This doesn't answer your question, but still: I'd be wary about using ConstrainKmemSpace at all. At least in the kernels on RedHat/CentOS <= 7.9, there is a bug in that eventually prevents Slurm from starting new job steps on a node, and the node has to be rebooted to be usable again. See for instance https://bugs.schedmd.com/show_bug.cgi?id=5507. (The bug report is old, but we got that result on a system with RHEL 7.7 earlier this year.)
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