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o Kdump documentation update. - Update details for using relocatable kernel. - Start using kexec-tools-testing release as it is latest and old kexec-tools can't load relocatable bzImage file. Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> --- Documentation/kdump/kdump.txt | 160 ++++++++++++++++++++++++++++++++++-------- 1 file changed, 130 insertions(+), 30 deletions(-) diff -puN Documentation/kdump/kdump.txt~kdump-documentation-update Documentation/kdump/kdump.txt --- linux-2.6.20-rc2-mm1-reloc/Documentation/kdump/kdump.txt~kdump-documentation-update 2007-01-08 10:01:50.000000000 +0530 +++ linux-2.6.20-rc2-mm1-reloc-root/Documentation/kdump/kdump.txt 2007-01-08 11:51:49.000000000 +0530 @@ -54,56 +54,68 @@ memory," in two ways: Setup and Installation ====================== -Install kexec-tools and the Kdump patch ---------------------------------------- +Install kexec-tools +------------------- 1) Login as the root user. 2) Download the kexec-tools user-space package from the following URL: - http://www.xmission.com/~ebiederm/files/kexec/kexec-tools-1.101.tar.gz +http://www.kernel.org/pub/linux/kernel/people/horms/kexec-tools/kexec-tools-testing-20061214.tar.gz -3) Unpack the tarball with the tar command, as follows: - - tar xvpzf kexec-tools-1.101.tar.gz - -4) Download the latest consolidated Kdump patch from the following URL: - - http://lse.sourceforge.net/kdump/ +Note: Latest kexec-tools-testing git tree is available at - (This location is being used until all the user-space Kdump patches - are integrated with the kexec-tools package.) +git://git.kernel.org/pub/scm/linux/kernel/git/horms/kexec-tools-testing.git +or +http://www.kernel.org/git/?p=linux/kernel/git/horms/kexec-tools-testing.git;a=summary -5) Change to the kexec-tools-1.101 directory, as follows: +3) Unpack the tarball with the tar command, as follows: - cd kexec-tools-1.101 + tar xvpzf kexec-tools-testing-20061214.tar.gz -6) Apply the ...
I think that the above description is a little misleading, and quite i386 centric. The question is not weather or not you are using the system kernel, but rather, what options are needed for the crash kernel. In terms of a non-relocatable kernel, then the boot and crash kernels need to be separate. But in the case of a relocatable kernel, then the boot and crash kernels may be the same, or they may be separate. Depending on just what the end-user wants in each kernel. On ia64 there is no CONFIG_RELOCATABLE option, but the kernel is always relocatable anyway. That is, you can use the same kernel before and after crash (though I am not sure that I have tested this). I'm not sure about ppc64. I think that the description of how to build the kernels also needs to be reworked a little to reflect this. Perhaps you could divide the methods based on vmlinuz/bzImage, rather than non-relocatable/relocatable (or custom kernel/system kernel?). It seems that it is the former, rather than the later that has impact on how --args-linux is not needed on ia64, but its kernel is relocatable. I think the important point is that if you are using a bzImage, then you need --args-linux, and basically at this point that means an i386 (or x86_64) relocatable bzImage. Then again, I could be wrong, I'm not sure that I understand -- Horms H: http://www.vergenet.net/~horms/ W: http://www.valinux.co.jp/en/ -
Hi Horms, Thanks for going through the update. Actually I never knew that kdump IA64 support is mainline now. I thought it is still in Tony's tree. And we never had IA64 specific documentation in kdump.txt file and that's another reason that discussion became more i386 centric when it came to relocatable I have tried to re-arrange the documentation based on some of your recommendations. I have also left couple of sections empty which are ia64 specific. I don't have an IA64 machine and I don't know how exactly it is used on IA64. Can you please have a quick look at the patch and also fill IA64 specific details where appropriate. Hopefully, this time documentation is clearer. I am hoping it --args-linux will be required while loading vmlinux on IA64? Because this is ELF file specific option. And this interface should Thanks Vivek o Kdump documentation update. - Update details for using relocatable kernel. - Start using kexec-tools-testing release as it is latest and old kexec-tools can't load relocatable bzImage file. - Also add kdump on ia64 specific details. Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> --- Documentation/kdump/kdump.txt | 221 +++++++++++++++++++++++++++++------------- 1 file changed, 153 insertions(+), 68 deletions(-) diff -puN Documentation/kdump/kdump.txt~kdump-documentation-update Documentation/kdump/kdump.txt --- linux-2.6.20-rc2-mm1-reloc/Documentation/kdump/kdump.txt~kdump-documentation-update 2007-01-08 12:32:55.000000000 +0530 +++ linux-2.6.20-rc2-mm1-reloc-root/Documentation/kdump/kdump.txt 2007-01-09 19:57:06.000000000 +0530 @@ -17,7 +17,7 @@ You can use common Linux commands, such memory image to a dump file on the local disk, or across the network to a remote system. -Kdump and kexec are currently supported on the x86, x86_64, and ppc64 +Kdump and kexec are currently supported on the x86, x86_64, ppc64 and IA64 architectures. When the system kernel boots, it reserves a small section of memory for @@ ...
I will take a look into this. -- Horms H: http://www.vergenet.net/~horms/ W: http://www.valinux.co.jp/en/ -
args-linux is not support by IA64 kdump. To have common interface, maybe we should support it by ignore this arg like ppc does. -
That sounds reasonable to me. Vivek, what do you think? -- Horms H: http://www.vergenet.net/~horms/ W: http://www.valinux.co.jp/en/ -
I think we should recognize --args-linux while loading elf image and all the processing we do for loading linux elf vmlinux should be done under that option (The way i386 does). This will help if down the line kexec ia64 loader allows loading some other elf images where one needs to prepare elf boot notes (--args-elf). Eric is the best person to comment on this. He has got all the background about these options. Thanks Vivek -
Vivek, It is not true, kdump on ppc64 works with NUMA and EEH enabled. So the user need not disable NUMA and enable EMBEDDED support to make kdump Should we mention the above paragraph? Why can not we specify by default PPC64 kdump kernel is loaded at 32MB? Regards, Mohan. -
Thanks Mohan. I have updated the document as per your feedback. Please find attached the latest patch. Thanks Vivek o Kdump documentation update. - Update details for using relocatable kernel. - Start using kexec-tools-testing release as it is latest and old kexec-tools can't load relocatable bzImage file. - Also add kdump on ia64 specific details. Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> --- Documentation/kdump/kdump.txt | 224 ++++++++++++++++++++++++++++-------------- 1 file changed, 152 insertions(+), 72 deletions(-) diff -puN Documentation/kdump/kdump.txt~kdump-documentation-update Documentation/kdump/kdump.txt --- linux-2.6.20-rc2-mm1-reloc/Documentation/kdump/kdump.txt~kdump-documentation-update 2007-01-08 12:32:55.000000000 +0530 +++ linux-2.6.20-rc2-mm1-reloc-root/Documentation/kdump/kdump.txt 2007-01-10 14:38:58.000000000 +0530 @@ -17,7 +17,7 @@ You can use common Linux commands, such memory image to a dump file on the local disk, or across the network to a remote system. -Kdump and kexec are currently supported on the x86, x86_64, and ppc64 +Kdump and kexec are currently supported on the x86, x86_64, ppc64 and IA64 architectures. When the system kernel boots, it reserves a small section of memory for @@ -54,59 +54,64 @@ memory," in two ways: Setup and Installation ====================== -Install kexec-tools and the Kdump patch ---------------------------------------- +Install kexec-tools +------------------- 1) Login as the root user. 2) Download the kexec-tools user-space package from the following URL: - http://www.xmission.com/~ebiederm/files/kexec/kexec-tools-1.101.tar.gz +http://www.kernel.org/pub/linux/kernel/people/horms/kexec-tools/kexec-tools-testing-20061214.tar.gz -3) Unpack the tarball with the tar command, as follows: - - tar xvpzf kexec-tools-1.101.tar.gz - -4) Download the latest consolidated Kdump patch from the following URL: - - http://lse.sourceforge.net/kdump/ +Note: Latest ...
This seems like a great improvement on the existing document. Lets get this in the tree and make any further changes from there. I'll send a patch to add the ia64 details shortly. -- Horms H: http://www.vergenet.net/~horms/ W: http://www.valinux.co.jp/en/ -