From: ebiederm@xmission.com (Eric W. Biederman)
To: Christoph Lameter <cl@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Mike Travis <travis@sgi.com>,
Jeremy Fitzhardinge <jeremy@goop.org>,
Arjan van de Ven <arjan@infradead.org>,
Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Jack Steiner <steiner@sgi.com>,
linux-kernel@vger.kernel.org,
Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses
Date: Thu, 10 Jul 2008 14:26:17 -0700 [thread overview]
Message-ID: <m1hcaxo2h2.fsf@frodo.ebiederm.org> (raw)
In-Reply-To: <48767A28.7070900@linux-foundation.org> (Christoph Lameter's message of "Thu, 10 Jul 2008 16:07:52 -0500")
Christoph Lameter <cl@linux-foundation.org> writes:
> H. Peter Anvin wrote:
>
>> And how much is that, especially on *small* systems?
>
> i386?
>
> i386 uses 4K mappings. There are just a few cpus supported, there is scarcity of
> ZONE_NORMAL memory so the per cpu areas really cannot get that big. See the
> cpu_alloc patchsets for i386.
i386 is fundamentally resource constrained. However x86_32 should support a
strict superset of the machines the x86_64 kernel supports.
Because it is resource constrained in the lowmem zone you should not
be able to bring up all of the cpus on a huge cpu box. But you should still
be able to boot and run the kernel. So for percpu data we have effectively
same size constraints.
Eric
next prev parent reply other threads:[~2008-07-10 21:32 UTC|newest]
Thread overview: 190+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-09 16:51 [RFC 00/15] x86_64: Optimize percpu accesses Mike Travis
2008-07-09 16:51 ` [RFC 01/15] x86_64: Cleanup early setup_percpu references Mike Travis
2008-07-09 16:51 ` [RFC 02/15] x86_64: Fold pda into per cpu area Mike Travis
2008-07-09 22:02 ` Eric W. Biederman
2008-07-13 17:54 ` Ingo Molnar
2008-07-14 14:24 ` Mike Travis
2008-07-09 16:51 ` [RFC 03/15] x86_64: Reference zero-based percpu variables offset from gs Mike Travis
2008-07-09 16:51 ` [RFC 04/15] x86_64: Replace cpu_pda ops with percpu ops Mike Travis
2008-07-09 16:51 ` [RFC 05/15] x86_64: Replace xxx_pda() operations with x86_xxx_percpu() Mike Travis
2008-07-09 16:51 ` [RFC 06/15] x86_64: Replace xxx_pda() operations in include_asm-x86_current_h Mike Travis
2008-07-09 16:51 ` [RFC 07/15] x86_64: Replace xxx_pda() operations in include_asm-x86_hardirq_64_h Mike Travis
2008-07-09 16:51 ` [RFC 08/15] x86_64: Replace xxx_pda() operations in include_asm-x86_mmu_context_64_h Mike Travis
2008-07-09 16:51 ` [RFC 09/15] x86_64: Replace xxx_pda() operations in include_asm-x86_percpu_h Mike Travis
2008-07-09 16:51 ` [RFC 10/15] x86_64: Replace xxx_pda() operations in include_asm-x86_smp_h Mike Travis
2008-07-09 16:51 ` [RFC 11/15] x86_64: Replace xxx_pda() operations in include_asm-x86_stackprotector_h Mike Travis
2008-07-09 16:51 ` [RFC 12/15] x86_64: Replace xxx_pda() operations in include_asm-x86_thread_info_h Mike Travis
2008-07-09 16:51 ` [RFC 13/15] x86_64: Replace xxx_pda() operations in include_asm-x86_topology_h Mike Travis
2008-07-09 16:51 ` [RFC 14/15] x86_64: Remove xxx_pda() operations Mike Travis
2008-07-09 16:51 ` [RFC 15/15] x86_64: Remove cpu_pda() macro Mike Travis
2008-07-09 17:19 ` [RFC 00/15] x86_64: Optimize percpu accesses H. Peter Anvin
2008-07-09 17:40 ` Mike Travis
2008-07-09 17:42 ` H. Peter Anvin
2008-07-09 18:05 ` Mike Travis
2008-07-09 17:44 ` Jeremy Fitzhardinge
2008-07-09 18:09 ` Mike Travis
2008-07-09 18:30 ` H. Peter Anvin
2008-07-09 19:34 ` Ingo Molnar
2008-07-09 19:44 ` H. Peter Anvin
2008-07-09 20:26 ` Adrian Bunk
2008-07-09 21:03 ` Mike Travis
2008-07-09 21:23 ` Jeremy Fitzhardinge
2008-07-25 15:49 ` Mike Travis
2008-07-25 16:08 ` Jeremy Fitzhardinge
2008-07-25 16:46 ` Mike Travis
2008-07-25 16:58 ` Jeremy Fitzhardinge
2008-07-25 18:12 ` Mike Travis
2008-07-09 17:27 ` Jeremy Fitzhardinge
2008-07-09 17:39 ` Christoph Lameter
2008-07-09 17:51 ` Jeremy Fitzhardinge
2008-07-09 18:14 ` Mike Travis
2008-07-09 18:22 ` Jeremy Fitzhardinge
2008-07-09 18:31 ` Mike Travis
2008-07-09 19:08 ` Jeremy Fitzhardinge
2008-07-09 18:02 ` Mike Travis
2008-07-09 18:13 ` Christoph Lameter
2008-07-09 18:26 ` Jeremy Fitzhardinge
2008-07-09 18:34 ` Christoph Lameter
2008-07-09 18:37 ` H. Peter Anvin
2008-07-09 18:48 ` Jeremy Fitzhardinge
2008-07-09 18:53 ` Christoph Lameter
2008-07-09 19:07 ` Jeremy Fitzhardinge
2008-07-09 19:12 ` Christoph Lameter
2008-07-09 19:32 ` Jeremy Fitzhardinge
2008-07-09 19:41 ` Ingo Molnar
2008-07-09 19:45 ` H. Peter Anvin
2008-07-09 19:52 ` Christoph Lameter
2008-07-09 20:00 ` Ingo Molnar
2008-07-09 20:09 ` Jeremy Fitzhardinge
2008-07-09 21:05 ` Mike Travis
2008-07-09 19:44 ` Christoph Lameter
2008-07-09 19:48 ` Jeremy Fitzhardinge
2008-07-09 18:27 ` Mike Travis
2008-07-09 18:46 ` Jeremy Fitzhardinge
2008-07-09 20:22 ` Eric W. Biederman
2008-07-09 20:35 ` Jeremy Fitzhardinge
2008-07-09 20:53 ` Eric W. Biederman
2008-07-09 21:03 ` Ingo Molnar
2008-07-09 21:16 ` H. Peter Anvin
2008-07-09 21:10 ` Arjan van de Ven
2008-07-09 23:20 ` Eric W. Biederman
2008-07-09 18:31 ` H. Peter Anvin
2008-07-09 18:00 ` Mike Travis
2008-07-09 19:05 ` Jeremy Fitzhardinge
2008-07-09 19:28 ` Ingo Molnar
2008-07-09 20:55 ` Mike Travis
2008-07-09 21:12 ` Ingo Molnar
2008-07-09 20:00 ` Eric W. Biederman
2008-07-09 20:05 ` Jeremy Fitzhardinge
2008-07-09 20:15 ` Ingo Molnar
2008-07-09 20:07 ` Ingo Molnar
2008-07-09 20:11 ` Jeremy Fitzhardinge
2008-07-09 20:18 ` Christoph Lameter
2008-07-09 20:33 ` Jeremy Fitzhardinge
2008-07-09 20:42 ` H. Peter Anvin
2008-07-09 20:48 ` Jeremy Fitzhardinge
2008-07-09 21:06 ` Eric W. Biederman
2008-07-09 21:16 ` H. Peter Anvin
2008-07-09 21:20 ` Jeremy Fitzhardinge
2008-07-09 21:25 ` Christoph Lameter
2008-07-09 21:36 ` H. Peter Anvin
2008-07-09 21:41 ` Jeremy Fitzhardinge
2008-07-09 22:22 ` Eric W. Biederman
2008-07-09 22:32 ` Jeremy Fitzhardinge
2008-07-09 23:36 ` Eric W. Biederman
2008-07-10 0:19 ` H. Peter Anvin
2008-07-10 0:24 ` Jeremy Fitzhardinge
2008-07-10 14:14 ` Christoph Lameter
2008-07-10 14:26 ` H. Peter Anvin
2008-07-10 15:26 ` Christoph Lameter
2008-07-10 15:42 ` H. Peter Anvin
2008-07-10 16:24 ` Christoph Lameter
2008-07-10 16:33 ` H. Peter Anvin
2008-07-10 16:45 ` Christoph Lameter
2008-07-10 17:33 ` Jeremy Fitzhardinge
2008-07-10 17:42 ` Christoph Lameter
2008-07-10 17:53 ` Jeremy Fitzhardinge
2008-07-10 17:55 ` H. Peter Anvin
2008-07-10 20:52 ` Christoph Lameter
2008-07-10 20:58 ` Jeremy Fitzhardinge
2008-07-10 21:03 ` H. Peter Anvin
2008-07-11 0:55 ` Mike Travis
2008-07-10 21:05 ` Christoph Lameter
2008-07-10 21:22 ` Eric W. Biederman
2008-07-10 21:29 ` H. Peter Anvin
2008-07-11 0:12 ` Mike Travis
2008-07-11 0:14 ` H. Peter Anvin
2008-07-11 0:58 ` Mike Travis
2008-07-11 1:41 ` H. Peter Anvin
2008-07-11 15:37 ` Christoph Lameter
2008-07-11 0:42 ` Eric W. Biederman
2008-07-11 15:36 ` Christoph Lameter
2008-07-10 17:53 ` H. Peter Anvin
2008-07-10 17:26 ` Eric W. Biederman
2008-07-10 17:38 ` Christoph Lameter
2008-07-10 19:11 ` Mike Travis
2008-07-10 19:12 ` Eric W. Biederman
2008-07-10 17:46 ` Mike Travis
2008-07-10 17:51 ` H. Peter Anvin
2008-07-10 19:09 ` Eric W. Biederman
2008-07-10 19:18 ` Mike Travis
2008-07-10 19:32 ` H. Peter Anvin
2008-07-10 23:37 ` Mike Travis
2008-07-10 20:17 ` Eric W. Biederman
2008-07-10 20:24 ` Ingo Molnar
2008-07-10 21:33 ` Eric W. Biederman
2008-07-11 1:39 ` Mike Travis
2008-07-11 2:57 ` Eric W. Biederman
2008-07-10 0:23 ` Jeremy Fitzhardinge
2008-07-09 20:35 ` H. Peter Anvin
2008-07-09 20:39 ` Arjan van de Ven
2008-07-09 20:44 ` H. Peter Anvin
2008-07-09 20:50 ` Jeremy Fitzhardinge
2008-07-09 21:12 ` H. Peter Anvin
2008-07-09 21:26 ` Jeremy Fitzhardinge
2008-07-09 21:37 ` H. Peter Anvin
2008-07-09 22:10 ` Eric W. Biederman
2008-07-09 22:23 ` H. Peter Anvin
2008-07-09 23:54 ` Eric W. Biederman
2008-07-10 16:22 ` Mike Travis
2008-07-10 16:25 ` H. Peter Anvin
2008-07-10 16:35 ` Christoph Lameter
2008-07-10 16:39 ` H. Peter Anvin
2008-07-10 16:47 ` Christoph Lameter
2008-07-10 17:21 ` Jeremy Fitzhardinge
2008-07-10 17:31 ` Christoph Lameter
2008-07-10 17:48 ` Jeremy Fitzhardinge
2008-07-10 18:00 ` H. Peter Anvin
2008-07-10 17:20 ` Mike Travis
2008-07-10 17:07 ` Jeremy Fitzhardinge
2008-07-10 17:12 ` Christoph Lameter
2008-07-10 17:25 ` Jeremy Fitzhardinge
2008-07-10 17:34 ` Christoph Lameter
2008-07-10 17:41 ` Mike Travis
2008-07-10 18:01 ` H. Peter Anvin
2008-07-10 20:51 ` Christoph Lameter
2008-07-10 20:58 ` H. Peter Anvin
2008-07-10 21:07 ` Christoph Lameter
2008-07-10 21:11 ` H. Peter Anvin
2008-07-11 15:32 ` Christoph Lameter
2008-07-11 16:07 ` H. Peter Anvin
2008-07-11 16:57 ` Eric W. Biederman
2008-07-11 17:10 ` H. Peter Anvin
2008-07-10 21:26 ` Eric W. Biederman [this message]
2008-07-10 18:48 ` Eric W. Biederman
2008-07-10 18:54 ` Jeremy Fitzhardinge
2008-07-10 19:18 ` Eric W. Biederman
2008-07-10 19:56 ` Jeremy Fitzhardinge
2008-07-10 20:22 ` Eric W. Biederman
2008-07-10 20:54 ` Jeremy Fitzhardinge
2008-07-11 6:59 ` Rusty Russell
2008-07-10 20:25 ` Eric W. Biederman
2008-07-10 17:57 ` H. Peter Anvin
2008-07-10 18:08 ` H. Peter Anvin
2008-07-09 20:46 ` Jeremy Fitzhardinge
2008-07-09 20:14 ` Arjan van de Ven
2008-07-09 20:33 ` Eric W. Biederman
2008-07-09 21:01 ` Ingo Molnar
2008-07-09 21:39 ` Mike Travis
2008-07-09 21:47 ` Jeremy Fitzhardinge
2008-07-09 21:55 ` Eric W. Biederman
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