[PATCH] kdump documentation update to introduce use of irqpoll
o Specify "irqpoll" command line option which loading second kernel. This helps in reducing driver initialization failures in second kernel due to shared interrupts. o Enabled LAPIC/IOAPIC support for UP kernels in second kernel. This reduces the chances of devices sharing the irq and hence reduces the chances of driver initialization failures in second kernel. o Build a UP capture kernel and disabled SMP support. Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -66,12 +66,18 @@ SETUP
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CONFIG_PHYSICAL_START=0x1000000
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c) Enable "/proc/vmcore support" (Optional, in Pseudo filesystems).
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CONFIG_PROC_VMCORE=y
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d) Disable SMP support and build a UP kernel (Until it is fixed).
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CONFIG_SMP=n
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e) Enable "Local APIC support on uniprocessors".
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CONFIG_X86_UP_APIC=y
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f) Enable "IO-APIC support on uniprocessors"
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CONFIG_X86_UP_IOAPIC=y
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Note: Options a) and b) depend upon "Configure standard kernel features
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(for small systems)" (under General setup).
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Option a) also depends on CONFIG_HIGHMEM (under Processor
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Note: i) Options a) and b) depend upon "Configure standard kernel features
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(for small systems)" (under General setup).
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ii) Option a) also depends on CONFIG_HIGHMEM (under Processor
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type and features).
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Both option a) and b) are under "Processor type and features".
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iii) Both option a) and b) are under "Processor type and features".
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3) Boot into the first kernel. You are now ready to try out kexec-based crash
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dumps.
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@ -79,7 +85,7 @@ SETUP
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4) Load the second kernel to be booted using:
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kexec -p <second-kernel> --crash-dump --args-linux --append="root=<root-dev>
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maxcpus=1 init 1"
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init 1 irqpoll"
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Note: i) <second-kernel> has to be a vmlinux image. bzImage will not work,
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as of now.
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@ -87,12 +93,12 @@ SETUP
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is sufficient to represent the physical memory up to 4GB. To store
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headers in ELF64 format, specifiy "--elf64-core-headers" on the
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kexec command line additionally.
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iii) For now (or until it is fixed), it's best to build the
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second-kernel without multi-processor support, i.e., make it
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a uniprocessor kernel.
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iii) Specify "irqpoll" as command line parameter. This reduces driver
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initialization failures in second kernel due to shared interrupts.
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5) System reboots into the second kernel when a panic occurs. A module can be
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written to force the panic, for testing purposes.
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written to force the panic or "ALT-SysRq-c" can be used initiate a crash
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dump for testing purposes.
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6) Write out the dump file using
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@ -131,5 +137,5 @@ TODO
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CONTACT
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=======
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Hariprasad Nellitheertha - hari at in dot ibm dot com
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Vivek Goyal (vgoyal@in.ibm.com)
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Maneesh Soni (maneesh@in.ibm.com)
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