On 06/30/2015 06:10 PM, Ian Campbell wrote:
On Thu, 2015-06-25 at 14:25 +0800, Yang Hongyang wrote:
We need to send secondary's dirty page pfns back to primary.
In v2 Ian asked (<21888.2988.774072.32...@mariner.uk.xensource.com>):
In the pdf
http://www.socc2013.org/home/program/a3-dong.pdf?attredirects=0
linked from the wiki page
http://wiki.xen.org/wiki/COLO_-_Coarse_Grain_Lock_Stepping
it says that the secondary keeps a copy of the original contents of
its dirty pages. So I don't understand why you need to send the dirty
bitmap to the primary.
Which I don't see an answer for in my archive. Have I missed (or
misplaced) the answer?
Sorry, seems that I misplaced the answer to:
[PATCH v2 COLOPre 09/13] tools/libxl: Update libxl_save_msgs_gen.pl to support
return data from xl to xc
> Thanks for this. I would have some comments on the details, but first
> I want to properly understand your use case. So while I'm the author
> and maintainer of this save helper, I won't review this in detail just
> yet. I'm following the thread about what this is for...
We need to send secondary's dirty page pfn back to primary. Primary will
then send pages that are both dirtied on primary/secondary to secondary.
in this way the secondary's memory will be consistent with primary.
As we disscussed in [PATCH v2 COLOPre 04/13] tools/libxc: export xc_bitops.h
If we move this operation to libxc layer, this patch could be dropped.
Ian
.
--
Thanks,
Yang.
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