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From: Avi Kivity <avi@redhat.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
	Paul Turner <pjt@google.com>,
	Suresh Siddha <suresh.b.siddha@intel.com>,
	Mike Galbraith <efault@gmx.de>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Lai Jiangshan <laijs@cn.fujitsu.com>,
	Dan Smith <danms@us.ibm.com>,
	Bharata B Rao <bharata.rao@gmail.com>,
	Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Rik van Riel <riel@redhat.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC][PATCH 00/26] sched/numa
Date: Mon, 19 Mar 2012 14:24:31 +0200	[thread overview]
Message-ID: <4F67257F.4030803@redhat.com> (raw)
In-Reply-To: <1332159657.18960.321.camel@twins>

On 03/19/2012 02:20 PM, Peter Zijlstra wrote:
> On Mon, 2012-03-19 at 13:42 +0200, Avi Kivity wrote:
> > It's the standard space/time tradeoff.  Once solution wants more
> > storage, the other wants more faults.
> > 
> > Note scanners can use A/D bits which are cheaper than faults.
>
> I'm not convinced.. the scanner will still consume time even if the
> system is perfectly balanced -- it has to in order to determine this.
>
> So sure, A/D/other page table magic can make scanners faster than faults
> however you only need faults when you're actually going to migrate a
> task. Whereas you always need to scan, even in the stable state.
>
> So while the per-instance times might be in favour of scanning, I'm
> thinking the accumulated time is in favour of faults.

When you migrate a vnode, you don't need the faults at all.  You know
exactly which pages need to be migrated, you can just queue them
immediately when you make that decision.

The scanning therefore only needs to pick up the stragglers and can be
set to a very low frequency.

-- 
error compiling committee.c: too many arguments to function


WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
	Paul Turner <pjt@google.com>,
	Suresh Siddha <suresh.b.siddha@intel.com>,
	Mike Galbraith <efault@gmx.de>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Lai Jiangshan <laijs@cn.fujitsu.com>,
	Dan Smith <danms@us.ibm.com>,
	Bharata B Rao <bharata.rao@gmail.com>,
	Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Rik van Riel <riel@redhat.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC][PATCH 00/26] sched/numa
Date: Mon, 19 Mar 2012 14:24:31 +0200	[thread overview]
Message-ID: <4F67257F.4030803@redhat.com> (raw)
In-Reply-To: <1332159657.18960.321.camel@twins>

On 03/19/2012 02:20 PM, Peter Zijlstra wrote:
> On Mon, 2012-03-19 at 13:42 +0200, Avi Kivity wrote:
> > It's the standard space/time tradeoff.  Once solution wants more
> > storage, the other wants more faults.
> > 
> > Note scanners can use A/D bits which are cheaper than faults.
>
> I'm not convinced.. the scanner will still consume time even if the
> system is perfectly balanced -- it has to in order to determine this.
>
> So sure, A/D/other page table magic can make scanners faster than faults
> however you only need faults when you're actually going to migrate a
> task. Whereas you always need to scan, even in the stable state.
>
> So while the per-instance times might be in favour of scanning, I'm
> thinking the accumulated time is in favour of faults.

When you migrate a vnode, you don't need the faults at all.  You know
exactly which pages need to be migrated, you can just queue them
immediately when you make that decision.

The scanning therefore only needs to pick up the stragglers and can be
set to a very low frequency.

-- 
error compiling committee.c: too many arguments to function

--
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  reply	other threads:[~2012-03-19 12:25 UTC|newest]

Thread overview: 304+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-16 14:40 [RFC][PATCH 00/26] sched/numa Peter Zijlstra
2012-03-16 14:40 ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 01/26] mm, mpol: Re-implement check_*_range() using walk_page_range() Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 02/26] mm, mpol: Remove NUMA_INTERLEAVE_HIT Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-07-06 10:32   ` Johannes Weiner
2012-07-06 10:32     ` Johannes Weiner
2012-07-06 13:46     ` [tip:sched/core] mm: Fix vmstat names-values off-by-one tip-bot for Johannes Weiner
2012-07-06 14:48     ` [RFC][PATCH 02/26] mm, mpol: Remove NUMA_INTERLEAVE_HIT Minchan Kim
2012-07-06 14:48       ` Minchan Kim
2012-07-06 15:02       ` Peter Zijlstra
2012-07-06 15:02         ` Peter Zijlstra
2012-07-06 14:54   ` Kyungmin Park
2012-07-06 14:54     ` Kyungmin Park
2012-07-06 15:00     ` Peter Zijlstra
2012-07-06 15:00       ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 03/26] mm, mpol: add MPOL_MF_LAZY Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-23 11:50   ` Mel Gorman
2012-03-23 11:50     ` Mel Gorman
2012-07-06 16:38     ` Rik van Riel
2012-07-06 16:38       ` Rik van Riel
2012-07-06 20:04       ` Lee Schermerhorn
2012-07-06 20:04         ` Lee Schermerhorn
2012-07-06 20:27         ` Rik van Riel
2012-07-06 20:27           ` Rik van Riel
2012-07-09 11:48       ` Peter Zijlstra
2012-07-09 11:48         ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 04/26] mm, mpol: add MPOL_MF_NOOP Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-07-06 18:40   ` Rik van Riel
2012-07-06 18:40     ` Rik van Riel
2012-03-16 14:40 ` [RFC][PATCH 05/26] mm, mpol: Check for misplaced page Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 06/26] mm: Migrate " Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-04-03 17:32   ` Dan Smith
2012-04-03 17:32     ` Dan Smith
2012-03-16 14:40 ` [RFC][PATCH 07/26] mm: Handle misplaced anon pages Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 08/26] mm, mpol: Simplify do_mbind() Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 09/26] sched, mm: Introduce tsk_home_node() Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 10/26] mm, mpol: Make mempolicy home-node aware Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 18:34   ` Christoph Lameter
2012-03-16 18:34     ` Christoph Lameter
2012-03-16 21:12     ` Peter Zijlstra
2012-03-16 21:12       ` Peter Zijlstra
2012-03-19 13:53       ` Christoph Lameter
2012-03-19 13:53         ` Christoph Lameter
2012-03-19 14:05         ` Peter Zijlstra
2012-03-19 14:05           ` Peter Zijlstra
2012-03-19 15:16           ` Christoph Lameter
2012-03-19 15:16             ` Christoph Lameter
2012-03-19 15:23             ` Peter Zijlstra
2012-03-19 15:23               ` Peter Zijlstra
2012-03-19 15:31               ` Christoph Lameter
2012-03-19 15:31                 ` Christoph Lameter
2012-03-19 17:09                 ` Peter Zijlstra
2012-03-19 17:09                   ` Peter Zijlstra
2012-03-19 17:28                   ` Peter Zijlstra
2012-03-19 17:28                     ` Peter Zijlstra
2012-03-19 19:06                   ` Christoph Lameter
2012-03-19 19:06                     ` Christoph Lameter
2012-03-19 20:28                   ` Lee Schermerhorn
2012-03-19 20:28                     ` Lee Schermerhorn
2012-03-19 21:21                     ` Peter Zijlstra
2012-03-19 21:21                       ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 11/26] mm, mpol: Lazy migrate a process/vma Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 12/26] sched, mm: sched_{fork,exec} node assignment Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-06-15 18:16   ` Tony Luck
2012-06-15 18:16     ` Tony Luck
2012-06-20 19:12     ` [PATCH] sched: Fix build problems when CONFIG_NUMA=y and CONFIG_SMP=n Luck, Tony
2012-06-20 19:12       ` Luck, Tony
2012-03-16 14:40 ` [RFC][PATCH 13/26] sched: Implement home-node awareness Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 14/26] sched, numa: Numa balancer Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-07-07 18:26   ` Rik van Riel
2012-07-07 18:26     ` Rik van Riel
2012-07-09 12:05     ` Peter Zijlstra
2012-07-09 12:05       ` Peter Zijlstra
2012-07-09 12:23     ` Peter Zijlstra
2012-07-09 12:23       ` Peter Zijlstra
2012-07-09 12:40       ` Peter Zijlstra
2012-07-09 12:40         ` Peter Zijlstra
2012-07-09 14:50         ` Rik van Riel
2012-07-09 14:50           ` Rik van Riel
2012-07-08 18:35   ` Rik van Riel
2012-07-08 18:35     ` Rik van Riel
2012-07-09 12:25     ` Peter Zijlstra
2012-07-09 12:25       ` Peter Zijlstra
2012-07-09 14:54       ` Rik van Riel
2012-07-09 14:54         ` Rik van Riel
2012-07-12 22:02   ` Rik van Riel
2012-07-12 22:02     ` Rik van Riel
2012-07-13 14:45     ` Don Morris
2012-07-13 14:45       ` Don Morris
2012-07-14 16:20       ` Rik van Riel
2012-07-14 16:20         ` Rik van Riel
2012-03-16 14:40 ` [RFC][PATCH 15/26] sched, numa: Implement hotplug hooks Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-19 12:16   ` Srivatsa S. Bhat
2012-03-19 12:16     ` Srivatsa S. Bhat
2012-03-19 12:19     ` Peter Zijlstra
2012-03-19 12:19       ` Peter Zijlstra
2012-03-19 12:27       ` Srivatsa S. Bhat
2012-03-19 12:27         ` Srivatsa S. Bhat
2012-03-16 14:40 ` [RFC][PATCH 16/26] sched, numa: Abstract the numa_entity Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 17/26] srcu: revert1 Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 18/26] srcu: revert2 Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 19/26] srcu: Implement call_srcu() Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 20/26] mm, mpol: Introduce vma_dup_policy() Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 21/26] mm, mpol: Introduce vma_put_policy() Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 22/26] mm, mpol: Split and explose some mempolicy functions Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 23/26] sched, numa: Introduce sys_numa_{t,m}bind() Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 24/26] mm, mpol: Implement numa_group RSS accounting Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 25/26] sched, numa: Only migrate long-running entities Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-07-08 18:34   ` Rik van Riel
2012-07-08 18:34     ` Rik van Riel
2012-07-09 12:26     ` Peter Zijlstra
2012-07-09 12:26       ` Peter Zijlstra
2012-07-09 14:53       ` Rik van Riel
2012-07-09 14:53         ` Rik van Riel
2012-07-09 14:55         ` Peter Zijlstra
2012-07-09 14:55           ` Peter Zijlstra
2012-03-16 14:40 ` [RFC][PATCH 26/26] sched, numa: A few debug bits Peter Zijlstra
2012-03-16 14:40   ` Peter Zijlstra
2012-03-16 18:25 ` [RFC] AutoNUMA alpha6 Andrea Arcangeli
2012-03-16 18:25   ` Andrea Arcangeli
2012-03-19 18:47   ` Peter Zijlstra
2012-03-19 18:47     ` Peter Zijlstra
2012-03-19 19:02     ` Andrea Arcangeli
2012-03-19 19:02       ` Andrea Arcangeli
2012-03-20 23:41   ` Dan Smith
2012-03-20 23:41     ` Dan Smith
2012-03-21  1:00     ` Andrea Arcangeli
2012-03-21  1:00       ` Andrea Arcangeli
2012-03-21  2:12     ` Andrea Arcangeli
2012-03-21  2:12       ` Andrea Arcangeli
2012-03-21  4:01       ` Dan Smith
2012-03-21  4:01         ` Dan Smith
2012-03-21 12:49         ` Andrea Arcangeli
2012-03-21 12:49           ` Andrea Arcangeli
2012-03-21 22:05           ` Dan Smith
2012-03-21 22:05             ` Dan Smith
2012-03-21 22:52             ` Andrea Arcangeli
2012-03-21 22:52               ` Andrea Arcangeli
2012-03-21 23:13               ` Dan Smith
2012-03-21 23:13                 ` Dan Smith
2012-03-21 23:41                 ` Andrea Arcangeli
2012-03-21 23:41                   ` Andrea Arcangeli
2012-03-22  0:17               ` Andrea Arcangeli
2012-03-22  0:17                 ` Andrea Arcangeli
2012-03-22 13:58                 ` Dan Smith
2012-03-22 13:58                   ` Dan Smith
2012-03-22 14:27                   ` Andrea Arcangeli
2012-03-22 18:49                     ` Andrea Arcangeli
2012-03-22 18:49                       ` Andrea Arcangeli
2012-03-22 18:56                       ` Dan Smith
2012-03-22 18:56                         ` Dan Smith
2012-03-22 19:11                         ` Andrea Arcangeli
2012-03-22 19:11                           ` Andrea Arcangeli
2012-03-23 14:15                         ` Andrew Theurer
2012-03-23 14:15                           ` Andrew Theurer
2012-03-23 16:01                           ` Andrea Arcangeli
2012-03-23 16:01                             ` Andrea Arcangeli
2012-03-25 13:30                         ` Andrea Arcangeli
2012-03-25 13:30                           ` Andrea Arcangeli
2012-03-21  7:12       ` Ingo Molnar
2012-03-21  7:12         ` Ingo Molnar
2012-03-21 12:08         ` Andrea Arcangeli
2012-03-21 12:08           ` Andrea Arcangeli
2012-03-21  7:53     ` Ingo Molnar
2012-03-21  7:53       ` Ingo Molnar
2012-03-21 12:17       ` Andrea Arcangeli
2012-03-21 12:17         ` Andrea Arcangeli
2012-03-19  9:57 ` [RFC][PATCH 00/26] sched/numa Avi Kivity
2012-03-19  9:57   ` Avi Kivity
2012-03-19 11:12   ` Peter Zijlstra
2012-03-19 11:12     ` Peter Zijlstra
2012-03-19 11:30     ` Peter Zijlstra
2012-03-19 11:30       ` Peter Zijlstra
2012-03-19 11:39     ` Peter Zijlstra
2012-03-19 11:39       ` Peter Zijlstra
2012-03-19 11:42     ` Avi Kivity
2012-03-19 11:42       ` Avi Kivity
2012-03-19 11:59       ` Peter Zijlstra
2012-03-19 11:59         ` Peter Zijlstra
2012-03-19 12:07         ` Avi Kivity
2012-03-19 12:07           ` Avi Kivity
2012-03-19 12:09       ` Peter Zijlstra
2012-03-19 12:09         ` Peter Zijlstra
2012-03-19 12:16         ` Avi Kivity
2012-03-19 12:16           ` Avi Kivity
2012-03-19 20:03           ` Peter Zijlstra
2012-03-19 20:03             ` Peter Zijlstra
2012-03-20 10:18             ` Avi Kivity
2012-03-20 10:18               ` Avi Kivity
2012-03-20 10:48               ` Peter Zijlstra
2012-03-20 10:48                 ` Peter Zijlstra
2012-03-20 10:52                 ` Avi Kivity
2012-03-20 10:52                   ` Avi Kivity
2012-03-20 11:07                   ` Peter Zijlstra
2012-03-20 11:07                     ` Peter Zijlstra
2012-03-20 11:48                     ` Avi Kivity
2012-03-20 11:48                       ` Avi Kivity
2012-03-19 12:20       ` Peter Zijlstra
2012-03-19 12:20         ` Peter Zijlstra
2012-03-19 12:24         ` Avi Kivity [this message]
2012-03-19 12:24           ` Avi Kivity
2012-03-19 15:44           ` Avi Kivity
2012-03-19 15:44             ` Avi Kivity
2012-03-19 13:40       ` Andrea Arcangeli
2012-03-19 13:40         ` Andrea Arcangeli
2012-03-19 20:06         ` Peter Zijlstra
2012-03-19 20:06           ` Peter Zijlstra
2012-03-19 13:04     ` Andrea Arcangeli
2012-03-19 13:04       ` Andrea Arcangeli
2012-03-19 13:26       ` Peter Zijlstra
2012-03-19 13:26         ` Peter Zijlstra
2012-03-19 13:57         ` Andrea Arcangeli
2012-03-19 13:57           ` Andrea Arcangeli
2012-03-19 14:06           ` Avi Kivity
2012-03-19 14:06             ` Avi Kivity
2012-03-19 14:30             ` Andrea Arcangeli
2012-03-19 14:30               ` Andrea Arcangeli
2012-03-19 18:42               ` Peter Zijlstra
2012-03-19 18:42                 ` Peter Zijlstra
2012-03-20 22:18                 ` Rik van Riel
2012-03-20 22:18                   ` Rik van Riel
2012-03-21 16:50                   ` Andrea Arcangeli
2012-03-21 16:50                     ` Andrea Arcangeli
2012-04-02 16:34                   ` Pekka Enberg
2012-04-02 16:34                     ` Pekka Enberg
2012-04-02 16:55                     ` Rik van Riel
2012-04-02 16:55                       ` Rik van Riel
2012-04-02 16:54                       ` Pekka Enberg
2012-04-02 16:54                         ` Pekka Enberg
2012-04-02 17:12                         ` Pekka Enberg
2012-04-02 17:12                           ` Pekka Enberg
2012-04-02 17:23                           ` Pekka Enberg
2012-04-02 17:23                             ` Pekka Enberg
2012-03-19 14:07           ` Peter Zijlstra
2012-03-19 14:07             ` Peter Zijlstra
2012-03-19 14:34             ` Andrea Arcangeli
2012-03-19 14:34               ` Andrea Arcangeli
2012-03-19 18:41               ` Peter Zijlstra
2012-03-19 18:41                 ` Peter Zijlstra
2012-03-19 19:13           ` Peter Zijlstra
2012-03-19 19:13             ` Peter Zijlstra
2012-03-19 14:07         ` Andrea Arcangeli
2012-03-19 14:07           ` Andrea Arcangeli
2012-03-19 19:05           ` Peter Zijlstra
2012-03-19 19:05             ` Peter Zijlstra
2012-03-19 13:26       ` Peter Zijlstra
2012-03-19 13:26         ` Peter Zijlstra
2012-03-19 14:16         ` Andrea Arcangeli
2012-03-19 14:16           ` Andrea Arcangeli
2012-03-19 13:29       ` Peter Zijlstra
2012-03-19 13:29         ` Peter Zijlstra
2012-03-19 14:19         ` Andrea Arcangeli
2012-03-19 14:19           ` Andrea Arcangeli
2012-03-19 13:39       ` Peter Zijlstra
2012-03-19 13:39         ` Peter Zijlstra
2012-03-19 14:20         ` Andrea Arcangeli
2012-03-19 14:20           ` Andrea Arcangeli
2012-03-19 20:17           ` Christoph Lameter
2012-03-19 20:17             ` Christoph Lameter
2012-03-19 20:28             ` Ingo Molnar
2012-03-19 20:28               ` Ingo Molnar
2012-03-19 20:43               ` Christoph Lameter
2012-03-19 20:43                 ` Christoph Lameter
2012-03-19 21:34                 ` Ingo Molnar
2012-03-19 21:34                   ` Ingo Molnar
2012-03-20  0:05               ` Linus Torvalds
2012-03-20  0:05                 ` Linus Torvalds
2012-03-20  7:31                 ` Ingo Molnar
2012-03-20  7:31                   ` Ingo Molnar
2012-03-21 22:53 ` Nish Aravamudan
2012-03-21 22:53   ` Nish Aravamudan
2012-03-22  9:45   ` Peter Zijlstra
2012-03-22  9:45     ` Peter Zijlstra
2012-03-22 10:34     ` Ingo Molnar
2012-03-22 10:34       ` Ingo Molnar
2012-03-24  1:41     ` Nish Aravamudan
2012-03-24  1:41       ` Nish Aravamudan
2012-03-26 11:42       ` Peter Zijlstra
2012-03-26 11:42         ` Peter Zijlstra

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