Can't exclude unnecessary pages for 2.6.31 Kernel
CAI Qian
caiqian at redhat.com
Fri Oct 2 07:26:44 EDT 2009
Cced the crash utility maintainer.
BZ filed -- https://bugzilla.redhat.com/show_bug.cgi?id=526749
> It does make -d 16 works without errors. However, the crash utility
> failed to read it (the log attached), but the full VMCore is working
> fine there.
>
> crash: page excluded: kernel virtual address: ffffffff819f1764 type:
> "tss_struct ist array"
Thanks!
CAI Qian
From: "Ken'ichi Ohmichi" <oomichi at mxs.nes.nec.co.jp>
Subject: Re: Can't exclude unnecessary pages for 2.6.31 Kernel
Date: Fri, 02 Oct 2009 09:16:50 +0900
>
> Hi CAI,
>
> Thank you for testing and your report.
>
> CAI Qian wrote:
>> Met 2 issues with 2.6.31 kernel.
>>
>> (1) makedumpfile needs to be updated to support 2.6.31 kernel. This looks like
>> an easy fix. In makedumpfile.h,
>>
>> #define LATEST_VERSION (0x0206001d) /* linux-2.6.29 */
>
> The next makedumpfile will support 2.6.31 kernel, and the above will be fixed.
>
>
>> (2) makedumpfile -d 16 failed.
>>
>> # makedumpfile -D -d 16
>> /var/crash/127.0.0.1-2009-10-01-06\:22\:33/vmcore vmcore
>>
>> LOAD (0)
>> phys_start : 1000000
>> phys_end : 2683000
>> virt_start : ffffffff81000000
>> virt_end : ffffffff82683000
>> LOAD (1)
>> phys_start : 0
>> phys_end : a0000
>> virt_start : ffff810000000000
>> virt_end : ffff8100000a0000
>> LOAD (2)
>> phys_start : 100000
>> phys_end : 3000000
>> virt_start : ffff810000100000
>> virt_end : ffff810003000000
>> LOAD (3)
>> phys_start : b000000
>> phys_end : 3ff70000
>> virt_start : ffff81000b000000
>> virt_end : ffff81003ff70000
>> Linux kdump
>> page_size : 4096
>>
>> max_mapnr : 3ff70
>> The kernel version is not supported.
>> The created dumpfile may be incomplete.
>>
>> num of NODEs : 1
>>
>>
>> Memory type : SPARSEMEM
>>
>> mem_map (0)
>> mem_map : ffff880002664000
>> pfn_start : 0
>> pfn_end : 8000
>> mem_map (1)
>> mem_map : 0
>> pfn_start : 8000
>> pfn_end : 10000
>> mem_map (2)
>> mem_map : 0
>> pfn_start : 10000
>> pfn_end : 18000
>> mem_map (3)
>> mem_map : 0
>> pfn_start : 18000
>> pfn_end : 20000
>> mem_map (4)
>> mem_map : 0
>> pfn_start : 20000
>> pfn_end : 28000
>> mem_map (5)
>> mem_map : 0
>> pfn_start : 28000
>> pfn_end : 30000
>> mem_map (6)
>> mem_map : 0
>> pfn_start : 30000
>> pfn_end : 38000
>> mem_map (7)
>> mem_map : 0
>> pfn_start : 38000
>> pfn_end : 3ff70
>> Excluding unnecessary pages : [100 %] page_to_pfn: Can't convert
>> the address of page descriptor (ffffea000004e000) to pfn.
>>
>> create_2nd_bitmap: Can't exclude unnecessary pages.
>>
>> makedumpfile Failed.
>
> The cause is that the virtual memory map of x86_64 has been changed to
> the following since linux-2.6.31.
>
> 15250 --- a/Documentation/x86/x86_64/mm.txt
> 15251 +++ b/Documentation/x86/x86_64/mm.txt
> 15252 @@ -6,10 +6,11 @@ Virtual memory map with 4 level page tables:
> 15253 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm
> 15254 hole caused by [48:63] sign extension
> 15255 ffff800000000000 - ffff80ffffffffff (=40 bits) guard hole
> 15256 -ffff880000000000 - ffffc0ffffffffff (=57 TB) direct mapping of all phys. memory
> 15257 -ffffc10000000000 - ffffc1ffffffffff (=40 bits) hole
> 15258 -ffffc20000000000 - ffffe1ffffffffff (=45 bits) vmalloc/ioremap space
> 15259 -ffffe20000000000 - ffffe2ffffffffff (=40 bits) virtual memory map (1TB)
> 15260 +ffff880000000000 - ffffc7ffffffffff (=64 TB) direct mapping of all phys. memory
> 15261 +ffffc80000000000 - ffffc8ffffffffff (=40 bits) hole
> 15262 +ffffc90000000000 - ffffe8ffffffffff (=45 bits) vmalloc/ioremap space
> 15263 +ffffe90000000000 - ffffe9ffffffffff (=40 bits) hole
> 15264 +ffffea0000000000 - ffffeaffffffffff (=40 bits) virtual memory map (1TB)
>
> I created the patch for catching this change.
> Could you try the attached patch ?
>
>
> Thanks
> Ken'ichi Ohmichi
>
> ---
> [PATCH] Add x86_64 linux-2.6.31 support.
>
> Virtual memory map of x86_64 has been changed to the following
> since linux-2.6.31.
>
> 15250 --- a/Documentation/x86/x86_64/mm.txt
> 15251 +++ b/Documentation/x86/x86_64/mm.txt
> 15252 @@ -6,10 +6,11 @@ Virtual memory map with 4 level page tables:
> 15253 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm
> 15254 hole caused by [48:63] sign extension
> 15255 ffff800000000000 - ffff80ffffffffff (=40 bits) guard hole
> 15256 -ffff880000000000 - ffffc0ffffffffff (=57 TB) direct mapping of all phys. memory
> 15257 -ffffc10000000000 - ffffc1ffffffffff (=40 bits) hole
> 15258 -ffffc20000000000 - ffffe1ffffffffff (=45 bits) vmalloc/ioremap space
> 15259 -ffffe20000000000 - ffffe2ffffffffff (=40 bits) virtual memory map (1TB)
> 15260 +ffff880000000000 - ffffc7ffffffffff (=64 TB) direct mapping of all phys. memory
> 15261 +ffffc80000000000 - ffffc8ffffffffff (=40 bits) hole
> 15262 +ffffc90000000000 - ffffe8ffffffffff (=45 bits) vmalloc/ioremap space
> 15263 +ffffe90000000000 - ffffe9ffffffffff (=40 bits) hole
> 15264 +ffffea0000000000 - ffffeaffffffffff (=40 bits) virtual memory map (1TB)
>
> This patch catches up this change.
>
>
> Signed-off-by: Ken'ichi Ohmichi <oomichi at mxs.nes.nec.co.jp>
> ---
> diff -rpuN a/makedumpfile.h b/makedumpfile.h
> --- a/makedumpfile.h 2009-04-20 15:26:23.000000000 +0900
> +++ b/makedumpfile.h 2009-10-02 09:44:44.000000000 +0900
> @@ -450,6 +450,7 @@ do { \
> #define LATEST_VERSION (0x0206001d) /* linux-2.6.29 */
> #define VERSION_LINUX_2_6_26 (0x0206001a) /* linux-2.6.26 */
> #define VERSION_LINUX_2_6_27 (0x0206001b) /* linux-2.6.27 */
> +#define VERSION_LINUX_2_6_31 (0x0206001f) /* linux-2.6.31 */
>
> /*
> * vmcoreinfo in /proc/vmcore
> @@ -502,6 +503,10 @@ do { \
> * The value of dependence on machine
> */
> #define PAGE_OFFSET (info->page_offset)
> +#define VMALLOC_START (info->vmalloc_start)
> +#define VMALLOC_END (info->vmalloc_end)
> +#define VMEMMAP_START (info->vmemmap_start)
> +#define VMEMMAP_END (info->vmemmap_end)
>
> #ifdef __x86__
> #define __PAGE_OFFSET (0xc0000000)
> @@ -535,12 +540,18 @@ do { \
> #endif /* x86 */
>
> #ifdef __x86_64__
> -#define __PAGE_OFFSET_ORIG (0xffff810000000000) /* linux-2.6.26, or former */
> -#define __PAGE_OFFSET_2_6_27 (0xffff880000000000) /* linux-2.6.27, or later */
> -#define VMALLOC_START (0xffffc20000000000)
> -#define VMALLOC_END (0xffffe1ffffffffff)
> -#define VMEMMAP_START (0xffffe20000000000)
> -#define VMEMMAP_END (0xffffe2ffffffffff)
> +#define __PAGE_OFFSET_ORIG (0xffff810000000000) /* 2.6.26, or former */
> +#define __PAGE_OFFSET_2_6_27 (0xffff880000000000) /* 2.6.27, or later */
> +
> +#define VMALLOC_START_ORIG (0xffffc20000000000) /* 2.6.30, or former */
> +#define VMALLOC_START_2_6_31 (0xffffc90000000000) /* 2.6.31, or later */
> +#define VMALLOC_END_ORIG (0xffffe1ffffffffff) /* 2.6.30, or former */
> +#define VMALLOC_END_2_6_31 (0xffffe8ffffffffff) /* 2.6.31, or later */
> +
> +#define VMEMMAP_START_ORIG (0xffffe20000000000) /* 2.6.30, or former */
> +#define VMEMMAP_START_2_6_31 (0xffffea0000000000) /* 2.6.31, or later */
> +#define VMEMMAP_END_ORIG (0xffffe2ffffffffff) /* 2.6.30, or former */
> +#define VMEMMAP_END_2_6_31 (0xffffeaffffffffff) /* 2.6.31, or later */
>
> #define __START_KERNEL_map (0xffffffff80000000)
> #define MODULES_VADDR (0xffffffff88000000)
> @@ -549,6 +560,7 @@ do { \
> #define _SECTION_SIZE_BITS (27)
> #define _MAX_PHYSMEM_BITS_ORIG (40)
> #define _MAX_PHYSMEM_BITS_2_6_26 (44)
> +#define _MAX_PHYSMEM_BITS_2_6_31 (46)
>
> /*
> * 4 Levels paging
> @@ -786,6 +798,9 @@ struct DumpInfo {
> unsigned long phys_base;
> unsigned long kernel_start;
> unsigned long vmalloc_start;
> + unsigned long vmalloc_end;
> + unsigned long vmemmap_start;
> + unsigned long vmemmap_end;
>
> /*
> * diskdimp info:
> diff -rpuN a/x86_64.c b/x86_64.c
> --- a/x86_64.c 2008-10-10 10:13:19.000000000 +0900
> +++ b/x86_64.c 2009-10-02 09:45:39.000000000 +0900
> @@ -70,14 +70,28 @@ get_versiondep_info_x86_64(void)
> */
> if (info->kernel_version < VERSION_LINUX_2_6_26)
> info->max_physmem_bits = _MAX_PHYSMEM_BITS_ORIG;
> - else
> + else if (info->kernel_version < VERSION_LINUX_2_6_31)
> info->max_physmem_bits = _MAX_PHYSMEM_BITS_2_6_26;
> + else
> + info->max_physmem_bits = _MAX_PHYSMEM_BITS_2_6_31;
>
> if (info->kernel_version < VERSION_LINUX_2_6_27)
> info->page_offset = __PAGE_OFFSET_ORIG;
> else
> info->page_offset = __PAGE_OFFSET_2_6_27;
>
> + if (info->kernel_version < VERSION_LINUX_2_6_31) {
> + info->vmalloc_start = VMALLOC_START_ORIG;
> + info->vmalloc_end = VMALLOC_END_ORIG;
> + info->vmemmap_start = VMEMMAP_START_ORIG;
> + info->vmemmap_end = VMEMMAP_END_ORIG;
> + } else {
> + info->vmalloc_start = VMALLOC_START_2_6_31;
> + info->vmalloc_end = VMALLOC_END_2_6_31;
> + info->vmemmap_start = VMEMMAP_START_2_6_31;
> + info->vmemmap_end = VMEMMAP_END_2_6_31;
> + }
> +
> return TRUE;
> }
>
>
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