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Documentation/kdump/kdump.txt: remove /dev/oldmem description

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Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Dave Hansen <dave@sr71.net>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zhang Yanfei 2013-07-03 15:08:38 -07:00 committed by Linus Torvalds
parent a11edb59a0
commit 987bf6fe3b
1 changed files with 6 additions and 25 deletions
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Documentation/kdump/kdump.txt
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@ -47,19 +47,12 @@ parameter. Optionally the size of the ELF header can also be passed
when using the elfcorehdr=[size[KMG]@]offset[KMG] syntax.
With the dump-capture kernel, you can access the memory image, or "old
memory," in two ways:
- Through a /dev/oldmem device interface. A capture utility can read the
device file and write out the memory in raw format. This is a raw dump
of memory. Analysis and capture tools must be intelligent enough to
determine where to look for the right information.
- Through /proc/vmcore. This exports the dump as an ELF-format file that
you can write out using file copy commands such as cp or scp. Further,
you can use analysis tools such as the GNU Debugger (GDB) and the Crash
tool to debug the dump file. This method ensures that the dump pages are
correctly ordered.
With the dump-capture kernel, you can access the memory image through
/proc/vmcore. This exports the dump as an ELF-format file that you can
write out using file copy commands such as cp or scp. Further, you can
use analysis tools such as the GNU Debugger (GDB) and the Crash tool to
debug the dump file. This method ensures that the dump pages are correctly
ordered.
Setup and Installation
@ -423,18 +416,6 @@ the following command:
cp /proc/vmcore <dump-file>
You can also access dumped memory as a /dev/oldmem device for a linear
and raw view. To create the device, use the following command:
mknod /dev/oldmem c 1 12
Use the dd command with suitable options for count, bs, and skip to
access specific portions of the dump.
To see the entire memory, use the following command:
dd if=/dev/oldmem of=oldmem.001
Analysis
========