This mirrors a similar check in Linux kernel 5.16 (9dcc38e2813e0cd3b195940c98b181ce6ede8f20) that raised the RLIMIT_MEMLOCK to 8M. This change does two things: raise the default limit for nspawn containers (where we try to mimic closely what the kernel does), and bump it when running on old kernels which still have the lower setting. Fixes: #16300 See: https://lwn.net/Articles/876288/
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