From: Martin Bligh <mbligh@google.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>, Dave Hansen <hansendc@us.ibm.com>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL
Date: Mon, 02 Apr 2007 15:41:43 -0700 [thread overview]
Message-ID: <461186A7.2020803@google.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0704021534100.25602@schroedinger.engr.sgi.com>
Christoph Lameter wrote:
> On Tue, 3 Apr 2007, Andi Kleen wrote:
>
>> If it works I would be inclined to replaced old sparsemem with Christoph's
>> new one on x86-64. Perhaps that could cut down the bewildering sparsemem
>> ifdef jungle that is there currently.
>>
>> But I presume it won't work on 32bit because of the limited address space?
>
> Not in general but it will work in non PAE mode. 4GB need 2^(32-21+4) =
> 16MB pages. This would require the mapping on 4 4MB pages.
IIRC NUMA isn't supported (or useful anyway) without PAE.
> For 64GB you'd need 256M which would be a quarter of low mem. Probably
> takes up too much of low mem.
Yup.
M.
WARNING: multiple messages have this Message-ID (diff)
From: Martin Bligh <mbligh@google.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>, Dave Hansen <hansendc@us.ibm.com>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL
Date: Mon, 02 Apr 2007 15:41:43 -0700 [thread overview]
Message-ID: <461186A7.2020803@google.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0704021534100.25602@schroedinger.engr.sgi.com>
Christoph Lameter wrote:
> On Tue, 3 Apr 2007, Andi Kleen wrote:
>
>> If it works I would be inclined to replaced old sparsemem with Christoph's
>> new one on x86-64. Perhaps that could cut down the bewildering sparsemem
>> ifdef jungle that is there currently.
>>
>> But I presume it won't work on 32bit because of the limited address space?
>
> Not in general but it will work in non PAE mode. 4GB need 2^(32-21+4) =
> 16MB pages. This would require the mapping on 4 4MB pages.
IIRC NUMA isn't supported (or useful anyway) without PAE.
> For 64GB you'd need 256M which would be a quarter of low mem. Probably
> takes up too much of low mem.
Yup.
M.
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next prev parent reply other threads:[~2007-04-02 22:42 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-01 7:10 [PATCH 1/2] Generic Virtual Memmap suport for SPARSEMEM Christoph Lameter
2007-04-01 7:10 ` Christoph Lameter
2007-04-01 7:10 ` [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL Christoph Lameter
2007-04-01 7:10 ` Christoph Lameter
2007-04-01 7:11 ` Christoph Lameter
2007-04-01 7:11 ` Christoph Lameter
2007-04-01 10:46 ` Andi Kleen
2007-04-01 10:46 ` Andi Kleen
2007-04-02 15:37 ` Christoph Lameter
2007-04-02 15:37 ` Christoph Lameter
2007-04-02 15:44 ` Andi Kleen
2007-04-02 15:44 ` Andi Kleen
2007-04-02 15:51 ` Martin J. Bligh
2007-04-02 15:51 ` Martin J. Bligh
2007-04-02 15:54 ` Christoph Lameter
2007-04-02 15:54 ` Christoph Lameter
2007-04-02 17:14 ` Andi Kleen
2007-04-02 17:14 ` Andi Kleen
2007-04-02 17:34 ` Christoph Lameter
2007-04-02 17:34 ` Christoph Lameter
2007-04-02 19:54 ` Dave Hansen
2007-04-02 19:54 ` Dave Hansen
2007-04-02 20:11 ` Christoph Lameter
2007-04-02 20:11 ` Christoph Lameter
2007-04-02 20:13 ` Dave Hansen
2007-04-02 20:13 ` Dave Hansen
2007-04-02 20:30 ` Christoph Lameter
2007-04-02 20:30 ` Christoph Lameter
2007-04-02 20:38 ` Martin Bligh
2007-04-02 20:38 ` Martin Bligh
2007-04-02 20:51 ` Christoph Lameter
2007-04-02 20:51 ` Christoph Lameter
2007-04-05 11:50 ` Andy Whitcroft
2007-04-05 11:50 ` Andy Whitcroft
2007-04-05 18:27 ` Christoph Lameter
2007-04-05 18:27 ` Christoph Lameter
2007-04-07 22:06 ` [PATCH 1/4] x86_64: (SPARSE_VIRTUAL doubles sparsemem speed) Christoph Lameter
2007-04-07 22:06 ` Christoph Lameter
2007-04-07 22:18 ` Andi Kleen
2007-04-07 22:18 ` Andi Kleen
2007-04-09 16:40 ` William Lee Irwin III
2007-04-09 16:40 ` William Lee Irwin III
2007-04-09 17:16 ` Christoph Lameter
2007-04-09 17:16 ` Christoph Lameter
2007-04-09 18:20 ` William Lee Irwin III
2007-04-09 18:20 ` William Lee Irwin III
2007-04-02 21:08 ` [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL Dave Hansen
2007-04-02 21:08 ` Dave Hansen
2007-04-02 21:28 ` Christoph Lameter
2007-04-02 21:28 ` Christoph Lameter
2007-04-02 21:43 ` Martin Bligh
2007-04-02 21:43 ` Martin Bligh
2007-04-02 21:56 ` Dave Hansen
2007-04-02 21:56 ` Dave Hansen
2007-04-02 22:29 ` Christoph Lameter
2007-04-02 22:29 ` Christoph Lameter
2007-04-02 22:31 ` Andi Kleen
2007-04-02 22:31 ` Andi Kleen
2007-04-02 22:37 ` Christoph Lameter
2007-04-02 22:37 ` Christoph Lameter
2007-04-02 22:41 ` Martin Bligh [this message]
2007-04-02 22:41 ` Martin Bligh
2007-04-02 22:49 ` Christoph Lameter
2007-04-02 22:49 ` Christoph Lameter
2007-04-02 22:52 ` Martin Bligh
2007-04-02 22:52 ` Martin Bligh
2007-04-05 12:07 ` Andy Whitcroft
2007-04-05 12:07 ` Andy Whitcroft
2007-04-04 21:27 ` Bob Picco
2007-04-04 21:27 ` Bob Picco
2007-04-04 22:38 ` Christoph Lameter
2007-04-04 22:38 ` Christoph Lameter
2007-04-02 23:03 ` Bjorn Helgaas
2007-04-02 23:03 ` Bjorn Helgaas
2007-04-02 15:44 ` Christoph Lameter
2007-04-02 15:44 ` Christoph Lameter
2007-04-02 16:18 ` Christoph Lameter
2007-04-02 16:18 ` Christoph Lameter
2007-04-02 20:50 ` [PATCH 1/2] Generic Virtual Memmap suport for SPARSEMEM Dave Hansen
2007-04-02 20:50 ` Dave Hansen
2007-04-02 21:00 ` Christoph Lameter
2007-04-02 21:00 ` Christoph Lameter
2007-04-02 21:22 ` Dave Hansen
2007-04-02 21:22 ` Dave Hansen
2007-04-02 21:31 ` Christoph Lameter
2007-04-02 21:31 ` Christoph Lameter
2007-04-02 21:42 ` Dave Hansen
2007-04-02 21:42 ` Dave Hansen
2007-04-02 21:53 ` Christoph Lameter
2007-04-02 21:53 ` Christoph Lameter
2007-04-02 22:05 ` Dave Hansen
2007-04-02 22:05 ` Dave Hansen
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