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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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110
kernel/kexec.c
View file

@ -21,16 +21,26 @@
#include <linux/hardirq.h>
#include <linux/elf.h>
#include <linux/elfcore.h>
#include <linux/utsrelease.h>
#include <linux/utsname.h>
#include <linux/numa.h>
#include <asm/page.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/semaphore.h>
#include <asm/sections.h>
/* Per cpu memory for storing cpu states in case of system crash. */
note_buf_t* crash_notes;
/* vmcoreinfo stuff */
unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
unsigned int vmcoreinfo_size = 0;
unsigned int vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
/* Location of the reserved area for the crash kernel */
struct resource crashk_res = {
.name = "Crash kernel",
@ -1060,6 +1070,7 @@ void crash_kexec(struct pt_regs *regs)
if (kexec_crash_image) {
struct pt_regs fixed_regs;
crash_setup_regs(&fixed_regs, regs);
crash_save_vmcoreinfo();
machine_crash_shutdown(&fixed_regs);
machine_kexec(kexec_crash_image);
}
@ -1134,3 +1145,102 @@ static int __init crash_notes_memory_init(void)
return 0;
}
module_init(crash_notes_memory_init)
void crash_save_vmcoreinfo(void)
{
u32 *buf;
if (!vmcoreinfo_size)
return;
vmcoreinfo_append_str("CRASHTIME=%d", xtime.tv_sec);
buf = (u32 *)vmcoreinfo_note;
buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
vmcoreinfo_size);
final_note(buf);
}
void vmcoreinfo_append_str(const char *fmt, ...)
{
va_list args;
char buf[0x50];
int r;
va_start(args, fmt);
r = vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (r + vmcoreinfo_size > vmcoreinfo_max_size)
r = vmcoreinfo_max_size - vmcoreinfo_size;
memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
vmcoreinfo_size += r;
}
/*
* provide an empty default implementation here -- architecture
* code may override this
*/
void __attribute__ ((weak)) arch_crash_save_vmcoreinfo(void)
{}
unsigned long __attribute__ ((weak)) paddr_vmcoreinfo_note(void)
{
return __pa((unsigned long)(char *)&vmcoreinfo_note);
}
static int __init crash_save_vmcoreinfo_init(void)
{
vmcoreinfo_append_str("OSRELEASE=%s\n", UTS_RELEASE);
vmcoreinfo_append_str("PAGESIZE=%d\n", PAGE_SIZE);
SYMBOL(init_uts_ns);
SYMBOL(node_online_map);
SYMBOL(swapper_pg_dir);
SYMBOL(_stext);
#ifndef CONFIG_NEED_MULTIPLE_NODES
SYMBOL(mem_map);
SYMBOL(contig_page_data);
#endif
#ifdef CONFIG_SPARSEMEM
SYMBOL(mem_section);
LENGTH(mem_section, NR_SECTION_ROOTS);
SIZE(mem_section);
OFFSET(mem_section, section_mem_map);
#endif
SIZE(page);
SIZE(pglist_data);
SIZE(zone);
SIZE(free_area);
SIZE(list_head);
OFFSET(page, flags);
OFFSET(page, _count);
OFFSET(page, mapping);
OFFSET(page, lru);
OFFSET(pglist_data, node_zones);
OFFSET(pglist_data, nr_zones);
#ifdef CONFIG_FLAT_NODE_MEM_MAP
OFFSET(pglist_data, node_mem_map);
#endif
OFFSET(pglist_data, node_start_pfn);
OFFSET(pglist_data, node_spanned_pages);
OFFSET(pglist_data, node_id);
OFFSET(zone, free_area);
OFFSET(zone, vm_stat);
OFFSET(zone, spanned_pages);
OFFSET(free_area, free_list);
OFFSET(list_head, next);
OFFSET(list_head, prev);
LENGTH(zone.free_area, MAX_ORDER);
arch_crash_save_vmcoreinfo();
return 0;
}
module_init(crash_save_vmcoreinfo_init)