From: Rik van Riel <riel@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Turner <pjt@google.com>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Christoph Lameter <cl@linux.com>, Mel Gorman <mgorman@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Hugh Dickins <hughd@google.com>
Subject: Re: [RFC PATCH] mm/migration: Remove anon vma locking from try_to_unmap() use
Date: Sat, 01 Dec 2012 13:55:50 -0500 [thread overview]
Message-ID: <50BA52B6.2010009@redhat.com> (raw)
In-Reply-To: <CA+55aFx8QtP0hg8qxn__4vHQuzH7QkhTN-4fwgOpM-A=KuBBjA@mail.gmail.com>
On 12/01/2012 01:38 PM, Linus Torvalds wrote:
> On Sat, Dec 1, 2012 at 4:26 AM, Ingo Molnar <mingo@kernel.org> wrote:
>>
>>
>> So as a quick concept hack I wrote the patch attached below.
>> (It's not signed off, see the patch description text for the
>> reason.)
>
> Well, it confirms that anon_vma locking is a big problem, but as
> outlined in my other email it's completely incorrect from an actual
> behavior standpoint.
>
> Btw, I think the anon_vma lock could be made a spinlock
The anon_vma lock used to be a spinlock, and was turned into a
mutex by Peter, as part of an effort to make more of the VM
preemptible.
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WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Turner <pjt@google.com>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Christoph Lameter <cl@linux.com>, Mel Gorman <mgorman@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Hugh Dickins <hughd@google.com>
Subject: Re: [RFC PATCH] mm/migration: Remove anon vma locking from try_to_unmap() use
Date: Sat, 01 Dec 2012 13:55:50 -0500 [thread overview]
Message-ID: <50BA52B6.2010009@redhat.com> (raw)
In-Reply-To: <CA+55aFx8QtP0hg8qxn__4vHQuzH7QkhTN-4fwgOpM-A=KuBBjA@mail.gmail.com>
On 12/01/2012 01:38 PM, Linus Torvalds wrote:
> On Sat, Dec 1, 2012 at 4:26 AM, Ingo Molnar <mingo@kernel.org> wrote:
>>
>>
>> So as a quick concept hack I wrote the patch attached below.
>> (It's not signed off, see the patch description text for the
>> reason.)
>
> Well, it confirms that anon_vma locking is a big problem, but as
> outlined in my other email it's completely incorrect from an actual
> behavior standpoint.
>
> Btw, I think the anon_vma lock could be made a spinlock
The anon_vma lock used to be a spinlock, and was turned into a
mutex by Peter, as part of an effort to make more of the VM
preemptible.
--
All rights reversed
next prev parent reply other threads:[~2012-12-01 18:56 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-30 19:58 [PATCH 00/10] Latest numa/core release, v18 Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 19:58 ` [PATCH 01/10] sched: Add "task flipping" support Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 19:58 ` [PATCH 02/10] sched: Move the NUMA placement logic to a worklet Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 19:58 ` [PATCH 03/10] numa, mempolicy: Improve CONFIG_NUMA_BALANCING=y OOM behavior Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 19:58 ` [PATCH 04/10] mm, numa: Turn 4K pte NUMA faults into effective hugepage ones Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 19:58 ` [PATCH 05/10] sched: Introduce directed NUMA convergence Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 19:58 ` [PATCH 06/10] sched: Remove statistical NUMA scheduling Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 19:58 ` [PATCH 07/10] sched: Track quality and strength of convergence Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 19:58 ` [PATCH 08/10] sched: Converge NUMA migrations Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 19:58 ` [PATCH 09/10] sched: Add convergence strength based adaptive NUMA page fault rate Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 19:58 ` [PATCH 10/10] sched: Refine the 'shared tasks' memory interleaving logic Ingo Molnar
2012-11-30 19:58 ` Ingo Molnar
2012-11-30 20:37 ` [PATCH 00/10] Latest numa/core release, v18 Linus Torvalds
2012-11-30 20:37 ` Linus Torvalds
2012-12-01 9:49 ` [RFC PATCH] mm/migration: Don't lock anon vmas in rmap_walk_anon() Ingo Molnar
2012-12-01 9:49 ` Ingo Molnar
2012-12-01 12:26 ` [RFC PATCH] mm/migration: Remove anon vma locking from try_to_unmap() use Ingo Molnar
2012-12-01 12:26 ` Ingo Molnar
2012-12-01 18:38 ` Linus Torvalds
2012-12-01 18:38 ` Linus Torvalds
2012-12-01 18:41 ` Ingo Molnar
2012-12-01 18:41 ` Ingo Molnar
2012-12-01 18:50 ` Linus Torvalds
2012-12-01 18:50 ` Linus Torvalds
2012-12-01 20:10 ` [PATCH 1/2] mm/rmap: Convert the struct anon_vma::mutex to an rwsem Ingo Molnar
2012-12-01 20:10 ` Ingo Molnar
2012-12-01 20:19 ` Rik van Riel
2012-12-01 20:19 ` Rik van Riel
2012-12-02 15:10 ` Ingo Molnar
2012-12-02 15:10 ` Ingo Molnar
2012-12-03 13:59 ` Mel Gorman
2012-12-03 13:59 ` Mel Gorman
2012-12-01 20:15 ` [PATCH 2/2] mm/migration: Make rmap_walk_anon() and try_to_unmap_anon() more scalable Ingo Molnar
2012-12-01 20:15 ` Ingo Molnar
2012-12-01 20:33 ` Rik van Riel
2012-12-01 20:33 ` Rik van Riel
2012-12-02 15:12 ` [PATCH 2/2, v2] " Ingo Molnar
2012-12-02 15:12 ` Ingo Molnar
2012-12-02 17:53 ` Rik van Riel
2012-12-02 17:53 ` Rik van Riel
2012-12-04 14:42 ` Michel Lespinasse
2012-12-04 14:42 ` Michel Lespinasse
2012-12-05 2:59 ` Michel Lespinasse
2012-12-05 2:59 ` Michel Lespinasse
2012-12-03 14:17 ` [PATCH 2/2] " Mel Gorman
2012-12-03 14:17 ` Mel Gorman
2012-12-04 14:37 ` Michel Lespinasse
2012-12-04 14:37 ` Michel Lespinasse
2012-12-04 18:17 ` Mel Gorman
2012-12-04 18:17 ` Mel Gorman
2012-12-01 18:55 ` Rik van Riel [this message]
2012-12-01 18:55 ` [RFC PATCH] mm/migration: Remove anon vma locking from try_to_unmap() use Rik van Riel
2012-12-01 16:19 ` [RFC PATCH] mm/migration: Don't lock anon vmas in rmap_walk_anon() Rik van Riel
2012-12-01 16:19 ` Rik van Riel
2012-12-01 17:55 ` Linus Torvalds
2012-12-01 17:55 ` Linus Torvalds
2012-12-01 18:30 ` Ingo Molnar
2012-12-01 18:30 ` Ingo Molnar
2012-12-03 13:41 ` [PATCH 00/10] Latest numa/core release, v18 Mel Gorman
2012-12-03 13:41 ` Mel Gorman
2012-12-04 17:30 ` Thomas Gleixner
2012-12-04 17:30 ` Thomas Gleixner
2012-12-03 10:43 ` Mel Gorman
2012-12-03 10:43 ` Mel Gorman
2012-12-03 11:32 ` Mel Gorman
2012-12-03 11:32 ` Mel Gorman
2012-12-04 22:49 ` Mel Gorman
2012-12-04 22:49 ` Mel Gorman
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