diff options
author | Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp> | 2007-10-16 23:27:27 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:54 -0700 |
commit | fd59d231f81cb02870b9cf15f456a897f3669b4e (patch) | |
tree | 5713c13bd678774f1ba3c42bfff5008c1812deae /include/linux | |
parent | 0e647c04f665e9b3451a1ebe8252b38ffe0207c8 (diff) |
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: 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>
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/kexec.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/kexec.h b/include/linux/kexec.h index 8c2c7fcd58ce..99f2d6f0c83a 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -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 */ |