On 2008-08-26 at 14:27:02 [+0200], julun <host.haiku@xxxxxx> wrote:
i wonder what's more expensive, create_area or resize_area? Is there
any difference at all?
create_area() creates a new set of kernel structures to manage an area
(vm_area and VM*Cache), which isn't really spectacular, though. That aside
neither call does very much for B_NO_LOCK areas. The actual work (page
allocation and mapping) happens later, when the new pages of the area are
touched. It's also worth considering that resize_area() will fail, if the
address space range following the area is not free.
If you're allocating potentially much new memory in relatively small
increments, it is probably better to try resizing first, or you'll end up
with lots of small areas.
