Of course all such pages come from common block somewhere on Debian's build server. But there are no easy way to track this relationship at all! If you are thinking about shared libraries and such - this is different kettle of fish and THESE pages are shared already. KSM is designed to work with KVM and Xen where identical pages come from different virtual filesystems and thus from different physical places. May be in the future btrfs will change this, but KSM works here and now...
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