From: Andi Kleen <andi@firstfloor.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Suresh Siddha <suresh.b.siddha@intel.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit
Date: Sun, 13 Jul 2008 16:57:50 +0200 [thread overview]
Message-ID: <874p6t25n5.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20080710071640.5035cd70@infradead.org> (Arjan van de Ven's message of "Thu, 10 Jul 2008 07:16:40 -0700")
Arjan van de Ven <arjan@infradead.org> writes:
> On Wed, 9 Jul 2008 20:15:02 -0700
> Yinghai Lu <yhlu.kernel@gmail.com> wrote:
>
>>
>>
>> fix phys_pmd_init to make sure not to return big value than end.
>>
>> also print out range split:1G/2M/4K
>>
>> Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
>
>
> Making an accurate mapping solves a lot of potentially nasty/tricky
> corner cases, so I like the approach
It also means that e.g. on a 1GB system the direct mapping will
never use 1GB pages.
And the CPU has to handle this anyways because all the old
kernels overmap and no x86 CPU can drop support for all old
kernels.
In the end it means only large systems will benefit from 1GB
pages, which seems wrong to me.
-Andi
next prev parent reply other threads:[~2008-07-13 14:58 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-08 8:41 [PATCH] x86: introduce page_size_mask for 64bit Yinghai Lu
2008-07-08 8:43 ` [PATCH] x86: not overmap than end in init_memory_mapping - 64bit Yinghai Lu
2008-07-09 7:38 ` Ingo Molnar
2008-07-09 8:34 ` Ingo Molnar
2008-07-09 8:37 ` Yinghai Lu
2008-07-09 8:46 ` Ingo Molnar
2008-07-09 8:58 ` Yinghai Lu
2008-07-09 10:01 ` Yinghai Lu
2008-07-09 10:30 ` Ingo Molnar
2008-07-09 8:45 ` Ingo Molnar
2008-07-10 3:15 ` [PATCh] x86: overmapped fix when 4K pages on tail " Yinghai Lu
2008-07-10 3:16 ` [PATCH] x86: merge __acpi_map_table Yinghai Lu
2008-07-10 3:17 ` [PATCH] x86: make e820_end return end_of_ram again for 64bit Yinghai Lu
2008-07-10 7:00 ` Ingo Molnar
2008-07-10 11:17 ` [PATCH] x86: e820 remove the range instead of update it to reserved Yinghai Lu
2008-07-11 8:20 ` Ingo Molnar
2008-07-11 3:36 ` [PATCH] x86: save slit Yinghai Lu
2008-07-11 8:22 ` Ingo Molnar
2008-07-11 3:38 ` [PATCH] x86: introduce max_low_pfn_mapped for 64bit Yinghai Lu
2008-07-11 8:26 ` Ingo Molnar
2008-07-11 8:39 ` Yinghai Lu
2008-07-11 8:51 ` Ingo Molnar
2008-07-12 1:41 ` [PATCH] x86: let 32bit use apic_ops too Yinghai Lu
2008-07-12 1:43 ` [PATCH] x86: mach_apicdef.h need to include before smp.h Yinghai Lu
2008-07-12 1:44 ` [PATCH] x86: make read_apic_id return final apicid Yinghai Lu
2008-07-12 8:01 ` [PATCH] x86: make 64bit have get_apic_id Yinghai Lu
2008-07-13 6:28 ` Ingo Molnar
2008-07-13 6:59 ` Ingo Molnar
2008-07-13 7:05 ` Yinghai Lu
2008-07-13 9:23 ` Ingo Molnar
2008-07-13 9:28 ` Ingo Molnar
2008-07-13 16:15 ` Suresh Siddha
2008-07-13 1:19 ` [PATCH] x86: make read_apic_id return final apicid Suresh Siddha
2008-07-13 1:08 ` [PATCH] x86: let 32bit use apic_ops too Suresh Siddha
2008-07-13 2:04 ` Yinghai Lu
2008-07-13 16:28 ` Suresh Siddha
2008-07-13 16:51 ` Maciej W. Rozycki
2008-07-13 17:16 ` Cyrill Gorcunov
2008-07-13 23:46 ` Maciej W. Rozycki
2008-07-14 16:48 ` Cyrill Gorcunov
2008-07-14 17:20 ` Maciej W. Rozycki
2008-07-14 18:09 ` Cyrill Gorcunov
2008-07-14 18:24 ` Maciej W. Rozycki
2008-07-14 18:32 ` Cyrill Gorcunov
2008-07-13 1:43 ` Maciej W. Rozycki
2008-07-13 1:45 ` Yinghai Lu
2008-07-13 1:54 ` Maciej W. Rozycki
2008-07-13 16:43 ` Suresh Siddha
2008-07-13 17:05 ` Maciej W. Rozycki
2008-07-14 5:19 ` [PATCH] x86: let 32bit use apic_ops too - fix Yinghai Lu
2008-07-14 7:12 ` Ingo Molnar
2008-07-14 16:49 ` Suresh Siddha
2008-07-14 17:00 ` Yinghai Lu
2008-07-14 18:03 ` Suresh Siddha
2008-07-18 17:06 ` Ingo Molnar
2008-07-15 17:33 ` Suresh Siddha
2008-07-15 18:10 ` Yinghai Lu
2008-07-15 18:27 ` Suresh Siddha
2008-07-18 17:07 ` Ingo Molnar
2008-07-12 21:30 ` [PATCH] x86: max_low_pfn_mapped fix #1 Yinghai Lu
2008-07-13 9:45 ` Ingo Molnar
2008-07-12 21:31 ` [PATCH] x86: max_low_pfn_mapped fix #2 Yinghai Lu
2008-07-12 21:32 ` [PATCH] x86: max_low_pfn_mapped fix #3 Yinghai Lu
2008-07-13 21:29 ` [PATCH] x86: max_low_pfn_mapped fix #4 Yinghai Lu
2008-07-13 21:30 ` [PATCH] x86: get x86_phys_bits early Yinghai Lu
2008-07-13 21:32 ` [PATCH] x86: make 64bit hpet_set_mapping to use ioremap too Yinghai Lu
2008-07-13 21:50 ` [PATCH] x86: make 64bit hpet_set_mapping to use ioremap too v2 Yinghai Lu
2008-07-10 6:54 ` [PATCH] x86: merge __acpi_map_table Ingo Molnar
2008-07-10 6:53 ` [PATCh] x86: overmapped fix when 4K pages on tail - 64bit Ingo Molnar
2008-07-10 6:57 ` Yinghai Lu
2008-07-10 7:20 ` Ingo Molnar
2008-07-10 7:32 ` Yinghai Lu
2008-07-10 14:16 ` Arjan van de Ven
2008-07-13 14:57 ` Andi Kleen [this message]
2008-07-13 15:33 ` Arjan van de Ven
2008-07-13 18:25 ` Andi Kleen
2008-07-13 18:17 ` Yinghai Lu
2008-07-13 18:48 ` Andi Kleen
2008-07-13 19:00 ` Yinghai Lu
2008-07-13 20:32 ` Ingo Molnar
2008-07-13 20:51 ` Andi Kleen
2008-07-14 0:04 ` H. Peter Anvin
2008-07-14 6:39 ` Andi Kleen
2008-07-09 7:38 ` [PATCH] x86: introduce page_size_mask for 64bit Ingo Molnar
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