it on Big Sur. The simple test
Keith> of allowing 64K for Itanium 1 breaks as soon as it enters
Keith> user space, during binfmt_elf processing.
The problem is that Itanium 1 has few enough virtual address bits that
with 64KB pages, you end up with an overlap between the user address
space and the virtually mapped linear page table. This can be worked
around (there was a patch from someone at SGI, at some point), but it
wasn't very clean and I didn't think it's worth bothering with it
introduced, given that Itanium 2 solves the problem automagically
(since it supports the full 64 bits of virtual address space).
--david
prev parent reply other threads:[~2002-08-01 18:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-01 15:00 [Linux-ia64] 64K pages on Itanium 1 Keith Owens
2002-08-01 18:17 ` David Mosberger [this message]
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