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Re: [PATCH] [4/7] Don't use large pages to map the first 2/4MB of memory

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From: Andi Kleen <andi@...>
To: Thomas Gleixner <tglx@...>
Cc: Andi Kleen <andi@...>, <andreas.herrmann3@...>, <mingo@...>, <linux-kernel@...>
Subject: Re: [PATCH] [4/7] Don't use large pages to map the first 2/4MB of memory
Date: Friday, March 21, 2008 - 2:44 pm

On Fri, Mar 21, 2008 at 07:03:19PM +0100, Thomas Gleixner wrote:

Sure, but it is still not split by default. At least I don't see any code
for that anywhere except in my own patchkit.


Requiring hundreds instead of two TLB entries for the kernel text? 

I must say I personally cannot ever remember any bug caught by RODATA
anyways, so I am a bit dubious on its value.


PCI space is normally in the fourth or sometimes third GB page,
not in the first.  I am not aware of any system that has the PCI hole 
in the first GB.

-Andi

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Messages in current thread:
[PATCH] [1/7] Implement true end_pfn_mapped for 32bit, Andi Kleen, (Tue Mar 11, 10:53 pm)
[PATCH] [7/7] CPA: Add statistics about state of direct mapp..., Andi Kleen, (Tue Mar 11, 10:53 pm)
Re: [PATCH] [7/7] CPA: Add statistics about state of direct ..., Thomas Gleixner, (Fri Mar 21, 1:41 pm)
Re: [PATCH] [7/7] CPA: Add statistics about state of direct ..., Andi Kleen, (Fri Mar 21, 1:55 pm)
[PATCH] CPA: Add statistics about state of direct mapping v3, Andi Kleen, (Sat Mar 22, 5:50 am)
Re: [PATCH] CPA: Add statistics about state of direct mappin..., Thomas Gleixner, (Tue Mar 25, 11:40 am)
Re: [PATCH] CPA: Add statistics about state of direct mappin..., Andi Kleen, (Tue Mar 25, 12:14 pm)
Re: [PATCH] CPA: Add statistics about state of direct mappin..., Thomas Gleixner, (Tue Mar 25, 12:16 pm)
Re: [PATCH] CPA: Add statistics about state of direct mappin..., Andi Kleen, (Tue Mar 25, 1:01 pm)
[PATCH] [6/7] Split large page mapping for AMD TSEG, Andi Kleen, (Tue Mar 11, 10:53 pm)
Re: [PATCH] [6/7] Split large page mapping for AMD TSEG, Thomas Gleixner, (Tue Mar 25, 12:44 pm)
Re: [PATCH] [6/7] Split large page mapping for AMD TSEG, Andi Kleen, (Tue Mar 25, 12:54 pm)
Re: [PATCH] [6/7] Split large page mapping for AMD TSEG, Thomas Gleixner, (Fri Mar 21, 1:55 pm)
Re: [PATCH] [6/7] Split large page mapping for AMD TSEG, Joerg Roedel, (Tue Mar 25, 7:56 am)
[PATCH] [5/7] Readd rdmsrl_safe, Andi Kleen, (Tue Mar 11, 10:53 pm)
Re: [PATCH] [5/7] Readd rdmsrl_safe, Thomas Gleixner, (Fri Mar 21, 1:06 pm)
[PATCH] Readd rdmsrl_safe v2, Andi Kleen, (Sat Mar 22, 5:59 am)
Re: [PATCH] [5/7] Readd rdmsrl_safe, Andi Kleen, (Fri Mar 21, 1:16 pm)
Re: [PATCH] [5/7] Readd rdmsrl_safe, Thomas Gleixner, (Fri Mar 21, 1:58 pm)
Re: [PATCH] [5/7] Readd rdmsrl_safe, Andi Kleen, (Fri Mar 21, 2:06 pm)
Re: [PATCH] [5/7] Readd rdmsrl_safe, Thomas Gleixner, (Fri Mar 21, 2:14 pm)
Re: [PATCH] [5/7] Readd rdmsrl_safe, Andi Kleen, (Fri Mar 21, 2:46 pm)
Re: [PATCH] [5/7] Readd rdmsrl_safe II, Andi Kleen, (Fri Mar 21, 2:48 pm)
[PATCH] [4/7] Don't use large pages to map the first 2/4MB o..., Andi Kleen, (Tue Mar 11, 10:53 pm)
Re: [PATCH] [4/7] Don't use large pages to map the first 2/4..., Thomas Gleixner, (Fri Mar 21, 1:45 pm)
Re: [PATCH] [4/7] Don't use large pages to map the first 2/4..., Andi Kleen, (Fri Mar 21, 1:59 pm)
Re: [PATCH] [4/7] Don't use large pages to map the first 2/4..., Thomas Gleixner, (Fri Mar 21, 2:03 pm)
Re: [PATCH] [4/7] Don't use large pages to map the first 2/4..., Andi Kleen, (Fri Mar 21, 2:44 pm)
Re: [PATCH] [4/7] Don't use large pages to map the first 2/4..., Eric Dumazet, (Wed Mar 12, 1:38 am)
Re: [PATCH] [4/7] Don't use large pages to map the first 2/4..., Andi Kleen, (Wed Mar 12, 5:19 am)
Re: [PATCH] [4/7] Don't use large pages to map the first 2/4..., Joerg Roedel, (Tue Mar 25, 7:31 am)
Re: [PATCH] [4/7] Don't use large pages to map the first 2/4..., Andi Kleen, (Tue Mar 25, 7:39 am)
[PATCH] [3/7] Add set_memory_4k to pageattr.c, Andi Kleen, (Tue Mar 11, 10:53 pm)
[PATCH] [2/7] Account overlapped mappings in end_pfn_map, Andi Kleen, (Tue Mar 11, 10:53 pm)