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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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26
include/linux/kexec.h
View file

@ -121,6 +121,23 @@ extern struct page *kimage_alloc_control_pages(struct kimage *image,
extern void crash_kexec(struct pt_regs *);
int kexec_should_crash(struct task_struct *);
void crash_save_cpu(struct pt_regs *regs, int cpu);
void crash_save_vmcoreinfo(void);
void arch_crash_save_vmcoreinfo(void);
void vmcoreinfo_append_str(const char *fmt, ...);
unsigned long paddr_vmcoreinfo_note(void);
#define SYMBOL(name) \
vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
#define SIZE(name) \
vmcoreinfo_append_str("SIZE(%s)=%d\n", #name, sizeof(struct name))
#define OFFSET(name, field) \
vmcoreinfo_append_str("OFFSET(%s.%s)=%d\n", #name, #field, \
&(((struct name *)0)->field))
#define LENGTH(name, value) \
vmcoreinfo_append_str("LENGTH(%s)=%d\n", #name, value)
#define CONFIG(name) \
vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
extern struct kimage *kexec_image;
extern struct kimage *kexec_crash_image;
@ -148,11 +165,20 @@ extern struct kimage *kexec_crash_image;
#define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */
#define VMCOREINFO_BYTES (4096)
#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
+ VMCOREINFO_NOTE_NAME_BYTES)
/* Location of a reserved region to hold the crash kernel.
*/
extern struct resource crashk_res;
typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
extern note_buf_t *crash_notes;
extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
extern unsigned int vmcoreinfo_size;
extern unsigned int vmcoreinfo_max_size;
#else /* !CONFIG_KEXEC */