Bruce Momjian wrote:
Andrew Dunstan wrote:
I believe that the swap slot can be subsequently freed, though. In theory your available virtual memory should be (almost) RAM+swap. In practice, Linux can run too close to that limit, (or way over it if you turn the checks off). But restricting the maximum possible pages to RAM/2 + swap should normally be fine. IANAKH, though.
Also note that the truly bad thing about the OOM killer is that it can affect a process that is not making any new memory demands at all.
How does the OOM killer kill processes, kill -9 or kill -1 and wait?
It sends a SIGKILL (9) unless the process is doing raw io, in which case it sends SIGTERM (15). It can't really wait - at this stage the kernel is in trouble - it can either kill processes or panic. The whole idea of strict accounting is not to let it get to this stage in the first place.
see mm/oom_kill.c
cheers
andrew
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