HI Sahil:
Sorry for the late response.
Busy these days, since we met a serious issue on 2.6.32 kernel.
AFAIK, we don't special patch on 2.6.31. I think you could get from here
http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=shortlog;h=refs/heads/xen/stable-2.6.31.x
In memory sharing, domU will first allocate a page, and grant access to dom0, and here need a gref.
So that is, a gref is refer to a machine frame. During sharing, two domUs will have two gref, and Xen
will use these two gref to find MFN, if the MFN is the same, then one MFN is free, that share work.
Above is my understaning, I am not sure whether gref 0 is sharable(maybe someone from devel can
detail more), but indeed, when sharing, their are gref, not 0.
Thanks.
From: sahil@xxxxxxxxxxxxxx
Date: Thu, 7 Apr 2011 16:47:12 -0400
Subject: Re: Xen page sharing
To: tinnycloud@xxxxxxxxxxx
Also, I do not have any particular preference for the 2.6.32 kernel, I chose it only because it was recommended on the Xen wiki. If the blkback in 2.6.31 kernel based Dom0 works for you wrt xen page sharing, I would not mind switching over to that. Can you please let me know what patches did you apply to 2.6.31?
Regards,
Sahil
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