From: Robin Holt <holt@sgi.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Robin Holt <holt@sgi.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrea Arcangeli <andrea@qumranet.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Lameter <clameter@sgi.com>,
Jack Steiner <steiner@sgi.com>, Nick Piggin <npiggin@suse.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
kvm-devel@lists.sourceforge.net,
Kanoj Sarcar <kanojsarcar@yahoo.com>,
Roland Dreier <rdreier@cisco.com>,
Steve Wise <swise@opengridcomputing.com>,
linux-kernel@vger.kernel.org, Avi Kivity <avi@qumranet.com>,
linux-mm@kvack.org, general@lists.openfabrics.org,
Hugh Dickins <hugh@veritas.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Anthony Liguori <aliguori@us.ibm.com>,
Chris Wright <chrisw@redhat.com>,
Marcelo Tosatti <marcelo@kvack.org>,
Eric Dumazet <dada1@cosmosbay.com>,
"Paul E. McKenney" <paulmck@us.ibm.com>
Subject: Re: [PATCH 08 of 11] anon-vma-rwsem
Date: Tue, 13 May 2008 10:32:38 -0500 [thread overview]
Message-ID: <20080513153238.GL19717@sgi.com> (raw)
In-Reply-To: <200805132206.47655.nickpiggin@yahoo.com.au>
On Tue, May 13, 2008 at 10:06:44PM +1000, Nick Piggin wrote:
> On Thursday 08 May 2008 10:38, Robin Holt wrote:
> > In order to invalidate the remote page table entries, we need to message
> > (uses XPC) to the remote side. The remote side needs to acquire the
> > importing process's mmap_sem and call zap_page_range(). Between the
> > messaging and the acquiring a sleeping lock, I would argue this will
> > require sleeping locks in the path prior to the mmu_notifier invalidate_*
> > callouts().
>
> Why do you need to take mmap_sem in order to shoot down pagetables of
> the process? It would be nice if this can just be done without
> sleeping.
We are trying to shoot down page tables of a different process running
on a different instance of Linux running on Numa-link connected portions
of the same machine.
The messaging is clearly going to require sleeping. Are you suggesting
we need to rework XPC communications to not require sleeping? I think
that is going to be impossible since the transfer engine requires a
sleeping context.
Additionally, the call to zap_page_range expects to have the mmap_sem
held. I suppose we could use something other than zap_page_range and
atomically clear the process page tables. Doing that will not alleviate
the need to sleep for the messaging to the other partitions.
Thanks,
Robin
next prev parent reply other threads:[~2008-05-13 15:32 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-07 14:35 [PATCH 00 of 11] mmu notifier #v16 Andrea Arcangeli
2008-05-07 14:35 ` [PATCH 01 of 11] mmu-notifier-core Andrea Arcangeli
2008-05-07 17:35 ` Rik van Riel
2008-05-07 20:02 ` Andrew Morton
2008-05-07 20:05 ` Andrew Morton
2008-05-07 20:30 ` Linus Torvalds
2008-05-07 21:58 ` Andrea Arcangeli
2008-05-07 22:11 ` Linus Torvalds
2008-05-07 22:27 ` Andrea Arcangeli
2008-05-07 22:31 ` [ofa-general] " Roland Dreier
2008-05-07 22:39 ` Andrea Arcangeli
2008-05-07 23:03 ` Linus Torvalds
2008-05-07 22:37 ` Andrea Arcangeli
2008-05-07 23:38 ` Linus Torvalds
2008-05-07 23:00 ` Linus Torvalds
2008-05-07 14:35 ` [PATCH 02 of 11] get_task_mm Andrea Arcangeli
2008-05-07 15:59 ` Robin Holt
2008-05-07 16:20 ` Andrea Arcangeli
2008-05-07 14:35 ` [PATCH 03 of 11] invalidate_page outside PT lock Andrea Arcangeli
2008-05-07 17:39 ` Rik van Riel
2008-05-07 17:57 ` Andrea Arcangeli
2008-05-07 14:35 ` [PATCH 04 of 11] free-pgtables Andrea Arcangeli
2008-05-07 17:41 ` Rik van Riel
2008-05-07 14:35 ` [PATCH 05 of 11] unmap vmas tlb flushing Andrea Arcangeli
2008-05-07 17:46 ` Rik van Riel
2008-05-07 14:35 ` [PATCH 06 of 11] rwsem contended Andrea Arcangeli
2008-05-07 14:35 ` [PATCH 07 of 11] i_mmap_rwsem Andrea Arcangeli
2008-05-07 14:35 ` [PATCH 08 of 11] anon-vma-rwsem Andrea Arcangeli
2008-05-07 20:56 ` Linus Torvalds
2008-05-07 21:26 ` Andrea Arcangeli
2008-05-07 21:36 ` Linus Torvalds
2008-05-07 22:22 ` Andrea Arcangeli
2008-05-07 22:31 ` Andrew Morton
2008-05-07 22:44 ` Andrea Arcangeli
2008-05-07 22:59 ` Andrew Morton
2008-05-07 23:19 ` Linus Torvalds
2008-05-07 23:39 ` Christoph Lameter
2008-05-08 0:03 ` Linus Torvalds
2008-05-08 0:52 ` Robin Holt
2008-05-08 0:56 ` Christoph Lameter
2008-05-08 1:07 ` Linus Torvalds
2008-05-08 1:39 ` Linus Torvalds
2008-05-08 1:52 ` Andrea Arcangeli
2008-05-08 1:57 ` Linus Torvalds
2008-05-08 2:24 ` Andrea Arcangeli
2008-05-08 2:32 ` Linus Torvalds
2008-05-07 23:39 ` Andrea Arcangeli
2008-05-08 1:02 ` Linus Torvalds
2008-05-08 1:12 ` Christoph Lameter
2008-05-08 1:32 ` Linus Torvalds
2008-05-08 2:56 ` Andrea Arcangeli
2008-05-08 3:10 ` Christoph Lameter
2008-05-08 3:41 ` Andrea Arcangeli
2008-05-08 4:14 ` Linus Torvalds
2008-05-08 5:20 ` Andrea Arcangeli
2008-05-08 5:27 ` Pekka Enberg
2008-05-08 5:30 ` Pekka Enberg
2008-05-08 5:49 ` Andrea Arcangeli
2008-05-08 15:03 ` Linus Torvalds
2008-05-08 16:11 ` Linus Torvalds
2008-05-08 22:01 ` Andrea Arcangeli
2008-05-09 18:37 ` Peter Zijlstra
2008-05-09 18:55 ` Andrea Arcangeli
2008-05-09 19:04 ` Peter Zijlstra
2008-05-08 1:26 ` Andrea Arcangeli
2008-05-07 23:28 ` Benjamin Herrenschmidt
2008-05-07 23:45 ` Andrea Arcangeli
2008-05-08 1:34 ` Andrea Arcangeli
2008-05-13 12:14 ` Nick Piggin
2008-05-14 5:43 ` Benjamin Herrenschmidt
2008-05-14 6:06 ` Nick Piggin
2008-05-14 13:15 ` Jack Steiner
2008-05-07 22:44 ` Linus Torvalds
2008-05-07 22:58 ` Andrea Arcangeli
2008-05-07 23:02 ` Andrea Arcangeli
2008-05-07 23:09 ` Linus Torvalds
2008-05-08 0:38 ` Robin Holt
2008-05-08 0:55 ` Linus Torvalds
2008-05-13 12:06 ` Nick Piggin
2008-05-13 15:32 ` Robin Holt [this message]
2008-05-14 4:11 ` Nick Piggin
2008-05-14 11:26 ` Robin Holt
2008-05-14 15:18 ` Linus Torvalds
2008-05-14 16:22 ` Robin Holt
2008-05-14 16:56 ` Linus Torvalds
2008-05-14 17:57 ` Christoph Lameter
2008-05-14 18:27 ` Linus Torvalds
2008-05-17 1:38 ` mm notifier: Notifications when pages are unmapped Christoph Lameter
2008-05-15 7:57 ` [PATCH 08 of 11] anon-vma-rwsem Nick Piggin
2008-05-15 11:01 ` Robin Holt
2008-05-15 11:12 ` Avi Kivity
2008-05-15 17:33 ` Christoph Lameter
2008-05-15 23:52 ` Nick Piggin
2008-05-16 11:23 ` Robin Holt
2008-05-16 11:50 ` Robin Holt
2008-05-20 5:31 ` Nick Piggin
2008-05-20 10:01 ` Robin Holt
2008-05-20 10:50 ` Nick Piggin
2008-05-20 11:05 ` Robin Holt
2008-05-20 11:14 ` Nick Piggin
2008-05-20 11:26 ` Robin Holt
2008-05-07 22:42 ` Jack Steiner
2008-05-07 14:35 ` [PATCH 09 of 11] mm_lock-rwsem Andrea Arcangeli
2008-05-07 14:36 ` [PATCH 10 of 11] export zap_page_range for XPMEM Andrea Arcangeli
2008-05-07 14:36 ` [PATCH 11 of 11] mmap sems Andrea Arcangeli
-- strict thread matches above, loose matches on Subject: below --
2008-05-02 15:05 [PATCH 00 of 11] mmu notifier #v15 Andrea Arcangeli
2008-05-02 15:05 ` [PATCH 08 of 11] anon-vma-rwsem Andrea Arcangeli
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