In the last episode (Oct 22), Terry Lambert said:
> 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.
Ah, but take a look at the calls to brk, especially in map_pages() and
free_pages().
--
Dan Nelson
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