question about commitlog segments and memlocking

[DE VITO Dominique]

Hi,

The instruction < CLibrary.tryMlockall(); > is called at the very beginning of 
the setup() Cassandra method.
So, the heap space is memlocked in memory (if OS rights are set).

"mlockall()" is called with "MCL_CURRENT" : "MCL_CURRENT  Lock all pages 
currently mapped into the process's address space."

So, AFAIU(nderstand), the commitlog segments (or other off-heap structures) are 
NOT memlocked, and may be swapped.

Is it also your understanding ?

If true, why not using "mlockall(MCL_FUTURE)" instead, or calling mlocka() 
after commitlog segments allocation ?

Thanks.

Regards,
Dominique