This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


[Xen-devel] [PATCH][XEN]xm dump command add on (TAKE 2)

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] [PATCH][XEN]xm dump command add on (TAKE 2)
From: Ken Hironaka <hironaka.ken@xxxxxxxxxxxxxxxx>
Date: Wed, 16 Aug 2006 17:24:40 +0900
Delivery-date: Wed, 16 Aug 2006 01:25:03 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
This is a TAKE 2 to the xm dump-core command to xend.
-the command name is now xm dump-core instead of xm dump
-the command takes long options --live, and --crash.
-with pause dump, the message that the domain will be paused has been
taken out
-when an interrupt is received during execution, the command will
automatically unpause the domain in question.

The below is basically the same info as before.
The command outputs the memory contents of the specified domU to a
coredump file.
This will fail if tried on dom0.
The specification is as follows:

xm dump-core [-L|--live][-C| --crash] <domID> [output path]

-L| --live Live dump:By default, xm dump does an xm pause, unpause before and
after taking the dump, respectively. This option disables the
pause/unpause and simply takes the dump.

-C :| --crash crash dump: This executes an xm destroy after the dump file is
The output path is optional, and if it is not specified, the path will
/var/xen/dump/<domU name>.<domU ID>.core

This command uses the existant dumpCore(), which has been used for
coredump when a domU crashed. 
In this patch, the xc_domain_dumpcore_via_callback() in xc_core.c of
libxc is also modified. Previously, the
xc_domain_dumpcore_via_callback() did not respond to error when
copy_from_domain_page() failed. In other words, the dump core remained
silent even if mapping the domain memory failed and its page could not
be copied. When this happened, erroneous data had been dumped to the
file without the user realizing it. Now, it has been modified so that if
copy_from_domain_page fails, this fact is recorded in the logfile.
However even in such cases, the dumping will continue as before.

Signed-off-by: Ken Hironaka <hironaka.ken@xxxxxxxxxxxxxxxx>


Attachment: xmdump.v2.patch
Description: Text Data

Xen-devel mailing list
<Prev in Thread] Current Thread [Next in Thread>
  • [Xen-devel] [PATCH][XEN]xm dump command add on (TAKE 2), Ken Hironaka <=