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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Robin Holt <holt@sgi.com>
Cc: Andrea Arcangeli <andrea@qumranet.com>,
	Christoph Lameter <clameter@sgi.com>,
	akpm@linux-foundation.org, Avi Kivity <avi@qumranet.com>,
	Izik Eidus <izike@qumranet.com>,
	kvm-devel@lists.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	general@lists.openfabrics.org,
	Steve Wise <swise@opengridcomputing.com>,
	Roland Dreier <rdreier@cisco.com>,
	Kanoj Sarcar <kanojsarcar@yahoo.com>,
	steiner@sgi.com, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, daniel.blueman@quadrics.com
Subject: Re: [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges
Date: Wed, 20 Feb 2008 14:11:41 +1100	[thread overview]
Message-ID: <200802201411.42360.nickpiggin@yahoo.com.au> (raw)
In-Reply-To: <20080220030031.GC11364@sgi.com>

On Wednesday 20 February 2008 14:00, Robin Holt wrote:
> On Wed, Feb 20, 2008 at 02:00:38AM +0100, Andrea Arcangeli wrote:
> > On Wed, Feb 20, 2008 at 10:08:49AM +1100, Nick Piggin wrote:

> > > Also, how to you resolve the case where you are not allowed to sleep?
> > > I would have thought either you have to handle it, in which case nobody
> > > needs to sleep; or you can't handle it, in which case the code is
> > > broken.
> >
> > I also asked exactly this, glad you reasked this too.
>
> Currently, we BUG_ON having a PFN in our tables and not being able
> to sleep.  These are mappings which MPT has never supported in the past
> and XPMEM was already not allowing page faults for VMAs which are not
> anonymous so it should never happen.  If the file-backed operations can
> ever get changed to allow for sleeping and a customer has a need for it,
> we would need to change XPMEM to allow those types of faults to succeed.

Do you really want to be able to swap, or are you just interested
in keeping track of unmaps / prot changes?


  reply	other threads:[~2008-02-20  3:14 UTC|newest]

Thread overview: 129+ 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  6:49 ` [patch 1/6] mmu_notifier: Core code Christoph Lameter
2008-02-16  3:37   ` Andrew Morton
2008-02-16  8:45     ` Avi Kivity
2008-02-16  8:56       ` Andrew Morton
2008-02-16  9:21         ` Avi Kivity
2008-02-16 10:41     ` Brice Goglin
2008-02-16 10:58       ` Andrew Morton
2008-02-16 19:31         ` Christoph Lameter
2008-02-16 19:21     ` Christoph Lameter
2008-02-17  3:01       ` Andrea Arcangeli
2008-02-17 12:24         ` Robin Holt
2008-02-17  5:04     ` Doug Maxey
2008-02-18 22:33   ` Roland Dreier
2008-02-15  6:49 ` [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-02-16  3:37   ` Andrew Morton
2008-02-16 19:26     ` Christoph Lameter
2008-02-19  8:54   ` Nick Piggin
2008-02-19 13:34     ` Andrea Arcangeli
2008-02-27 22:23       ` Christoph Lameter
2008-02-27 23:57         ` Andrea Arcangeli
2008-02-19 23:08   ` Nick Piggin
2008-02-20  1:00     ` Andrea Arcangeli
2008-02-20  3:00       ` Robin Holt
2008-02-20  3:11         ` Nick Piggin [this message]
2008-02-20  3:19           ` Robin Holt
2008-02-27 22:39       ` Christoph Lameter
2008-02-28  0:38         ` Andrea Arcangeli
2008-02-27 22:35     ` Christoph Lameter
2008-02-27 22:42       ` Jack Steiner
2008-02-28  0:10       ` Christoph Lameter
2008-02-28  0:11       ` Andrea Arcangeli
2008-02-28  0:14         ` Christoph Lameter
2008-02-28  0:52           ` Andrea Arcangeli
2008-02-28  1:03             ` Christoph Lameter
2008-02-28  1:10               ` Andrea Arcangeli
2008-02-28 18:43                 ` Christoph Lameter
2008-02-29  0:55                   ` Andrea Arcangeli
2008-02-29  0:59                     ` Christoph Lameter
2008-02-29 13:13                       ` Andrea Arcangeli
2008-02-29 19:55                         ` Christoph Lameter
2008-02-29 20:17                           ` Andrea Arcangeli
2008-02-29 21:03                             ` Christoph Lameter
2008-02-29 21:23                               ` Andrea Arcangeli
2008-02-29 21:29                                 ` Christoph Lameter
2008-02-29 21:34                                 ` Christoph Lameter
2008-02-29 21:48                                   ` Andrea Arcangeli
2008-02-29 22:12                                     ` Christoph Lameter
2008-02-29 22:41                                       ` Andrea Arcangeli
2008-02-28 10:53             ` Robin Holt
2008-03-03  5:11       ` Nick Piggin
2008-03-03 19:28         ` Christoph Lameter
2008-03-03 19:50           ` Nick Piggin
2008-03-04 18:58             ` Christoph Lameter
2008-03-05  0:52               ` Nick Piggin
2008-02-15  6:49 ` [patch 3/6] mmu_notifier: invalidate_page callbacks Christoph Lameter
2008-02-16  3:37   ` Andrew Morton
2008-02-16 11:07     ` Andrea Arcangeli
2008-02-16 19:22     ` Christoph Lameter
2008-02-16 19:54       ` Avi Kivity
2008-02-19  8:46       ` Nick Piggin
2008-02-19 13:30         ` Andrea Arcangeli
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 ` [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem) Christoph Lameter
2008-02-16  3:37   ` Andrew Morton
2008-02-16 19:28     ` Christoph Lameter
2008-02-19 23:55   ` Nick Piggin
2008-02-20  3:12     ` Robin Holt
2008-02-20  3:51       ` Nick Piggin
2008-02-20  9:00         ` Robin Holt
2008-02-20  9:05           ` Robin Holt
2008-02-21  4:20           ` Nick Piggin
2008-02-21 10:58             ` Robin Holt
2008-02-26  6:11               ` Nick Piggin
2008-02-26  7:21                 ` [ofa-general] " Gleb Natapov
2008-02-26  8:52                   ` Nick Piggin
2008-02-26  9:38                     ` Gleb Natapov
2008-02-26  9:52                       ` KOSAKI Motohiro
2008-02-26 12:28                     ` Robin Holt
2008-02-26 12:29                 ` Robin Holt
2008-02-27 22:43     ` Christoph Lameter
2008-02-28  0:42       ` Andrea Arcangeli
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
2008-02-16 10:48 ` [PATCH] KVM swapping with MMU Notifiers V7 Andrea Arcangeli
2008-02-16 11:08   ` Andrew Morton
2008-02-18 12:17     ` Andrea Arcangeli
2008-02-16 11:51   ` Robin Holt
2008-02-18 12:35     ` Andrea Arcangeli
  -- strict thread matches above, loose matches on Subject: below --
2008-02-08 22:06 [patch 0/6] MMU Notifiers V6 Christoph Lameter
2008-02-08 22:06 ` [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-01-30  2:29 [patch 0/6] [RFC] MMU Notifiers V3 Christoph Lameter
2008-01-30  2:29 ` [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-01-28 20:28 [patch 0/6] [RFC] MMU Notifiers V2 Christoph Lameter
2008-01-28 20:28 ` [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-01-29 16:20   ` Andrea Arcangeli
2008-01-29 18:28     ` Andrea Arcangeli
2008-01-29 20:30       ` Christoph Lameter
2008-01-29 21:36         ` Andrea Arcangeli
2008-01-29 21:53           ` Christoph Lameter
2008-01-29 22:35             ` Andrea Arcangeli
2008-01-29 22:55               ` Christoph Lameter
2008-01-29 23:43                 ` Andrea Arcangeli
2008-01-30  0:34                   ` Christoph Lameter
2008-01-29 19:55     ` Christoph Lameter
2008-01-29 21:17       ` Andrea Arcangeli
2008-01-29 21:35         ` Christoph Lameter
2008-01-29 22:02           ` Andrea Arcangeli
2008-01-29 22:39             ` Christoph Lameter
2008-01-30  0:00               ` Andrea Arcangeli
2008-01-30  0:05                 ` Andrea Arcangeli
2008-01-30  0:22                   ` Christoph Lameter
2008-01-30  0:59                     ` Andrea Arcangeli
2008-01-30  8:26                       ` Peter Zijlstra
2008-01-30  0:20                 ` Christoph Lameter
2008-01-30  0:28                   ` Jack Steiner
2008-01-30  0:35                     ` Christoph Lameter
2008-01-30 13:37                     ` Andrea Arcangeli
2008-01-30 14:43                       ` Jack Steiner
2008-01-30 19:41                         ` Christoph Lameter
2008-01-30 20:29                           ` Jack Steiner
2008-01-30 20:55                             ` Christoph Lameter
2008-01-30 16:11                 ` Robin Holt
2008-01-30 17:04                   ` Andrea Arcangeli
2008-01-30 17:30                     ` Robin Holt
2008-01-30 18:25                       ` Andrea Arcangeli
2008-01-30 19:50                         ` Christoph Lameter
2008-01-30 22:18                           ` Robin Holt
2008-01-30 23:52                           ` Andrea Arcangeli
2008-01-31  0:01                             ` Christoph Lameter
2008-01-30 19:35                   ` Christoph Lameter

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