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Re: [Xen-devel] Request a freeze exception for COLO in v4.6

On 07/17/2015 06:18 PM, Ian Jackson wrote:
Wei Liu writes ("Re: [Xen-devel] Request a freeze exception for COLO in v4.6"):
Ian and Ian, anything to add? What are your opinions?

I think COLO is an exciting and important feature.

Unfortunately I agree with Wei that at this stage taking both series
as they currently stand into 4.6 is not tenable.  (Perhaps if I had
been able to help earlier in the release cycle this would have been
different; so for that I'm sorry.)

I would like to see at least the early parts of `COLOPre' in staging
as soon as possible.  There is much preparatory work there which would
be annoying to rebase around, and which has collateral benefits.

Thanks, if you are going to merge some of the patches, there is the
latest version of `COLOPre' patchset:
The latest 26 commits.

I think all patches are ready to be merged except:
7  libxl/remus: init checkpoint_callback in Remus checkpoint callback
11 tools/libxc: support to resume uncooperative HVM guests
20 tools/libx{l,c}: add back channel to libxc

If I can take one example, 11/25 "tools/libxc: support to resume
uncooperative HVM guests".  Based on my current understanding this is
even a bugfix.  Sadly it is not quite ready (or at least, wasn't last
night).  But with a few more days we can probably get much of this
cleanup and preparatory work in.

Assuming nothing goes horribly wrong, I am very optimistic about COLO
making it upstream soon, just not in 4.6.



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