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Process_Reap Syscall Proposed For Linux To More Quickly Reclaim Memory Under Pressure

Submitted by Roy Schestowitz on Monday 12th of July 2021 08:46:35 AM Filed under
Linux

While there are the likes of OOMD / systemd-oomd gaining acceptance as a daemon for Linux systems to deal with killing off processes and other behavior under system memory (RAM) pressure, there still is an issue of the time it takes until the memory is reclaimed by those dying processes. Google engineers at the end of June proposed "process_reap" as a new system call to help in that memory recovery.

The proposed process_reap system call is designed to reclaim memory of a dying process from the context of the caller. Using process_reap should allow the memory to be freed faster with the CPU affinity and priority of the caller. Process_reap can only be used on processes that are dying via SIGKILL such as when triggered via out-of-memory / memory pressure daemons.

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