Marcelo Tosatti wrote:
How bad you think restarting is? Unless there are workloads with very large hugepage chains most of the data should be cached in L1. Also the fact that a 4K page has just been shadowed inside a large region makes it unlikely for the same chain to be examined again soon.
Non-pae guests will have a chain entry for every mm_struct, since the large ptes reside in the pgd and that is replicated for every mm_struct. So it's easy to have very long chains.
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