Linux kernel 4.11 (available here) has been released, improving Kernel Samepage Merging (KSM) support for KVM on z:
KSM is an existing feature of the Linux kernel that allows the kernel to merge pages with identical content, indicated as MADV_MERGEABLE via madvise(), across different processes to save memory.
This z Systems specific extension improves the performance of userspace applications (e.g. QEMU) in case large amounts of empty/zeroed pages are merged.
This feature is disabled by default, enable as follows:
$ echo 1 > /sys/kernel/mm/ksm/use_zero_pages
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