From: Steve Wise <swise@opengridcomputing.com>
To: Felix Marti <felix@chelsio.com>
Cc: Roland Dreier <rdreier@cisco.com>,
Christoph Lameter <clameter@sgi.com>,
Rik van Riel <riel@redhat.com>,
steiner@sgi.com, Andrea Arcangeli <andrea@qumranet.com>,
a.p.zijlstra@chello.nl, izike@qumranet.com,
linux-kernel@vger.kernel.org, avi@qumranet.com,
linux-mm@kvack.org, daniel.blueman@quadrics.com,
Robin Holt <holt@sgi.com>,
general@lists.openfabrics.org,
Andrew Morton <akpm@linux-foundation.org>,
kvm-devel@lists.sourceforge.net
Subject: Re: [ofa-general] Re: Demand paging for memory regions
Date: Thu, 14 Feb 2008 09:09:08 -0600 [thread overview]
Message-ID: <47B45994.7010805@opengridcomputing.com> (raw)
In-Reply-To: <8A71B368A89016469F72CD08050AD334026D5C23@maui.asicdesigners.com>
Felix Marti wrote:
>
> That is correct, not a change we can make for T3. We could, in theory,
> deal with changing mappings though. The change would need to be
> synchronized though: the VM would need to tell us which mapping were
> about to change and the driver would then need to disable DMA to/from
> it, do the change and resume DMA.
>
Note that for T3, this involves suspending _all_ rdma connections that
are in the same PD as the MR being remapped. This is because the driver
doesn't know who the application advertised the rkey/stag to. So
without that knowledge, all connections that _might_ rdma into the MR
must be suspended. If the MR was only setup for local access, then the
driver could track the connections with references to the MR and only
quiesce those connections.
Point being, it will stop probably all connections that an application
is using (assuming the application uses a single PD).
Steve.
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next prev parent reply other threads:[~2008-02-14 15:09 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-08 22:06 [patch 0/6] MMU Notifiers V6 Christoph Lameter
2008-02-08 22:06 ` [patch 1/6] mmu_notifier: Core code Christoph Lameter
2008-02-08 22:06 ` [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-02-08 22:06 ` [patch 3/6] mmu_notifier: invalidate_page callbacks Christoph Lameter
2008-02-08 22:06 ` [patch 4/6] mmu_notifier: Skeleton driver for a simple mmu_notifier Christoph Lameter
2008-02-08 22:06 ` [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem) Christoph Lameter
2008-02-08 22:06 ` [patch 6/6] mmu_rmap_notifier: Skeleton for complex driver that uses its own rmaps Christoph Lameter
2008-02-08 22:23 ` [patch 0/6] MMU Notifiers V6 Andrew Morton
2008-02-08 23:32 ` Christoph Lameter
2008-02-08 23:36 ` Robin Holt
2008-02-08 23:41 ` Christoph Lameter
2008-02-08 23:43 ` Robin Holt
2008-02-08 23:56 ` Andrew Morton
2008-02-09 0:05 ` Christoph Lameter
2008-02-09 0:12 ` [ofa-general] " Roland Dreier
2008-02-09 0:16 ` Christoph Lameter
2008-02-09 0:21 ` [ofa-general] trying to get of all lists R S
2008-02-09 0:22 ` [ofa-general] Re: [patch 0/6] MMU Notifiers V6 Roland Dreier
2008-02-09 0:36 ` Christoph Lameter
2008-02-09 1:24 ` Andrea Arcangeli
2008-02-09 1:27 ` Christoph Lameter
2008-02-09 1:56 ` Andrea Arcangeli
2008-02-09 2:16 ` Christoph Lameter
2008-02-09 12:55 ` Rik van Riel
2008-02-09 21:46 ` Christoph Lameter
2008-02-11 22:40 ` Demand paging for memory regions (was Re: MMU Notifiers V6) Roland Dreier
2008-02-12 22:01 ` Steve Wise
2008-02-12 22:10 ` Christoph Lameter
2008-02-12 22:41 ` [ofa-general] Re: Demand paging for memory regions Roland Dreier
2008-02-12 23:14 ` Felix Marti
2008-02-13 0:57 ` Christoph Lameter
2008-02-14 15:09 ` Steve Wise [this message]
2008-02-14 15:53 ` Robin Holt
2008-02-14 16:23 ` Steve Wise
2008-02-14 17:48 ` Caitlin Bestler
2008-02-14 20:47 ` David Singleton
2008-02-15 9:55 ` Robin Holt
2008-02-14 19:39 ` Christoph Lameter
2008-02-14 20:17 ` Caitlin Bestler
2008-02-14 20:20 ` Christoph Lameter
2008-02-14 22:43 ` Caitlin Bestler
2008-02-14 22:48 ` Christoph Lameter
2008-02-15 1:26 ` Caitlin Bestler
2008-02-15 2:37 ` Christoph Lameter
2008-02-15 18:09 ` Caitlin Bestler
2008-02-15 18:45 ` Christoph Lameter
2008-02-15 18:53 ` Caitlin Bestler
2008-02-15 20:02 ` Christoph Lameter
2008-02-15 20:14 ` Caitlin Bestler
2008-02-15 22:50 ` Christoph Lameter
2008-02-15 23:50 ` Caitlin Bestler
2008-02-12 23:23 ` Jason Gunthorpe
2008-02-13 1:01 ` Christoph Lameter
2008-02-13 1:26 ` Jason Gunthorpe
2008-02-13 1:45 ` Steve Wise
2008-02-13 2:35 ` Christoph Lameter
2008-02-13 3:25 ` Jason Gunthorpe
2008-02-13 3:56 ` Patrick Geoffray
2008-02-13 4:26 ` Jason Gunthorpe
2008-02-13 4:47 ` Patrick Geoffray
2008-02-13 18:51 ` Christoph Lameter
2008-02-13 19:51 ` Jason Gunthorpe
2008-02-13 20:36 ` Christoph Lameter
2008-02-13 4:09 ` Christian Bell
2008-02-13 19:00 ` Christoph Lameter
2008-02-13 19:46 ` Christian Bell
2008-02-13 20:32 ` Christoph Lameter
2008-02-13 22:44 ` Kanoj Sarcar
2008-02-13 23:02 ` Christoph Lameter
2008-02-13 23:43 ` Kanoj Sarcar
2008-02-13 23:48 ` Jesse Barnes
2008-02-14 0:56 ` [ofa-general] " Andrea Arcangeli
2008-02-14 19:35 ` Christoph Lameter
2008-02-13 23:23 ` Pete Wyckoff
2008-02-14 0:01 ` Jason Gunthorpe
2008-02-27 22:11 ` Christoph Lameter
2008-02-13 1:55 ` Christian Bell
2008-02-13 2:19 ` Christoph Lameter
2008-02-13 0:56 ` Christoph Lameter
2008-02-13 12:11 ` Christoph Raisch
2008-02-13 19:02 ` Christoph Lameter
2008-02-09 0:12 ` [patch 0/6] MMU Notifiers V6 Andrew Morton
2008-02-09 0:18 ` Christoph Lameter
2008-02-13 14:31 ` Jack Steiner
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