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This works well enough. However, I think that making the determination based on the kernel-supplied indication of anonymous vs file-backed may make more sense. (Linux 2.6's behavior may be changing in this regard, and using that as a determining factor rather than just permission bits.) That would require changing the to_find_memory_regions interface as I described earlier. Can you comment on that?
Sounds reasonable -- is it portable? A portable testcase for the testsuite would make the change fairly easy to evaluate / approve.
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