Re: which stack direction?
Keith Owens (kaos@ocs.com.au)
Sun, 14 Mar 1999 15:37:37 -0800
On Mon, 15 Mar 1999 08:12:39 +1300,
Chris Wedgwood <cw@ix.net.nz> wrote:
>On Fri, Mar 12, 1999 at 11:45:36AM -0800, Larry McVoy wrote:
>> "Does it matter to Linux whether the stacks in user codes run up
>> (pointer starts at a low address and increments to get more memory)
>> or down (pointer starts at a high address and decrements to get
>> more memory)? If it does matter, which is preferred?"
>
>As someone else has pointed out, if the stack doesn't grow down, then
>it not so easy to make the stack and the heap grow towards each
>other.
Why? Stack starts at the bottom and grows up, heap starts at the top
and "grows" down. There is no requirement for heap addresses to be in
any particular order. When heap is full, just grab the next page below
the lowest heap page, grab n pages if the entity requires more than one
page.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/