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

2008-02-26 Thread Robin Holt
On Tue, Feb 26, 2008 at 07:52:41PM +1100, Nick Piggin wrote: > On Tuesday 26 February 2008 18:21, Gleb Natapov wrote: > > 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

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

2008-02-26 Thread KOSAKI Motohiro
> > > > Can you change the spec? > > > > > > Not really. It will break all existing codes. > > > > I meant as in eg. submit changes to MPI-3 > > MPI spec tries to be backward compatible. And MPI-2 spec is 10 years > old, but MPI-1 is still in a wider use. HPC is moving fast in terms of HW >

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

2008-02-26 Thread Gleb Natapov
On Tue, Feb 26, 2008 at 07:52:41PM +1100, Nick Piggin wrote: > On Tuesday 26 February 2008 18:21, Gleb Natapov wrote: > > 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

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

2008-02-26 Thread Nick Piggin
On Tuesday 26 February 2008 18:21, Gleb Natapov wrote: > 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.

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

2008-02-26 Thread Nick Piggin
On Tuesday 26 February 2008 18:21, Gleb Natapov wrote: 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

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

2008-02-26 Thread Gleb Natapov
On Tue, Feb 26, 2008 at 07:52:41PM +1100, Nick Piggin wrote: On Tuesday 26 February 2008 18:21, Gleb Natapov wrote: 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

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

2008-02-26 Thread KOSAKI Motohiro
Can you change the spec? Not really. It will break all existing codes. I meant as in eg. submit changes to MPI-3 MPI spec tries to be backward compatible. And MPI-2 spec is 10 years old, but MPI-1 is still in a wider use. HPC is moving fast in terms of HW technology, but slow in

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

2008-02-26 Thread Robin Holt
On Tue, Feb 26, 2008 at 07:52:41PM +1100, Nick Piggin wrote: On Tuesday 26 February 2008 18:21, Gleb Natapov wrote: 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