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Commit fd59d231 authored by Ken'ichi Ohmichi's avatar Ken'ichi Ohmichi Committed by Linus Torvalds
Browse files

Add vmcoreinfo 

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: default avatarDan Aloni <da-x@monatomic.org>
Signed-off-by: default avatarKen'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp>
Signed-off-by: default avatarBernhard Walle <bwalle@suse.de>
Signed-off-by: default avatarDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0e647c04

arch/ia64/kernel/machine_kexec.c

+30 −0
Original line number Diff line number Diff line
@@ -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;

}

arch/ia64/mm/discontig.c

+1 −1
Original line number Diff line number Diff line
@@ -48,7 +48,7 @@ struct early_node_data { 
static struct early_node_data mem_data[MAX_NUMNODES] __initdata;

static nodemask_t memory_less_mask __initdata;



static pg_data_t *pgdat_list[MAX_NUMNODES];

pg_data_t *pgdat_list[MAX_NUMNODES];



/*

 * To prevent cache aliasing effects, align per-node structures so that they

arch/x86/kernel/machine_kexec_32.c

+13 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/kexec.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/numa.h>

#include <asm/pgtable.h>

#include <asm/pgalloc.h>

#include <asm/tlbflush.h>
@@ -169,3 +170,15 @@ static int __init parse_crashkernel(char *arg) 
	return 0;

}

early_param("crashkernel", parse_crashkernel);



void arch_crash_save_vmcoreinfo(void)

{

#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE

	SYMBOL(node_data);

	LENGTH(node_data, MAX_NUMNODES);

#endif

#ifdef CONFIG_X86_PAE

	CONFIG(X86_PAE);

#endif

}

arch/x86/kernel/machine_kexec_64.c

+9 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/kexec.h>

#include <linux/string.h>

#include <linux/reboot.h>

#include <linux/numa.h>

#include <asm/pgtable.h>

#include <asm/tlbflush.h>

#include <asm/mmu_context.h>
@@ -257,3 +258,11 @@ static int __init setup_crashkernel(char *arg) 
}

early_param("crashkernel", setup_crashkernel);



void arch_crash_save_vmcoreinfo(void)

{

#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE

	SYMBOL(node_data);

	LENGTH(node_data, MAX_NUMNODES);

#endif

}

include/asm-ia64/numa.h

+1 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 


extern u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;

extern cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;

extern pg_data_t *pgdat_list[MAX_NUMNODES];



/* Stuff below this line could be architecture independent */