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s390/kvm: support collaborative memory management
This patch enables Collaborative Memory Management (CMM) for kvm on s390. CMM allows the guest to inform the host about page usage (see arch/s390/mm/cmm.c). The host uses this information to avoid swapping in unused pages in the page fault handler. Further, a CPU provided list of unused invalid pages is processed to reclaim swap space of not yet accessed unused pages. [ Martin Schwidefsky: patch reordering and cleanup ] Signed-off-by: Konstantin Weitz <email@example.com> Signed-off-by: Martin Schwidefsky <firstname.lastname@example.org>
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