Dan Nelson wrote:
> > The FreeBSD malloc uses anonymous pages mmap'ed off of /dev/zero.
> >
> > The Linux malloc uses pages added to the process address space via a
> > call to sbrk.
>
> Actually, on FreeBSD only the page directory is mmap'ed. Data returned
> to the user is allocated via sbrk.
Please see:
/usr/src/lib/libc/stdlib/malloc.c
The only calls to sbrk have a 0 argument. This is only used to find
the segment end, so that the mmap's do not occur over top of anything
important.
-- Terry
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