Re: [Qemu-devel] [PATCH] migration: avoid starting a new migration task while the previous one still exist

[Eric Blake]

On 11/04/2013 04:26 AM, Zhanghaoyu (A) wrote:
> Avoid starting a new migration task while the previous one still exist.
> 
> Signed-off-by: Zeng Junliang <address@hidden>
> ---

It's best to put comments here...

>  migration.c |   34 ++++++++++++++++++++++------------
>  1 files changed, 22 insertions(+), 12 deletions(-)
...

>          s->downtime = end_time - start_time;
> -- 1.7.3.1.msysgit.0 BTW, while error happened during migration, need
> the "erroring" state to avoid starting a new migration task while
> current migration task still exist? And, do the new added migration
> states need to be reported to libvirt?

...rather than here, since most mail clients will strip anything after
the '-- ' separator output by git as if it were the signature, making it
very difficult to reply to (as you can see, my mailer corrupted the
formatting of your question due to how I forced it to reply to your
signature).

As to whether libvirt needs to know about the state, I'm not sure.
Libvirt already has its own code to prevent concurrent attempts at
migration, so theoretically libvirt should never trip the situation that
you appear to be coding for.  Perhaps providing more details in the
commit message about how to actually get into the situation will make it
easier to evaluate.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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