Hi!
> Yes you wrote that already and my counter argument was that this generic
> posix interface shouldn't bypass virtual memory abstraction.
>
> > > > The contiguous allocations are particularly useful for the RDMA API
> > > > which
> > > > allows registering user space memory with devices.
> > >
> > > then make those devices expose an implementation of an mmap which does
> > > that. You would get both a proper access control (via fd), accounting
> > > and others.
> >
> > There are numerous RDMA devices that would all need the mmap
> > implementation. And this covers only the needs of one subsystem. There are
> > other use cases.
>
> That doesn't prevent providing a library function which could be reused
> by all those drivers. Nothing really too much different from
> remap_pfn_range.
So you'd suggest using ioctl() for allocating memory?
That sounds quite ugly to me... mmap(MAP_CONTIG) is not nice, either, but
better than
each driver inventing custom interface...
Pavel
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