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

!MAILaRCHIVE_VOTE_RePLACE
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To: Linus Torvalds <torvalds@...>
Cc: Andrew Morton <akpm@...>, Christoph Lameter <clameter@...>, Jack Steiner <steiner@...>, Robin Holt <holt@...>, Nick Piggin <npiggin@...>, 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 7, 2008 - 6:58 pm

On Wed, May 07, 2008 at 03:44:24PM -0700, Linus Torvalds wrote:

mmu_notifier_register only runs when windows or linux or macosx
boots. Who could ever care of the msec spent in mm_lock compared to
the time it takes to linux to boot?

What you're proposing is to slowdown AIM and certain benchmarks 20% or
more for all users, just so you save at most 1msec to start a VM.


If you want the global lock I'll do it no problem, I just think it's
obviously inferior solution for 99% of users out there (including kvm
users that will also have to take that lock while kvm userland runs).

In my view the most we should do in this area is to reduce further the
max number of locks to take if max_map_count already isn't enough.
--
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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)