Re: [ofa-general] Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem)

Gleb Natapov
2008-02-26T07:21:49Z

On Tue, Feb 26, 2008 at 05:11:32PM +1100, Nick Piggin wrote:
> > You are missing one point here. The MPI specifications that have
> > been out there for decades do not require the process use a library
> > for allocating the buffer. I realize that is a horrible shortcoming,
> > but that is the world we live in. Even if we could change that spec,
>
> Can you change the spec?
Not really. It will break all existing codes. MPI-2 provides a call for
memory allocation (and it's beneficial to use this call for some interconnects),
but many (most?) applications are still written for MPI-1 and those that
are written for MPI-2 mostly uses the old habit of allocating memory by malloc(),
or even use stack or BSS memory for communication buffer purposes.

--
Gleb.