Re: missing madvise functionality

[Andi Kleen]

Ulrich Drepper <drepper@xxxxxxxxxx> writes:

>   to free:      mmap(PROT_NONE) over the area

Why do you need a lock for that? I don't see any problem with
two threads doing that in parallel. The kernel would
serialize it internally and one would fail, but that shouldn't
be a problem. 

Of course having the lock should also not make much difference --
if glibc doesn't do it then it kernel would anyways and run
into the same scalability issue on mmap_sem.

-Andi

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