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Linux To Allow Adjusting pid_max Per PID Namespace - Helping Old Software
The pid_max tunable for the maximum number of process IDs allowed simultaneously was increased by default back in 2019 with systemd
Christian Brauner of Microsoft sent out the PID namespace pull request this weekend in advance of the Linux 6.14 merge window opening. Of course, giving containers the ability to restrict the number of processes in their respective pid namespace [independent] of the global limit through pid_max is something desirable in itself and comes in handy in general. Independent of motivating use-cases the existence of pid namespaces makes this also a good semantical extension and there have been prior proposals pushing in a similar direction.
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