Linux kernel crash dumps for ARM
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From: Venkappa Mala on 5 Jan 2010 00:00 Hi, With respect to "Linux kernel crash dumps for ARM", i have some doubts which are described as below. If the machine has crashed so badly that you cannot enter commands or the disk is not available then you have three options :- (1) Hand copy the text from the screen (2) capture crash logs using Minicom. (3) save the crash data to a floppy disk or video rom or a swap partition or reserved memory. In the above three options, 1 & 2 are known and works as well. Regarding 3 option, ---------------------------- i would like to support for ARM11. As far as i know, the supported linux kernel crash dumps are "lkcd, netdump,diskdump, mini kernel dump and kdump/kexec". These are supported for x86 and PowerPC architectures with some constrains. i have some queries with respect to ARM supports, these are 1.) kexec is supported in latest kernels example: 2.6.29 kernel File: arch/arm/kernel/machine_kexec.c - is this working well or is there any constraints? 2) As per kexec supports, kexec-tool is required and this allows you to load directly to a new kernel from the currently running one As from my side, i am not able to find arm implementation support in kexec-tools/crash sources. - is kexce-tool supported for ARM or not? 3) In lkcd, netdump,diskdump, mini kernel dump and kdump/kexec tools, - which is the best choice for ARM or are there any best crash dump tool for ARM? Please clarify my queries. Best Regards, Venkappa This Email may contain confidential or privileged information for the intended recipient (s) If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system. ______________________________________________________________________ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Eric W. Biederman on 5 Jan 2010 00:30 Venkappa Mala <Venkappa.Mala(a)lntinfotech.com> writes: I have added the kexec list and corrected the lkml addresses. In principle it should not be too hard to use kexec on panic support on arm. I don't do any arm development so I don't have a clue what the status of the support is on arm. > Hi, > > With respect to "Linux kernel crash dumps for ARM", i have some doubts which are described as below. > > If the machine has crashed so badly that you cannot enter commands or > the disk is not available then you have three options :- > > (1) Hand copy the text from the screen > > (2) capture crash logs using Minicom. > > (3) save the crash data to a floppy disk or video rom or a swap partition or reserved memory. > > In the above three options, 1 & 2 are known and works as well. > > Regarding 3 option, > ---------------------------- > i would like to support for ARM11. > > As far as i know, the supported linux kernel crash dumps are > "lkcd, netdump,diskdump, mini kernel dump and kdump/kexec". > These are supported for x86 and PowerPC architectures with some constrains. > > i have some queries with respect to ARM supports, these are > > 1.) kexec is supported in latest kernels > example: 2.6.29 kernel > File: arch/arm/kernel/machine_kexec.c > > - is this working well or is there any constraints? > > 2) As per kexec supports, kexec-tool is required and this allows you to load directly > to a new kernel from the currently running one > > As from my side, i am not able to find arm implementation support in kexec-tools/crash sources. > > - is kexce-tool supported for ARM or not? > > 3) In lkcd, netdump,diskdump, mini kernel dump and kdump/kexec tools, > > - which is the best choice for ARM or are there any best crash dump tool for ARM? > > Please clarify my queries. > > Best Regards, > Venkappa Eric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Bernhard Walle on 5 Jan 2010 03:40 Am 05.01.2010 06:20, schrieb Eric W. Biederman: >> >> 3) In lkcd, netdump,diskdump, mini kernel dump and kdump/kexec tools, >> >> - which is the best choice for ARM or are there any best crash dump tool for ARM? LKCD is more or less dead (in favour of kdump) on any plattform. It doesn't work with recent kernels. Regards, Bernhard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Paul Mundt on 5 Jan 2010 03:50 On Mon, Jan 04, 2010 at 09:20:23PM -0800, Eric W. Biederman wrote: > Venkappa Mala <Venkappa.Mala(a)lntinfotech.com> writes: > > > > 2) As per kexec supports, kexec-tool is required and this allows you to load directly > > to a new kernel from the currently running one > > > > As from my side, i am not able to find arm implementation support in kexec-tools/crash sources. > > > > - is kexce-tool supported for ARM or not? > > It would be rather counterintuitive for the kernel to support kexec and the necessary userspace components not to. The MAINTAINERS file says: KEXEC M: Eric Biederman <ebiederm(a)xmission.com> W: http://ftp.kernel.org/pub/linux/kernel/people/horms/kexec-tools/ L: kexec(a)lists.infradead.org S: Maintained F: include/linux/kexec.h F: kernel/kexec.c While the above URL redirects to gitweb, resulting in: http://git.kernel.org/?p=linux/kernel/git/horms/kexec-tools.git;a=summary A peripheral grep of the kexec-tools source results in: $ git grep kdump | grep arm kexec/arch/arm/kexec-arm.c: return 0; /* kdump is not supported on this platform (yet) */ So one could infer that kexec is supported on ARM whilst kdump is not. Adding crashdump support requires both some kernel and kexec-tools glue, but is fairly straightforward, just look at the other ports. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Simon Horman on 5 Jan 2010 04:20
On Tue, Jan 05, 2010 at 05:48:51PM +0900, Paul Mundt wrote: > On Mon, Jan 04, 2010 at 09:20:23PM -0800, Eric W. Biederman wrote: > > Venkappa Mala <Venkappa.Mala(a)lntinfotech.com> writes: > > > > > > 2) As per kexec supports, kexec-tool is required and this allows you to load directly > > > to a new kernel from the currently running one > > > > > > As from my side, i am not able to find arm implementation support in kexec-tools/crash sources. > > > > > > - is kexce-tool supported for ARM or not? > > > > It would be rather counterintuitive for the kernel to support kexec and > the necessary userspace components not to. > > The MAINTAINERS file says: > > KEXEC > M: Eric Biederman <ebiederm(a)xmission.com> > W: http://ftp.kernel.org/pub/linux/kernel/people/horms/kexec-tools/ > L: kexec(a)lists.infradead.org > S: Maintained > F: include/linux/kexec.h > F: kernel/kexec.c > > While the above URL redirects to gitweb, resulting in: > > http://git.kernel.org/?p=linux/kernel/git/horms/kexec-tools.git;a=summary > > A peripheral grep of the kexec-tools source results in: > > $ git grep kdump | grep arm > kexec/arch/arm/kexec-arm.c: return 0; /* kdump is not supported on this platform (yet) */ > > So one could infer that kexec is supported on ARM whilst kdump is not. > Adding crashdump support requires both some kernel and kexec-tools glue, > but is fairly straightforward, just look at the other ports. To add to this, my understanding is that kexec support varies across different ARM platforms - that is to say, it works on some and fails on others. While this seems to be slowly improving, I'm also aware of any list of what is supported and what isn't. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |