Re: [RFC] Notifier for Externally Mapped Memory (EMM)

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To: Peter Zijlstra <a.p.zijlstra@...>

Cc: Christoph Lameter <clameter@...>, Andrea Arcangeli <andrea@...>, Jack Steiner <steiner@...>, Nick Piggin <npiggin@...>, <akpm@...>, Robin Holt <holt@...>, <kvm-devel@...>, <general@...>, Steve Wise <swise@...>, Roland Dreier <rdreier@...>, Kanoj Sarcar <kanojsarcar@...>, <linux-kernel@...>, <linux-mm@...>, <daniel.blueman@...>

Subject: Re: [RFC] Notifier for Externally Mapped Memory (EMM)

Date: Wednesday, March 5, 2008 - 1:09 am

Peter Zijlstra wrote:
quoted text> On Tue, 2008-03-04 at 14:35 -0800, Christoph Lameter wrote:
>
>   
>> RCU means that the callbacks occur in an atomic context.
>>     
>
> Not really, if it requires moving the VM locks to sleepable locks under
> a .config option, I think its also fair to require PREEMPT_RCU.
>
> OTOH, if you want to unconditionally move the VM locks to sleepable
> locks you have a point.
>   

Isn't that out of the question for .25?

I really wish we can get the atomic variant in now, and add on 
sleepability in .26, updating users if necessary.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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Messages in current thread:

[patch] my mmu notifiers, Nick Piggin, (Tue Feb 19, 4:43 am)

Re: [patch] my mmu notifiers, Andrea Arcangeli, (Tue Feb 19, 9:58 am)

Re: [patch] my mmu notifiers, Nick Piggin, (Tue Feb 19, 7:11 pm)

Re: [patch] my mmu notifiers, Christoph Lameter, (Wed Feb 27, 6:56 pm)

Re: [patch] my mmu notifiers, Robin Holt, (Tue Feb 19, 10:49 pm)

Re: [patch] my mmu notifiers, Andrea Arcangeli, (Tue Feb 19, 9:09 pm)

Re: [patch] my mmu notifiers, Nick Piggin, (Thu Feb 21, 12:47 am)

[PATCH] mmu notifiers #v6, Andrea Arcangeli, (Wed Feb 20, 6:39 am)

Re: [PATCH] mmu notifiers #v6, Nick Piggin, (Thu Feb 21, 12:54 am)

Re: [PATCH] mmu notifiers #v6, Andrea Arcangeli, (Thu Feb 21, 10:40 am)

Re: [PATCH] mmu notifiers #v6, Jack Steiner, (Thu Feb 21, 12:10 pm)

[PATCH] mmu notifiers #v7, Andrea Arcangeli, (Wed Feb 27, 3:26 pm)

[PATCH] mmu notifiers #v8, Andrea Arcangeli, (Sun Mar 2, 11:54 am)

[PATCH] mmu notifiers #v9, Andrea Arcangeli, (Mon Mar 3, 5:37 pm)

[PATCH] KVM swapping with mmu notifiers #v9, Andrea Arcangeli, (Mon Mar 3, 6:05 pm)

Re: [PATCH] KVM swapping with mmu notifiers #v9, izik eidus, (Mon Mar 3, 8:44 pm)

Re: [PATCH] KVM swapping with mmu notifiers #v9, Andrea Arcangeli, (Tue Mar 4, 9:21 am)

[RFC] Notifier for Externally Mapped Memory (EMM), Christoph Lameter, (Tue Mar 4, 3:31 am)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Andrea Arcangeli, (Tue Mar 4, 9:30 am)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Christoph Lameter, (Tue Mar 4, 3:00 pm)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Andrea Arcangeli, (Tue Mar 4, 6:20 pm)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Christoph Lameter, (Tue Mar 4, 6:35 pm)

[PATCH] 2/4 move all invalidate_page outside of PT lock (#v9..., Andrea Arcangeli, (Fri Mar 7, 11:17 am)

Re: [PATCH] 2/4 move all invalidate_page outside of PT lock ..., Christoph Lameter, (Fri Mar 7, 3:54 pm)

Re: [PATCH] 3/4 combine RCU with seqlock to allow mmu notifi..., Andrea Arcangeli, (Fri Mar 7, 11:23 am)

Re: [PATCH] 3/4 combine RCU with seqlock to allow mmu notifi..., Christoph Lameter, (Fri Mar 7, 4:00 pm)

Re: [PATCH] 3/4 combine RCU with seqlock to allow mmu notifi..., Peter Zijlstra, (Fri Mar 7, 12:52 pm)

Re: [PATCH] 3/4 combine RCU with seqlock to allow mmu notifi..., Andrea Arcangeli, (Fri Mar 7, 1:50 pm)

Re: [PATCH] 3/4 combine RCU with seqlock to allow mmu notifi..., Christoph Lameter, (Fri Mar 7, 4:10 pm)

Re: [PATCH] 3/4 combine RCU with seqlock to allow mmu notifi..., Peter Zijlstra, (Fri Mar 7, 2:01 pm)

Re: [PATCH] 3/4 combine RCU with seqlock to allow mmu notifi..., Andrea Arcangeli, (Fri Mar 7, 2:45 pm)

Re: [PATCH] 3/4 combine RCU with seqlock to allow mmu notifi..., Christoph Lameter, (Fri Mar 7, 4:12 pm)

Re: [PATCH] 3/4 combine RCU with seqlock to allow mmu notifi..., Andrea Arcangeli, (Fri Mar 7, 3:47 pm)

Re: [PATCH] 3/4 combine RCU with seqlock to allow mmu notifi..., Christoph Lameter, (Fri Mar 7, 4:15 pm)

[PATCH] 4/4 i_mmap_lock spinlock2rwsem (#v9 was 1/4), Andrea Arcangeli, (Fri Mar 7, 11:52 am)

Re: [PATCH] 4/4 i_mmap_lock spinlock2rwsem (#v9 was 1/4), Christoph Lameter, (Wed Mar 19, 5:27 pm)

Re: [PATCH] 4/4 i_mmap_lock spinlock2rwsem (#v9 was 1/4), Christoph Lameter, (Fri Mar 7, 4:03 pm)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Peter Zijlstra, (Tue Mar 4, 6:42 pm)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Avi Kivity, (Wed Mar 5, 1:09 am)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Robin Holt, (Wed Mar 5, 5:47 am)

Re: [kvm-devel] [RFC] Notifier for Externally Mapped Memory ..., Dor Laor, (Wed Mar 5, 6:02 am)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Avi Kivity, (Wed Mar 5, 5:53 am)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Christoph Lameter, (Tue Mar 4, 7:14 pm)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Peter Zijlstra, (Tue Mar 4, 7:25 pm)

Re: [RFC] Notifier for Externally Mapped Memory (EMM), Peter Zijlstra, (Tue Mar 4, 7:30 pm)

[Early draft] Conversion of i_mmap_lock to semaphore, Christoph Lameter, (Tue Mar 4, 3:34 am)

Re: [PATCH] mmu notifiers #v8, Nick Piggin, (Sun Mar 2, 11:39 pm)

Re: [PATCH] mmu notifiers #v8, Nick Piggin, (Sun Mar 2, 11:34 pm)

Re: [PATCH] mmu notifiers #v8, Christoph Lameter, (Mon Mar 3, 3:04 pm)

Re: [PATCH] mmu notifiers #v8, Nick Piggin, (Sun Mar 2, 11:33 pm)

Re: [PATCH] mmu notifiers #v8, Christoph Lameter, (Mon Mar 3, 3:03 pm)

Re: [PATCH] mmu notifiers #v8, Nick Piggin, (Sun Mar 2, 11:29 pm)

Re: [PATCH] mmu notifiers #v8, Christoph Lameter, (Mon Mar 3, 3:01 pm)

Re: [PATCH] mmu notifiers #v8, Nick Piggin, (Tue Mar 4, 8:37 pm)

Re: [PATCH] mmu notifiers #v8, Christoph Lameter, (Wed Mar 5, 2:48 pm)

Re: [PATCH] mmu notifiers #v8, Nick Piggin, (Wed Mar 5, 10:59 pm)

Re: [PATCH] mmu notifiers #v8, Andrea Arcangeli, (Mon Mar 3, 5:15 pm)

Re: [PATCH] mmu notifiers #v8, Andrea Arcangeli, (Mon Mar 3, 8:51 am)

Re: [PATCH] mmu notifiers #v8, Nick Piggin, (Mon Mar 3, 9:10 am)

Re: [PATCH] mmu notifiers #v8, Jack Steiner, (Mon Mar 3, 11:18 am)

Re: [PATCH] mmu notifiers #v8, Nick Piggin, (Mon Mar 3, 12:59 pm)

Re: [PATCH] mmu notifiers #v8, Christoph Lameter, (Mon Mar 3, 3:02 pm)

Re: [PATCH] mmu notifiers #v8, Jack Steiner, (Mon Mar 3, 2:06 pm)

Re: [PATCH] mmu notifiers #v8, Nick Piggin, (Mon Mar 3, 2:45 pm)

Re: [PATCH] mmu notifiers #v8, Jack Steiner, (Mon Mar 3, 3:15 pm)

Re: [PATCH] mmu notifiers #v8, Peter Zijlstra, (Tue Mar 4, 6:35 am)

Re: [PATCH] mmu notifiers #v8, Jack Steiner, (Tue Mar 4, 10:44 am)

Re: [PATCH] mmu notifiers #v8, Avi Kivity, (Mon Mar 3, 2:09 pm)

Re: [PATCH] mmu notifiers #v8, Jack Steiner, (Mon Mar 3, 2:23 pm)

Re: [PATCH] mmu notifiers #v8, Andrea Arcangeli, (Mon Mar 3, 9:24 am)

Re: [PATCH] mmu notifiers #v8 + xpmem, Andrea Arcangeli, (Sun Mar 2, 12:03 pm)

Re: [PATCH] mmu notifiers #v8 + xpmem, Peter Zijlstra, (Sun Mar 2, 12:23 pm)

Re: [PATCH] mmu notifiers #v7, Christoph Lameter, (Thu Feb 28, 7:05 pm)

Re: [PATCH] mmu notifiers #v7, Andrea Arcangeli, (Thu Feb 28, 8:40 pm)

Re: [PATCH] mmu notifiers #v7, Christoph Lameter, (Thu Feb 28, 9:03 pm)

Re: [PATCH] mmu notifiers #v7, Andrea Arcangeli, (Fri Feb 29, 9:09 am)

Re: [PATCH] mmu notifiers #v7, Christoph Lameter, (Fri Feb 29, 3:46 pm)

Re: [PATCH] mmu notifiers #v7, Andrew Morton, (Thu Feb 28, 8:56 pm)

Re: [PATCH] mmu notifiers #v7, Christoph Lameter, (Thu Feb 28, 3:48 pm)

Re: [PATCH] mmu notifiers #v7, Andrea Arcangeli, (Thu Feb 28, 5:52 pm)

Re: [PATCH] mmu notifiers #v7, Jack Steiner, (Thu Feb 28, 7:17 pm)

Re: [PATCH] mmu notifiers #v7, Andrea Arcangeli, (Thu Feb 28, 8:24 pm)

Re: [PATCH] mmu notifiers #v7, Christoph Lameter, (Thu Feb 28, 9:13 pm)

Re: [PATCH] mmu notifiers #v7, Christoph Lameter, (Thu Feb 28, 6:00 pm)

Re: [PATCH] mmu notifiers #v7, Christoph Lameter, (Wed Feb 27, 7:06 pm)

Re: [kvm-devel] [PATCH] mmu notifiers #v7, Andrea Arcangeli, (Wed Feb 27, 7:43 pm)

Re: [kvm-devel] [PATCH] mmu notifiers #v7, Christoph Lameter, (Wed Feb 27, 8:08 pm)

Re: [kvm-devel] [PATCH] mmu notifiers #v7, Andrea Arcangeli, (Wed Feb 27, 8:21 pm)

Re: [kvm-devel] [PATCH] mmu notifiers #v7, Christoph Lameter, (Wed Feb 27, 8:24 pm)

Re: [PATCH] mmu notifiers #v7, Peter Zijlstra, (Wed Feb 27, 4:04 pm)

Re: [PATCH] mmu notifiers #v6, Jack Steiner, (Wed Feb 20, 5:03 pm)

Re: [PATCH] mmu notifiers #v6, Robin Holt, (Wed Feb 20, 10:41 am)

Re: [PATCH] mmu notifiers #v6, Andrea Arcangeli, (Wed Feb 20, 11:34 am)

Re: [PATCH] mmu notifiers #v6, Robin Holt, (Wed Feb 20, 7:33 am)

Re: [PATCH] mmu notifiers #v6, Andrea Arcangeli, (Wed Feb 20, 8:03 am)

Re: [PATCH] mmu notifiers #v6, Nick Piggin, (Thu Feb 21, 1:02 am)

Re: [PATCH] mmu notifiers #v6, Robin Holt, (Wed Feb 20, 8:24 am)

Re: [PATCH] mmu notifiers #v6, Andrea Arcangeli, (Wed Feb 20, 8:32 am)

Re: [PATCH] mmu notifiers #v6, Robin Holt, (Wed Feb 20, 9:15 am)

[PATCH] KVM swapping (+ seqlock fix) with mmu notifiers #v6, Andrea Arcangeli, (Wed Feb 20, 6:45 am)

[PATCH] KVM swapping with mmu notifiers #v7, Andrea Arcangeli, (Wed Feb 27, 6:06 pm)

Re: [PATCH] KVM swapping with mmu notifiers #v7, izik eidus, (Thu Feb 28, 4:42 am)

Re: [patch] my mmu notifiers, Jack Steiner, (Tue Feb 19, 7:40 pm)

Re: [patch] my mmu notifiers, Nick Piggin, (Thu Feb 21, 12:42 am)

Re: [patch] my mmu notifiers, Jack Steiner, (Fri Feb 22, 12:31 pm)

Re: [patch] my mmu notifiers, Nick Piggin, (Tue Feb 19, 6:59 pm)

Re: [patch] my mmu notifiers, Christoph Lameter, (Wed Feb 27, 6:55 pm)

Re: [patch] my mmu notifiers, Andrea Arcangeli, (Tue Feb 19, 8:46 pm)

Re: [patch] my mmu notifiers, Jack Steiner, (Tue Feb 19, 10:27 am)

Re: [patch] my mmu notifiers, Christoph Lameter, (Wed Feb 27, 6:50 pm)

Re: [patch] my mmu notifiers, Nick Piggin, (Tue Feb 19, 7:04 pm)

Re: [patch] my mmu notifiers, Andrea Arcangeli, (Tue Feb 19, 8:52 pm)

Re: [patch] my mmu notifiers, Robin Holt, (Tue Feb 19, 10:46 pm)

Re: [patch] my mmu notifiers, Robin Holt, (Tue Feb 19, 7:59 am)

[patch] my mmu notifier sample driver, Nick Piggin, (Tue Feb 19, 4:44 am)

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