Messages in this thread | | | Date | Wed, 27 Jun 2007 15:00:00 -0400 | From | Rik van Riel <> | Subject | Re: [patch 2/3] MAP_NOZERO - implement sys_brk2() |
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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.
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