If application does mlockall(MCL_FUTURE) it is no longer possible to mmap
file bigger than main memory or allocate big area of anonymous memory
in a thread safe manner. Sometimes it is desirable to lock everything
related to program execution into memory, but still be able to mmap
big file or allocate huge amount of memory and allow OS to swap them on
demand. MAP_UNLOCKED allows to do that.
 
Signed-off-by: Gleb Natapov <redacted>
---

I get reports that people find this useful, so resending.

This description is still wrong. It doesn't describe why this patch is useful.



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