I've added /etc/security/limits.d/squeak.conf as per the instructions for a Cog Spur at http://www.mirandabanda.org/files/Cog/VM/VM.r3006/README.3006 (It's necessary because Cog Spur is _only_ a heartbeat VM on Linux.)
Simply adding the file is insufficient. Usually one needs to log out & log back in for the security changes to take effect. In Jenkins' case, that's a restart of the service.
I've just done that, but it seems to not have been sufficient. I'll dig further.
frank
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