Ulrich Drepper wrote:
On 6/27/07, Hugh Dickins <[email protected]> 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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