CMM1 on Linux on System Z Doesn't Release Pages Above 2 GB

Solution Verified - Updated -

Issue

  • When running RHEL 5.5 under z/VM, cpuplugd interacts with CMM1 to manage memory. When cpuplugd "expands the balloon", CMM1 issues DIAG 10s to release pages to CP, but it only releases pages below the 2 GB line.

Environment

  • Red Hat Enterprise Linux, Version 5

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