In my case (virtualization) I want to test/profile guest under heavy swapping
of a guests memory, so I intentionally create memory shortage by creating
guest much large then host memory, but I want system to swap out only
guest's memory.

So this isn't an API question this is an obscure corner case testing
question.

quoted

It would be probably useful if you could point us to the application
source code that actually wants this feature.

This is two line patch to qemu that calls mlockall(MCL_CURRENT|MCL_FUTURE)
at the beginning of the main() and changes guest memory allocation to
use MAP_UNLOCKED flag. All alternative solutions in this thread suggest
that I should rewrite qemu + all library it uses. You see why I can't
take them seriously?

And you want millions of users to have kernels with weird extra functions
whole sole value is one test environment you wish to run

See why we can't take you seriously either ?

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