Hi, Vivek.
I applied all your patches to linux 2.6.16-mm1, and did kdump on my i386
machine with 8GB memory. But the problem that vmcore is truncated and
limited to 4GB wasn't solved.
Are there a command option etc. that should be specified?
arch : i386 smp
kernel : 2.6.16-mm1 + Viveck's patch(2006/03/23 64bit resources)
memory : 8GB
kexec-tools: 1.01 + kdump7.patch
The operation log is as follows.
--------------------------------------------------
# uname -r
2.6.16-mm1-kdump.smp
# free
total used free shared buffers cached
Mem: 8227052 1928564 6298488 0 72564 1695096
-/+ buffers/cache: 160904 8066148
Swap: 2096472 0 2096472
# cat /proc/cmdline
root=LABEL=/123 [EMAIL PROTECTED]
# kexec -p /boot/vmlinux-2.6.16-mm1-kdump.capture --args-linux \
> --elf64-core-headers --initrd=/boot/initrd-2.6.16-mm1-kdump.capture.img \
> --append="root=LABEL=/123 init 3"
# echo c > /proc/sysrq-trigger
(capture-kernel is booting.)
# uname -r
2.6.16-mm1-kdump.capture
# free
total used free shared buffers cached
Mem: 60516 53552 6964 0 1420 11756
-/+ buffers/cache: 40376 20140
Swap: 2096472 24216 2072256
# ll /proc/vmcore
-r-------- 1 root root 4226876448 3月 30 10:58 /proc/vmcore
#
--------------------------------------------------
>o Currently /proc/iomem exports physical memory also apart from io device
> memory. But on i386, it truncates any memory more than 4GB. This leads
> to problems for kexec/kdump.
>
>o Kexec reads /proc/iomem to determine the system memory layout and prepares
> a memory map based on that and passes it to the kernel being kexeced. Given
> the fact that memory more than 4GB has been truncated, new kernel never
> gets to see and use that memory.
>
>o Kdump also reads /proc/iomem to determine the physical memory layout of
> the system and encodes this informaiton in ELF headers. After a crash
> new kernel parses these ELF headers being used by previous kernel and
> vmcore is prepared accordingly. As memory more than 4GB has been truncated,
> kdump never sees that memory and never prepares ELF headers for it. Hence
> vmcore is truncated and limited to 4GB even if there is more physical
> memory in the system.
>
>o This patch exports memory more than 4GB through /proc/iomem on i386.
Thanks
Ken'ichi Ohmichi
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