mfs/mdconfig under RELENG_5: malloc vs swap-backed

[Dmitry Morozovsky]

Dear colleagues,

can anyone please point me why mdconfig method for tmpmfs  
is malloc-backed instead of swap-backed, and it is hardcoded into rc.subr? 

Are swap-backed file systems so inefficient? If no, why not move -M to 
/etc/defaultc/rc.conf so admin can override this behaviour?

Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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