Re: [PATCH 08 of 11] anon-vma-rwsem

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To: Linus Torvalds <torvalds@...>
Cc: Robin Holt <holt@...>, Nick Piggin <npiggin@...>, Nick Piggin <nickpiggin@...>, Andrea Arcangeli <andrea@...>, Andrew Morton <akpm@...>, Christoph Lameter <clameter@...>, Jack Steiner <steiner@...>, Peter Zijlstra <a.p.zijlstra@...>, <kvm-devel@...>, Kanoj Sarcar <kanojsarcar@...>, Roland Dreier <rdreier@...>, Steve Wise <swise@...>, <linux-kernel@...>, Avi Kivity <avi@...>, <linux-mm@...>, <general@...>, Hugh Dickins <hugh@...>, Rusty Russell <rusty@...>, Anthony Liguori <aliguori@...>, Chris Wright <chrisw@...>, Marcelo Tosatti <marcelo@...>, Eric Dumazet <dada1@...>, Paul E. McKenney <paulmck@...>
Date: Wednesday, May 14, 2008 - 12:22 pm

On Wed, May 14, 2008 at 08:18:21AM -0700, Linus Torvalds wrote:

We are in the process of attempting this now.  Unfortunately for SGI,
Christoph is on vacation right now so we have been trying to work it
internally.

We are looking through two possible methods, one we add a callout to the
tlb flush paths for both the mmu_gather and flush_tlb_page locations.
The other we place a specific callout seperate from the gather callouts
in the paths we are concerned with.  We will look at both more carefully
before posting.


In either implementation, not all call paths would require the stall
to ensure data integrity.  Would it be acceptable to always put a
sleepable stall in even if the code path did not require the pages be
unwritable prior to continuing?  If we did that, I would be freed from
having a pool of invalidate threads ready for XPMEM to use for that work.
Maybe there is a better way, but the sleeping requirement we would have
on the threads make most options seem unworkable.


Thanks,
Robin
--
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Messages in current thread:
[PATCH 00 of 11] mmu notifier #v16, Andrea Arcangeli, (Wed May 7, 10:35 am)
[PATCH 10 of 11] export zap_page_range for XPMEM, Andrea Arcangeli, (Wed May 7, 10:36 am)
[PATCH 11 of 11] mmap sems, Andrea Arcangeli, (Wed May 7, 10:36 am)
[PATCH 09 of 11] mm_lock-rwsem, Andrea Arcangeli, (Wed May 7, 10:35 am)
[PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 10:35 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 4:56 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 5:26 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Jack Steiner, (Wed May 7, 6:42 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 5:36 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Wed May 7, 8:38 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Nick Piggin, (Tue May 13, 8:06 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Tue May 13, 11:32 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Nick Piggin, (Wed May 14, 12:11 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Wed May 14, 7:26 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Nick Piggin, (Thu May 15, 3:57 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Christoph Lameter, (Thu May 15, 1:33 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Nick Piggin, (Thu May 15, 7:52 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Fri May 16, 7:23 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Fri May 16, 7:50 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Nick Piggin, (Tue May 20, 1:31 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Tue May 20, 6:01 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Nick Piggin, (Tue May 20, 6:50 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Tue May 20, 7:05 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Nick Piggin, (Tue May 20, 7:14 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Tue May 20, 7:26 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Thu May 15, 7:01 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Avi Kivity, (Thu May 15, 7:12 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 14, 11:18 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Christoph Lameter, (Wed May 14, 1:57 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 14, 2:27 pm)
mm notifier: Notifications when pages are unmapped., Christoph Lameter, (Fri May 16, 9:38 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Wed May 14, 12:22 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 14, 12:56 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 8:55 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 6:22 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 6:44 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 6:58 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 7:09 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 7:02 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrew Morton, (Wed May 7, 6:31 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 6:44 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Benjamin Herrenschmidt, (Wed May 7, 7:28 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 7:45 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 9:34 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Nick Piggin, (Tue May 13, 8:14 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Benjamin Herrenschmidt, (Wed May 14, 1:43 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Jack Steiner, (Wed May 14, 9:15 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Nick Piggin, (Wed May 14, 2:06 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrew Morton, (Wed May 7, 6:59 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 7:39 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 9:02 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 9:26 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Christoph Lameter, (Wed May 7, 9:12 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 10:56 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Christoph Lameter, (Wed May 7, 11:10 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 11:41 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Thu May 8, 12:14 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Thu May 8, 1:20 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Thu May 8, 11:03 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Thu May 8, 12:11 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Peter Zijlstra, (Fri May 9, 2:37 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Fri May 9, 2:55 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Peter Zijlstra, (Fri May 9, 3:04 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Thu May 8, 6:01 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Pekka Enberg, (Thu May 8, 1:27 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Pekka Enberg, (Thu May 8, 1:30 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Thu May 8, 1:49 am)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 9:32 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 7:19 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Christoph Lameter, (Wed May 7, 7:39 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 8:03 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Christoph Lameter, (Wed May 7, 8:56 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 9:39 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 9:52 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 9:57 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Andrea Arcangeli, (Wed May 7, 10:24 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 10:32 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Linus Torvalds, (Wed May 7, 9:07 pm)
Re: [PATCH 08 of 11] anon-vma-rwsem, Robin Holt, (Wed May 7, 8:52 pm)
[PATCH 07 of 11] i_mmap_rwsem, Andrea Arcangeli, (Wed May 7, 10:35 am)
[PATCH 06 of 11] rwsem contended, Andrea Arcangeli, (Wed May 7, 10:35 am)
[PATCH 05 of 11] unmap vmas tlb flushing, Andrea Arcangeli, (Wed May 7, 10:35 am)
Re: [PATCH 05 of 11] unmap vmas tlb flushing, Rik van Riel, (Wed May 7, 1:46 pm)
[PATCH 04 of 11] free-pgtables, Andrea Arcangeli, (Wed May 7, 10:35 am)
Re: [PATCH 04 of 11] free-pgtables, Rik van Riel, (Wed May 7, 1:41 pm)
[PATCH 03 of 11] invalidate_page outside PT lock, Andrea Arcangeli, (Wed May 7, 10:35 am)
Re: [PATCH 03 of 11] invalidate_page outside PT lock, Rik van Riel, (Wed May 7, 1:39 pm)
Re: [PATCH 03 of 11] invalidate_page outside PT lock, Andrea Arcangeli, (Wed May 7, 1:57 pm)
[PATCH 01 of 11] mmu-notifier-core, Andrea Arcangeli, (Wed May 7, 10:35 am)
Re: [PATCH 01 of 11] mmu-notifier-core, Andrew Morton, (Wed May 7, 4:05 pm)
Re: [PATCH 01 of 11] mmu-notifier-core, Linus Torvalds, (Wed May 7, 4:30 pm)
Re: [PATCH 01 of 11] mmu-notifier-core, Andrea Arcangeli, (Wed May 7, 5:58 pm)
Re: [PATCH 01 of 11] mmu-notifier-core, Linus Torvalds, (Wed May 7, 6:11 pm)
Re: [PATCH 01 of 11] mmu-notifier-core, Andrea Arcangeli, (Wed May 7, 6:27 pm)
Re: [PATCH 01 of 11] mmu-notifier-core, Linus Torvalds, (Wed May 7, 7:00 pm)
Re: [PATCH 01 of 11] mmu-notifier-core, Andrea Arcangeli, (Wed May 7, 6:37 pm)
Re: [PATCH 01 of 11] mmu-notifier-core, Linus Torvalds, (Wed May 7, 7:38 pm)
Re: [ofa-general] Re: [PATCH 01 of 11] mmu-notifier-core, Andrea Arcangeli, (Wed May 7, 6:39 pm)
Re: [ofa-general] Re: [PATCH 01 of 11] mmu-notifier-core, Linus Torvalds, (Wed May 7, 7:03 pm)
Re: [PATCH 01 of 11] mmu-notifier-core, Andrew Morton, (Wed May 7, 4:02 pm)
Re: [PATCH 01 of 11] mmu-notifier-core, Rik van Riel, (Wed May 7, 1:35 pm)
[PATCH 02 of 11] get_task_mm, Andrea Arcangeli, (Wed May 7, 10:35 am)
Re: [PATCH 02 of 11] get_task_mm, Robin Holt, (Wed May 7, 11:59 am)
Re: [PATCH 02 of 11] get_task_mm, Andrea Arcangeli, (Wed May 7, 12:20 pm)