Re: [patch 2/3] MAP_NOZERO - implement sys_brk2()

[Rik van Riel]

Ulrich Drepper wrote:
> On 6/27/07, Hugh Dickins <hugh@xxxxxxxxxxx> wrote:
> > Not so: if an mmap can be done by extending either adjacent vma (prot
> > and flags and file and offset all match up), that's what's done and no
> > separate vma is created.  (And adjacent vmas get merged when mprotect
> > removes the difference in protection.)
>
> mmap return values are randomized.  If they would be mergable
> something would be wrong.

You can easily pass a hint address to mmap(), causing it to
extend a malloc arena instead of creating a new VMA.

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