Messages in this thread | | | Date | Wed, 27 Jun 2007 12:22:52 -0700 (PDT) | From | Davide Libenzi <> | Subject | Re: [patch 2/3] MAP_NOZERO - implement sys_brk2() |
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On Wed, 27 Jun 2007, Rik van Riel wrote:
> Ulrich Drepper wrote: > > On 6/27/07, Hugh Dickins <hugh@veritas.com> 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.
You mean something like the F_DUPFD, where you pass an fd and that serves as from-there-up hint?
- Davide
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