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Add vmcoreinfo

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This patch set frees the restriction that makedumpfile users should install a
vmlinux file (including the debugging information) into each system.

makedumpfile command is the dump filtering feature for kdump.  It creates a
small dumpfile by filtering unnecessary pages for the analysis.  To
distinguish unnecessary pages, it needs a vmlinux file including the debugging
information.  These days, the debugging package becomes a huge file, and it is
hard to install it into each system.

To solve the problem, kdump developers discussed it at lkml and kexec-ml.  As
the result, we reached the conclusion that necessary information for dump
filtering (called "vmcoreinfo") should be embedded into the first kernel file
and it should be accessed through /proc/vmcore during the second kernel.
(http://www.uwsg.iu.edu/hypermail/linux/kernel/0707.0/1806.html)

Dan Aloni created the patch set for the above implementation.
(http://www.uwsg.iu.edu/hypermail/linux/kernel/0707.1/1053.html)

And I updated it for multi architectures and memory models.
(http://lists.infradead.org/pipermail/kexec/2007-August/000479.html)

Signed-off-by: Dan Aloni <da-x@monatomic.org>
Signed-off-by: Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp>
Signed-off-by: Bernhard Walle <bwalle@suse.de>
Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ken'ichi Ohmichi 2007-10-16 23:27:27 -07:00 • committed by Linus Torvalds
parent 0e647c04f6
commit fd59d231f8
8 changed files with 200 additions and 1 deletions
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30
arch/ia64/kernel/machine_kexec.c
View file

@ -15,6 +15,8 @@
#include <linux/cpu.h>
#include <linux/irq.h>
#include <linux/efi.h>
#include <linux/numa.h>
#include <linux/mmzone.h>
#include <asm/mmu_context.h>
#include <asm/setup.h>
#include <asm/delay.h>
@ -121,3 +123,31 @@ void machine_kexec(struct kimage *image)
unw_init_running(ia64_machine_kexec, image);
for(;;);
}
void arch_crash_save_vmcoreinfo(void)
{
#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
SYMBOL(pgdat_list);
LENGTH(pgdat_list, MAX_NUMNODES);
SYMBOL(node_memblk);
LENGTH(node_memblk, NR_NODE_MEMBLKS);
SIZE(node_memblk_s);
OFFSET(node_memblk_s, start_paddr);
OFFSET(node_memblk_s, size);
#endif
#ifdef CONFIG_PGTABLE_3
CONFIG(PGTABLE_3);
#elif CONFIG_PGTABLE_4
CONFIG(PGTABLE_4);
#endif
}
unsigned long paddr_vmcoreinfo_note(void)
{
unsigned long vaddr, paddr;
vaddr = (unsigned long)(char *)&vmcoreinfo_note;
asm volatile ("tpa %0 = %1" : "=r"(paddr) : "r"(vaddr) : "memory");
return paddr;
}