diff options
| author | Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp> | 2007-10-16 23:27:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:54 -0700 |
| commit | fd59d231f81cb02870b9cf15f456a897f3669b4e (patch) | |
| tree | 5713c13bd678774f1ba3c42bfff5008c1812deae /kernel/ksysfs.c | |
| parent | 0e647c04f665e9b3451a1ebe8252b38ffe0207c8 (diff) | |
| download | lwn-fd59d231f81cb02870b9cf15f456a897f3669b4e.tar.gz lwn-fd59d231f81cb02870b9cf15f456a897f3669b4e.zip | |
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 'kernel/ksysfs.c')
| -rw-r--r-- | kernel/ksysfs.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c index 6046939d0804..38b38f957ef0 100644 --- a/kernel/ksysfs.c +++ b/kernel/ksysfs.c @@ -61,6 +61,15 @@ static ssize_t kexec_crash_loaded_show(struct kset *kset, char *page) return sprintf(page, "%d\n", !!kexec_crash_image); } KERNEL_ATTR_RO(kexec_crash_loaded); + +static ssize_t vmcoreinfo_show(struct kset *kset, char *page) +{ + return sprintf(page, "%lx %x\n", + paddr_vmcoreinfo_note(), + vmcoreinfo_max_size); +} +KERNEL_ATTR_RO(vmcoreinfo); + #endif /* CONFIG_KEXEC */ /* @@ -96,6 +105,7 @@ static struct attribute * kernel_attrs[] = { #ifdef CONFIG_KEXEC &kexec_loaded_attr.attr, &kexec_crash_loaded_attr.attr, + &vmcoreinfo_attr.attr, #endif NULL }; |