Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit

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From: Yinghai Lu

Subject: Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit

Date: Sunday, July 13, 2008 - 11:17 am

On Sun, Jul 13, 2008 at 7:57 AM, Andi Kleen <andi@firstfloor.org> wrote:
quoted text> 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.

with this patch, my 256g system still use gbpages for 1g-3g, 4g-256g

YH
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Messages in current thread:

[PATCH] x86: introduce page_size_mask for 64bit, Yinghai Lu, (Tue Jul 8, 1:41 am)

[PATCH] x86: not overmap than end in init_memory_mapping - ..., Yinghai Lu, (Tue Jul 8, 1:43 am)

Re: [PATCH] x86: introduce page_size_mask for 64bit, Ingo Molnar, (Wed Jul 9, 12:38 am)

Re: [PATCH] x86: not overmap than end in init_memory_mappi ..., Ingo Molnar, (Wed Jul 9, 12:38 am)

Re: [PATCH] x86: not overmap than end in init_memory_mappi ..., Ingo Molnar, (Wed Jul 9, 1:34 am)

Re: [PATCH] x86: not overmap than end in init_memory_mappi ..., Yinghai Lu, (Wed Jul 9, 1:37 am)

Re: [PATCH] x86: not overmap than end in init_memory_mappi ..., Ingo Molnar, (Wed Jul 9, 1:45 am)

Re: [PATCH] x86: not overmap than end in init_memory_mappi ..., Ingo Molnar, (Wed Jul 9, 1:46 am)

Re: [PATCH] x86: not overmap than end in init_memory_mappi ..., Yinghai Lu, (Wed Jul 9, 1:58 am)

Re: [PATCH] x86: not overmap than end in init_memory_mappi ..., Yinghai Lu, (Wed Jul 9, 3:01 am)

Re: [PATCH] x86: not overmap than end in init_memory_mappi ..., Ingo Molnar, (Wed Jul 9, 3:30 am)

[PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Yinghai Lu, (Wed Jul 9, 8:15 pm)

[PATCH] x86: merge __acpi_map_table, Yinghai Lu, (Wed Jul 9, 8:16 pm)

[PATCH] x86: make e820_end return end_of_ram again for 64bit, Yinghai Lu, (Wed Jul 9, 8:17 pm)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Ingo Molnar, (Wed Jul 9, 11:53 pm)

Re: [PATCH] x86: merge __acpi_map_table, Ingo Molnar, (Wed Jul 9, 11:54 pm)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Yinghai Lu, (Wed Jul 9, 11:57 pm)

Re: [PATCH] x86: make e820_end return end_of_ram again for ..., Ingo Molnar, (Thu Jul 10, 12:00 am)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Ingo Molnar, (Thu Jul 10, 12:20 am)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Yinghai Lu, (Thu Jul 10, 12:32 am)

[PATCH] x86: e820 remove the range instead of update it to ..., Yinghai Lu, (Thu Jul 10, 4:17 am)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Arjan van de Ven, (Thu Jul 10, 7:16 am)

[PATCH] x86: save slit, Yinghai Lu, (Thu Jul 10, 8:36 pm)

[PATCH] x86: introduce max_low_pfn_mapped for 64bit, Yinghai Lu, (Thu Jul 10, 8:38 pm)

Re: [PATCH] x86: e820 remove the range instead of update i ..., Ingo Molnar, (Fri Jul 11, 1:20 am)

Re: [PATCH] x86: save slit, Ingo Molnar, (Fri Jul 11, 1:22 am)

Re: [PATCH] x86: introduce max_low_pfn_mapped for 64bit, Ingo Molnar, (Fri Jul 11, 1:26 am)

Re: [PATCH] x86: introduce max_low_pfn_mapped for 64bit, Yinghai Lu, (Fri Jul 11, 1:39 am)

Re: [PATCH] x86: introduce max_low_pfn_mapped for 64bit, Ingo Molnar, (Fri Jul 11, 1:51 am)

[PATCH] x86: let 32bit use apic_ops too, Yinghai Lu, (Fri Jul 11, 6:41 pm)

[PATCH] x86: mach_apicdef.h need to include before smp.h, Yinghai Lu, (Fri Jul 11, 6:43 pm)

[PATCH] x86: make read_apic_id return final apicid, Yinghai Lu, (Fri Jul 11, 6:44 pm)

[PATCH] x86: make 64bit have get_apic_id, Yinghai Lu, (Sat Jul 12, 1:01 am)

[PATCH] x86: max_low_pfn_mapped fix #1, Yinghai Lu, (Sat Jul 12, 2:30 pm)

[PATCH] x86: max_low_pfn_mapped fix #2, Yinghai Lu, (Sat Jul 12, 2:31 pm)

[PATCH] x86: max_low_pfn_mapped fix #3, Yinghai Lu, (Sat Jul 12, 2:32 pm)

Re: [PATCH] x86: let 32bit use apic_ops too, Suresh Siddha, (Sat Jul 12, 6:08 pm)

Re: [PATCH] x86: make read_apic_id return final apicid, Suresh Siddha, (Sat Jul 12, 6:19 pm)

Re: [PATCH] x86: let 32bit use apic_ops too, Maciej W. Rozycki, (Sat Jul 12, 6:43 pm)

Re: [PATCH] x86: let 32bit use apic_ops too, Yinghai Lu, (Sat Jul 12, 6:45 pm)

Re: [PATCH] x86: let 32bit use apic_ops too, Maciej W. Rozycki, (Sat Jul 12, 6:54 pm)

Re: [PATCH] x86: let 32bit use apic_ops too, Yinghai Lu, (Sat Jul 12, 7:04 pm)

Re: [PATCH] x86: make 64bit have get_apic_id, Ingo Molnar, (Sat Jul 12, 11:28 pm)

Re: [PATCH] x86: make 64bit have get_apic_id, Ingo Molnar, (Sat Jul 12, 11:59 pm)

Re: [PATCH] x86: make 64bit have get_apic_id, Yinghai Lu, (Sun Jul 13, 12:05 am)

Re: [PATCH] x86: make 64bit have get_apic_id, Ingo Molnar, (Sun Jul 13, 2:23 am)

Re: [PATCH] x86: make 64bit have get_apic_id, Ingo Molnar, (Sun Jul 13, 2:28 am)

Re: [PATCH] x86: max_low_pfn_mapped fix #1, Ingo Molnar, (Sun Jul 13, 2:45 am)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Andi Kleen, (Sun Jul 13, 7:57 am)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Arjan van de Ven, (Sun Jul 13, 8:33 am)

Re: [PATCH] x86: make 64bit have get_apic_id, Suresh Siddha, (Sun Jul 13, 9:15 am)

Re: [PATCH] x86: let 32bit use apic_ops too, Suresh Siddha, (Sun Jul 13, 9:28 am)

Re: [PATCH] x86: let 32bit use apic_ops too, Suresh Siddha, (Sun Jul 13, 9:43 am)

Re: [PATCH] x86: let 32bit use apic_ops too, Maciej W. Rozycki, (Sun Jul 13, 9:51 am)

Re: [PATCH] x86: let 32bit use apic_ops too, Maciej W. Rozycki, (Sun Jul 13, 10:05 am)

Re: [PATCH] x86: let 32bit use apic_ops too, Cyrill Gorcunov, (Sun Jul 13, 10:16 am)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Yinghai Lu, (Sun Jul 13, 11:17 am)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Andi Kleen, (Sun Jul 13, 11:25 am)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Andi Kleen, (Sun Jul 13, 11:48 am)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Yinghai Lu, (Sun Jul 13, 12:00 pm)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Ingo Molnar, (Sun Jul 13, 1:32 pm)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Andi Kleen, (Sun Jul 13, 1:51 pm)

[PATCH] x86: max_low_pfn_mapped fix #4, Yinghai Lu, (Sun Jul 13, 2:29 pm)

[PATCH] x86: get x86_phys_bits early, Yinghai Lu, (Sun Jul 13, 2:30 pm)

[PATCH] x86: make 64bit hpet_set_mapping to use ioremap too, Yinghai Lu, (Sun Jul 13, 2:32 pm)

[PATCH] x86: make 64bit hpet_set_mapping to use ioremap too v2, Yinghai Lu, (Sun Jul 13, 2:50 pm)

Re: [PATCH] x86: let 32bit use apic_ops too, Maciej W. Rozycki, (Sun Jul 13, 4:46 pm)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, H. Peter Anvin, (Sun Jul 13, 5:04 pm)

[PATCH] x86: let 32bit use apic_ops too - fix, Yinghai Lu, (Sun Jul 13, 10:19 pm)

Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit, Andi Kleen, (Sun Jul 13, 11:39 pm)

Re: [PATCH] x86: let 32bit use apic_ops too - fix, Ingo Molnar, (Mon Jul 14, 12:12 am)

Re: [PATCH] x86: let 32bit use apic_ops too, Cyrill Gorcunov, (Mon Jul 14, 9:48 am)

Re: [PATCH] x86: let 32bit use apic_ops too - fix, Suresh Siddha, (Mon Jul 14, 9:49 am)

Re: [PATCH] x86: let 32bit use apic_ops too - fix, Yinghai Lu, (Mon Jul 14, 10:00 am)

Re: [PATCH] x86: let 32bit use apic_ops too, Maciej W. Rozycki, (Mon Jul 14, 10:20 am)

Re: [PATCH] x86: let 32bit use apic_ops too - fix, Suresh Siddha, (Mon Jul 14, 11:03 am)

Re: [PATCH] x86: let 32bit use apic_ops too, Cyrill Gorcunov, (Mon Jul 14, 11:09 am)

Re: [PATCH] x86: let 32bit use apic_ops too, Maciej W. Rozycki, (Mon Jul 14, 11:24 am)

Re: [PATCH] x86: let 32bit use apic_ops too, Cyrill Gorcunov, (Mon Jul 14, 11:32 am)

Re: [PATCH] x86: let 32bit use apic_ops too - fix, Suresh Siddha, (Tue Jul 15, 10:33 am)

Re: [PATCH] x86: let 32bit use apic_ops too - fix, Yinghai Lu, (Tue Jul 15, 11:10 am)

Re: [PATCH] x86: let 32bit use apic_ops too - fix, Suresh Siddha, (Tue Jul 15, 11:27 am)

Re: [PATCH] x86: let 32bit use apic_ops too - fix, Ingo Molnar, (Fri Jul 18, 10:06 am)

Re: [PATCH] x86: let 32bit use apic_ops too - fix, Ingo Molnar, (Fri Jul 18, 10:07 am)

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