Is it possible tell the JVM to hint the OS that a certain object should preferably not get pushed out to swap space?
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Is it possible tell the JVM to hint the OS that a certain object should preferably not get pushed out to swap space?
The short answer is no.
Java doesn’t allow you any control over what is swapped in and what is ‘pinned’ into RAM.
Worrying about this sort of thing is usually a sign that there is something else wrong in your project. The OS will on the whole do a much better job of working out what should be swapped and what shouldn’t. Your job is to write your software such that it doesn’t try to second guess what underlying VM/OS is going to do, just concentrate on delivering your features and a good design.