From: glebn@voltaire.com (Gleb Natapov)
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Robin Holt <holt@sgi.com>,
steiner@sgi.com, Andrea Arcangeli <andrea@qumranet.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-mm@kvack.org, Izik Eidus <izike@qumranet.com>,
Kanoj Sarcar <kanojsarcar@yahoo.com>,
Roland Dreier <rdreier@cisco.com>,
linux-kernel@vger.kernel.org, Avi Kivity <avi@qumranet.com>,
kvm-devel@lists.sourceforge.net, daniel.blueman@quadrics.com,
general@lists.openfabrics.org, akpm@linux-foundation.org,
Christoph Lameter <clameter@sgi.com>
Subject: Re: [ofa-general] Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem)
Date: Tue, 26 Feb 2008 09:21:37 +0200 [thread overview]
Message-ID: <20080226072137.GD26611@minantech.com> (raw)
In-Reply-To: <200802261711.33213.nickpiggin@yahoo.com.au>
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.
WARNING: multiple messages have this Message-ID (diff)
From: glebn@voltaire.com (Gleb Natapov)
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrea Arcangeli <andrea@qumranet.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Izik Eidus <izike@qumranet.com>,
Kanoj Sarcar <kanojsarcar@yahoo.com>,
Roland Dreier <rdreier@cisco.com>,
steiner@sgi.com, linux-kernel@vger.kernel.org,
Avi Kivity <avi@qumranet.com>,
linux-mm@kvack.org, daniel.blueman@quadrics.com,
Robin Holt <holt@sgi.com>,
general@lists.openfabrics.org, akpm@linux-foundation.org,
Christoph Lameter <clameter@sgi.com>,
kvm-devel@lists.sourceforge.net
Subject: Re: [ofa-general] Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem)
Date: Tue, 26 Feb 2008 09:21:37 +0200 [thread overview]
Message-ID: <20080226072137.GD26611@minantech.com> (raw)
In-Reply-To: <200802261711.33213.nickpiggin@yahoo.com.au>
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.
WARNING: multiple messages have this Message-ID (diff)
From: glebn@voltaire.com (Gleb Natapov)
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Robin Holt <holt@sgi.com>,
steiner@sgi.com, Andrea Arcangeli <andrea@qumranet.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-mm@kvack.org, Izik Eidus <izike@qumranet.com>,
Kanoj Sarcar <kanojsarcar@yahoo.com>,
Roland Dreier <rdreier@cisco.com>,
linux-kernel@vger.kernel.org, Avi Kivity <avi@qumranet.com>,
kvm-devel@lists.sourceforge.net, daniel.blueman@quadrics.com,
general@lists.openfabrics.org, akpm@linux-foundation.org,
Christoph Lameter <clameter@sgi.com>
Subject: Re: [ofa-general] Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem)
Date: Tue, 26 Feb 2008 09:21:37 +0200 [thread overview]
Message-ID: <20080226072137.GD26611@minantech.com> (raw)
In-Reply-To: <200802261711.33213.nickpiggin@yahoo.com.au>
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.
--
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next prev parent reply other threads:[~2008-02-26 7:21 UTC|newest]
Thread overview: 256+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-15 6:48 [patch 0/6] MMU Notifiers V7 Christoph Lameter
2008-02-15 6:48 ` [ofa-general] " Christoph Lameter
2008-02-15 6:49 ` [patch 1/6] mmu_notifier: Core code Christoph Lameter
2008-02-15 6:49 ` Christoph Lameter
2008-02-16 3:37 ` Andrew Morton
2008-02-16 3:37 ` Andrew Morton
2008-02-16 3:37 ` [ofa-general] " Andrew Morton
2008-02-16 8:45 ` Avi Kivity
2008-02-16 8:45 ` Avi Kivity
2008-02-16 8:45 ` Avi Kivity
2008-02-16 8:56 ` Andrew Morton
2008-02-16 8:56 ` Andrew Morton
2008-02-16 8:56 ` [ofa-general] " Andrew Morton
2008-02-16 9:21 ` Avi Kivity
2008-02-16 9:21 ` Avi Kivity
2008-02-16 9:21 ` Avi Kivity
2008-02-16 10:41 ` Brice Goglin
2008-02-16 10:41 ` Brice Goglin
2008-02-16 10:58 ` Andrew Morton
2008-02-16 10:58 ` Andrew Morton
2008-02-16 19:31 ` Christoph Lameter
2008-02-16 19:31 ` Christoph Lameter
2008-02-16 19:21 ` Christoph Lameter
2008-02-16 19:21 ` Christoph Lameter
2008-02-16 19:21 ` [ofa-general] " Christoph Lameter
2008-02-17 3:01 ` Andrea Arcangeli
2008-02-17 3:01 ` Andrea Arcangeli
2008-02-17 3:01 ` [ofa-general] " Andrea Arcangeli
2008-02-17 12:24 ` Robin Holt
2008-02-17 12:24 ` Robin Holt
2008-02-17 12:24 ` Robin Holt
2008-02-17 5:04 ` Doug Maxey
2008-02-17 5:04 ` Doug Maxey
2008-02-17 5:04 ` Doug Maxey
2008-02-18 22:33 ` Roland Dreier
2008-02-18 22:33 ` Roland Dreier
2008-02-18 22:33 ` [ofa-general] " Roland Dreier
2008-02-15 6:49 ` [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-02-15 6:49 ` Christoph Lameter
2008-02-16 3:37 ` Andrew Morton
2008-02-16 3:37 ` Andrew Morton
2008-02-16 3:37 ` [ofa-general] " Andrew Morton
2008-02-16 19:26 ` Christoph Lameter
2008-02-16 19:26 ` Christoph Lameter
2008-02-16 19:26 ` [ofa-general] " Christoph Lameter
2008-02-19 8:54 ` Nick Piggin
2008-02-19 8:54 ` Nick Piggin
2008-02-19 8:54 ` [ofa-general] " Nick Piggin
2008-02-19 13:34 ` Andrea Arcangeli
2008-02-19 13:34 ` Andrea Arcangeli
2008-02-19 13:34 ` Andrea Arcangeli
2008-02-27 22:23 ` Christoph Lameter
2008-02-27 22:23 ` Christoph Lameter
2008-02-27 22:23 ` Christoph Lameter
2008-02-27 23:57 ` Andrea Arcangeli
2008-02-27 23:57 ` Andrea Arcangeli
2008-02-27 23:57 ` Andrea Arcangeli
2008-02-19 23:08 ` Nick Piggin
2008-02-19 23:08 ` Nick Piggin
2008-02-19 23:08 ` [ofa-general] " Nick Piggin
2008-02-20 1:00 ` Andrea Arcangeli
2008-02-20 1:00 ` Andrea Arcangeli
2008-02-20 1:00 ` Andrea Arcangeli
2008-02-20 3:00 ` Robin Holt
2008-02-20 3:00 ` Robin Holt
2008-02-20 3:00 ` Robin Holt
2008-02-20 3:11 ` Nick Piggin
2008-02-20 3:11 ` Nick Piggin
2008-02-20 3:11 ` Nick Piggin
2008-02-20 3:19 ` Robin Holt
2008-02-20 3:19 ` Robin Holt
2008-02-20 3:19 ` [ofa-general] " Robin Holt
2008-02-27 22:39 ` Christoph Lameter
2008-02-27 22:39 ` Christoph Lameter
2008-02-27 22:39 ` Christoph Lameter
2008-02-28 0:38 ` Andrea Arcangeli
2008-02-28 0:38 ` Andrea Arcangeli
2008-02-28 0:38 ` Andrea Arcangeli
2008-02-27 22:35 ` Christoph Lameter
2008-02-27 22:35 ` Christoph Lameter
2008-02-27 22:35 ` [ofa-general] " Christoph Lameter
2008-02-27 22:42 ` Jack Steiner
2008-02-27 22:42 ` Jack Steiner
2008-02-27 22:42 ` [ofa-general] " Jack Steiner
2008-02-28 0:10 ` Christoph Lameter
2008-02-28 0:10 ` Christoph Lameter
2008-02-28 0:10 ` Christoph Lameter
2008-02-28 0:11 ` Andrea Arcangeli
2008-02-28 0:11 ` Andrea Arcangeli
2008-02-28 0:11 ` [ofa-general] " Andrea Arcangeli
2008-02-28 0:14 ` Christoph Lameter
2008-02-28 0:14 ` Christoph Lameter
2008-02-28 0:14 ` Christoph Lameter
2008-02-28 0:52 ` Andrea Arcangeli
2008-02-28 0:52 ` Andrea Arcangeli
2008-02-28 0:52 ` [ofa-general] " Andrea Arcangeli
2008-02-28 1:03 ` Christoph Lameter
2008-02-28 1:03 ` Christoph Lameter
2008-02-28 1:03 ` Christoph Lameter
2008-02-28 1:10 ` Andrea Arcangeli
2008-02-28 1:10 ` Andrea Arcangeli
2008-02-28 1:10 ` Andrea Arcangeli
2008-02-28 18:43 ` Christoph Lameter
2008-02-28 18:43 ` Christoph Lameter
2008-02-28 18:43 ` [ofa-general] " Christoph Lameter
2008-02-29 0:55 ` Andrea Arcangeli
2008-02-29 0:55 ` Andrea Arcangeli
2008-02-29 0:55 ` Andrea Arcangeli
2008-02-29 0:59 ` Christoph Lameter
2008-02-29 0:59 ` Christoph Lameter
2008-02-29 0:59 ` [ofa-general] " Christoph Lameter
2008-02-29 13:13 ` Andrea Arcangeli
2008-02-29 13:13 ` Andrea Arcangeli
2008-02-29 13:13 ` Andrea Arcangeli
2008-02-29 19:55 ` Christoph Lameter
2008-02-29 19:55 ` Christoph Lameter
2008-02-29 19:55 ` [ofa-general] " Christoph Lameter
2008-02-29 20:17 ` Andrea Arcangeli
2008-02-29 20:17 ` Andrea Arcangeli
2008-02-29 20:17 ` Andrea Arcangeli
2008-02-29 21:03 ` Christoph Lameter
2008-02-29 21:03 ` Christoph Lameter
2008-02-29 21:03 ` [ofa-general] " Christoph Lameter
2008-02-29 21:23 ` Andrea Arcangeli
2008-02-29 21:23 ` Andrea Arcangeli
2008-02-29 21:23 ` Andrea Arcangeli
2008-02-29 21:29 ` Christoph Lameter
2008-02-29 21:29 ` Christoph Lameter
2008-02-29 21:29 ` Christoph Lameter
2008-02-29 21:34 ` Christoph Lameter
2008-02-29 21:34 ` Christoph Lameter
2008-02-29 21:34 ` Christoph Lameter
2008-02-29 21:48 ` Andrea Arcangeli
2008-02-29 21:48 ` Andrea Arcangeli
2008-02-29 21:48 ` [ofa-general] " Andrea Arcangeli
2008-02-29 22:12 ` Christoph Lameter
2008-02-29 22:12 ` Christoph Lameter
2008-02-29 22:12 ` Christoph Lameter
2008-02-29 22:41 ` Andrea Arcangeli
2008-02-29 22:41 ` Andrea Arcangeli
2008-02-29 22:41 ` [ofa-general] " Andrea Arcangeli
2008-02-28 10:53 ` Robin Holt
2008-02-28 10:53 ` Robin Holt
2008-02-28 10:53 ` [ofa-general] " Robin Holt
2008-03-03 5:11 ` Nick Piggin
2008-03-03 5:11 ` Nick Piggin
2008-03-03 5:11 ` Nick Piggin
2008-03-03 19:28 ` Christoph Lameter
2008-03-03 19:28 ` Christoph Lameter
2008-03-03 19:28 ` [ofa-general] " Christoph Lameter
2008-03-03 19:50 ` Nick Piggin
2008-03-03 19:50 ` Nick Piggin
2008-03-04 18:58 ` Christoph Lameter
2008-03-04 18:58 ` Christoph Lameter
2008-03-04 18:58 ` Christoph Lameter
2008-03-05 0:52 ` Nick Piggin
2008-03-05 0:52 ` Nick Piggin
2008-02-15 6:49 ` [patch 3/6] mmu_notifier: invalidate_page callbacks Christoph Lameter
2008-02-15 6:49 ` Christoph Lameter
2008-02-16 3:37 ` Andrew Morton
2008-02-16 3:37 ` Andrew Morton
2008-02-16 3:37 ` [ofa-general] " Andrew Morton
2008-02-16 11:07 ` Andrea Arcangeli
2008-02-16 11:07 ` Andrea Arcangeli
2008-02-16 11:07 ` Andrea Arcangeli
2008-02-16 19:22 ` Christoph Lameter
2008-02-16 19:22 ` Christoph Lameter
2008-02-16 19:22 ` [ofa-general] " Christoph Lameter
2008-02-16 19:54 ` Avi Kivity
2008-02-16 19:54 ` Avi Kivity
2008-02-16 19:54 ` [ofa-general] " Avi Kivity
2008-02-19 8:46 ` Nick Piggin
2008-02-19 8:46 ` Nick Piggin
2008-02-19 8:46 ` [ofa-general] " Nick Piggin
2008-02-19 13:30 ` Andrea Arcangeli
2008-02-19 13:30 ` Andrea Arcangeli
2008-02-19 13:30 ` [ofa-general] " Andrea Arcangeli
2008-02-18 1:51 ` Nick Piggin
2008-02-18 1:51 ` Nick Piggin
2008-02-18 1:51 ` Nick Piggin
2008-02-15 6:49 ` [patch 4/6] mmu_notifier: Skeleton driver for a simple mmu_notifier Christoph Lameter
2008-02-15 6:49 ` Christoph Lameter
2008-02-15 6:49 ` [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem) Christoph Lameter
2008-02-15 6:49 ` Christoph Lameter
2008-02-16 3:37 ` Andrew Morton
2008-02-16 3:37 ` Andrew Morton
2008-02-16 3:37 ` [ofa-general] " Andrew Morton
2008-02-16 19:28 ` Christoph Lameter
2008-02-16 19:28 ` Christoph Lameter
2008-02-16 19:28 ` [ofa-general] " Christoph Lameter
2008-02-19 23:55 ` Nick Piggin
2008-02-19 23:55 ` Nick Piggin
2008-02-19 23:55 ` [ofa-general] " Nick Piggin
2008-02-20 3:12 ` Robin Holt
2008-02-20 3:12 ` Robin Holt
2008-02-20 3:12 ` [ofa-general] " Robin Holt
2008-02-20 3:51 ` Nick Piggin
2008-02-20 3:51 ` Nick Piggin
2008-02-20 3:51 ` [ofa-general] " Nick Piggin
2008-02-20 9:00 ` Robin Holt
2008-02-20 9:00 ` Robin Holt
2008-02-20 9:00 ` [ofa-general] " Robin Holt
2008-02-20 9:05 ` Robin Holt
2008-02-20 9:05 ` Robin Holt
2008-02-20 9:05 ` Robin Holt
2008-02-21 4:20 ` Nick Piggin
2008-02-21 4:20 ` Nick Piggin
2008-02-21 10:58 ` Robin Holt
2008-02-21 10:58 ` Robin Holt
2008-02-21 10:58 ` Robin Holt
2008-02-26 6:11 ` Nick Piggin
2008-02-26 6:11 ` Nick Piggin
2008-02-26 6:11 ` Nick Piggin
2008-02-26 7:21 ` Gleb Natapov [this message]
2008-02-26 7:21 ` [ofa-general] " Gleb Natapov
2008-02-26 7:21 ` Gleb Natapov
2008-02-26 8:52 ` Nick Piggin
2008-02-26 8:52 ` Nick Piggin
2008-02-26 8:52 ` Nick Piggin
2008-02-26 9:38 ` Gleb Natapov
2008-02-26 9:38 ` Gleb Natapov
2008-02-26 9:38 ` Gleb Natapov
2008-02-26 9:52 ` KOSAKI Motohiro
2008-02-26 9:52 ` KOSAKI Motohiro
2008-02-26 9:52 ` KOSAKI Motohiro
2008-02-26 12:28 ` Robin Holt
2008-02-26 12:28 ` Robin Holt
2008-02-26 12:28 ` Robin Holt
2008-02-26 12:29 ` Robin Holt
2008-02-26 12:29 ` Robin Holt
2008-02-26 12:29 ` [ofa-general] " Robin Holt
2008-02-27 22:43 ` Christoph Lameter
2008-02-27 22:43 ` Christoph Lameter
2008-02-27 22:43 ` [ofa-general] " Christoph Lameter
2008-02-28 0:42 ` Andrea Arcangeli
2008-02-28 0:42 ` Andrea Arcangeli
2008-02-28 0:42 ` [ofa-general] " Andrea Arcangeli
2008-02-28 1:01 ` Christoph Lameter
2008-02-28 1:01 ` Christoph Lameter
2008-02-28 1:01 ` Christoph Lameter
2008-02-15 6:49 ` [patch 6/6] mmu_rmap_notifier: Skeleton for complex driver that uses its own rmaps Christoph Lameter
2008-02-15 6:49 ` Christoph Lameter
2008-02-16 10:48 ` [PATCH] KVM swapping with MMU Notifiers V7 Andrea Arcangeli
2008-02-16 10:48 ` Andrea Arcangeli
2008-02-16 10:48 ` Andrea Arcangeli
2008-02-16 11:08 ` Andrew Morton
2008-02-16 11:08 ` Andrew Morton
2008-02-16 11:08 ` [ofa-general] " Andrew Morton
2008-02-18 12:17 ` Andrea Arcangeli
2008-02-18 12:17 ` Andrea Arcangeli
2008-02-16 11:51 ` Robin Holt
2008-02-16 11:51 ` Robin Holt
2008-02-16 11:51 ` [ofa-general] " Robin Holt
2008-02-18 12:35 ` Andrea Arcangeli
2008-02-18 12:35 ` Andrea Arcangeli
2008-02-18 12:35 ` Andrea Arcangeli
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