Re: [Xen-ia64-devel] [PATCH] fix live migration

[Kouya Shimura <kouya@xxxxxxxxxxxxxx>]

Hi Alex,

Sorry, I added a bug.
Here is a fixed one.

I'm now struggling with supporting HVM live migation.
HVM doesn't support log-dirty mode yet.

Thanks,
Kouya

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>

# HG changeset patch
# User Kouya Shimura <kouya@xxxxxxxxxxxxxx>
# Date 1202353020 -32400
# Node ID 1de053b23416ff223d32eb11117591f92a4b2cdf
# Parent  6b89a0f027c2b438d1f369cce0bc670cda1390d9
In live migration, a domain is paused and *entire* memory is copied
after pre-copy phase.
(i.e. live migration is not live)

diff -r 6b89a0f027c2 -r 1de053b23416 tools/libxc/ia64/xc_ia64_linux_save.c
--- a/tools/libxc/ia64/xc_ia64_linux_save.c     Wed Feb 06 19:21:45 2008 +0900
+++ b/tools/libxc/ia64/xc_ia64_linux_save.c     Thu Feb 07 11:57:00 2008 +0900
@@ -651,6 +651,9 @@ xc_domain_save(int xc_handle, int io_fd,
                     if (test_bit(N, to_skip) && test_bit(N, to_send))
                         skip_this_iter++;
                     if (test_bit(N, to_skip) || !test_bit(N, to_send))
+                        continue;
+                } else if (live) {
+                    if (!test_bit(N, to_send))
                         continue;
                 }
 

Alex Williamson writes:
> 
> On Wed, 2008-02-06 at 19:55 +0900, Kouya Shimura wrote:
> > In live migration, a domain is paused and *entire* memory is copied
> > after pre-copy phase.
> > (i.e. live migration is not live)
> 
> Hi Kouya,
> 
>    I'm excited that you're looking into making live migration "live",
> but this is causing my migration test to fail.  For a simple NFS root PV
> guest, I get this:
> 
> # xm migrate floater 10.91.73.214
> Error: /usr/lib/xen/bin/xc_save 22 6 0 0 0 failed
> Usage: xm migrate <Domain> <Host>
> ...
> 
> xend.log shows the following:
> 
> [2008-02-06 11:56:13 10652] DEBUG (__init__:1072) [xc_save]: 
> /usr/lib/xen/bin/xc
> _save 22 6 0 0 0
> [2008-02-06 11:56:13 10652] DEBUG (__init__:1072) suspend
> [2008-02-06 11:56:13 10652] DEBUG (__init__:1072) In saveInputHandler suspend
> [2008-02-06 11:56:13 10652] DEBUG (__init__:1072) Suspending 6 ...
> [2008-02-06 11:56:13 10652] DEBUG (__init__:1072) 
> XendDomainInfo.shutdown(suspen
> d)
> [2008-02-06 11:56:13 10652] DEBUG (__init__:1072) 
> XendDomainInfo.handleShutdownW
> atch
> [2008-02-06 11:56:13 10652] DEBUG (__init__:1072) 
> XendDomainInfo.handleShutdownW
> atch
> [2008-02-06 11:56:13 10652] INFO (__init__:1072) Domain has shutdown: 
> name=migra
> ting-floater id=6 reason=suspend.
> [2008-02-06 11:56:13 10652] INFO (__init__:1072) Domain 6 suspended.
> [2008-02-06 11:56:13 10652] DEBUG (__init__:1072) Written done
> [2008-02-06 11:56:13 10652] ERROR (__init__:1072) Save failed on domain 
> floater 
> (6).
> Traceback (most recent call last):
>   File "//usr/lib/python/xen/xend/XendCheckpoint.py", line 112, in save
>     forkHelper(cmd, fd, saveInputHandler, False)
>   File "//usr/lib/python/xen/xend/XendCheckpoint.py", line 369, in forkHelper
>     raise XendError("%s failed" % string.join(cmd))
> XendError: /usr/lib/xen/bin/xc_save 22 6 0 0 0 failed
> 
> Thanks,
> 
>       Alex
> 
> -- 
> Alex Williamson                             HP Open Source & Linux Org.

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