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Commit 987bf6fe authored by Zhang Yanfei's avatar Zhang Yanfei Committed by Linus Torvalds
Browse files

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



Signed-off-by: default avatarZhang 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a11edb59

Documentation/kdump/kdump.txt

+6 −25
Original line number Original line Diff line number Diff line
@@ -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.

when using the elfcorehdr=[size[KMG]@]offset[KMG] syntax.









With the dump-capture kernel, you can access the memory image, or "old

With the dump-capture kernel, you can access the memory image through

memory," in two ways:

/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

- Through a /dev/oldmem device interface. A capture utility can read the

use analysis tools such as the GNU Debugger (GDB) and the Crash tool to

  device file and write out the memory in raw format. This is a raw dump

debug the dump file. This method ensures that the dump pages are correctly

  of memory. Analysis and capture tools must be intelligent enough to

ordered.

  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.









Setup and Installation

Setup and Installation
@@ -423,18 +416,6 @@ the following command: 




   cp /proc/vmcore <dump-file>

   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

Analysis

========

========