From: Rik van Riel <riel@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>, Johannes Weiner <hannes@cmpxchg.org>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [RFC][PATCH 04/26] mm, mpol: add MPOL_MF_NOOP Date: Fri, 06 Jul 2012 14:40:06 -0400 [thread overview] Message-ID: <4FF73106.3090802@redhat.com> (raw) In-Reply-To: <20120316144240.368911012@chello.nl> On 03/16/2012 10:40 AM, Peter Zijlstra wrote: Reasonable idea, but we need something else than a blind unmap and add to swap space, which requires people to run with gigantic amounts of swap space they will likely never use. I suspect that Andrea's _PAGE_NUMA stuff could be implemented using _PAGE_PROTNONE, and then we can simply call the NUMA faulting/migration handler whenever we run into a _PAGE_PROTNONE page in handle_mm_fault / handle_pte_fault. This overloading of _PAGE_PROTNONE should work fine, because do_page_fault will never call handle_mm_fault if the fault is happening on a PROT_NONE VMA. Only if we have the correct VMA permission will handle_mm_fault be called, at which point we can fix the pte (and maybe migrate the page). The same trick can be done at the pmd level for transparent hugepages, allowing the entire THP to be migrated in one shot, with just one fault. Is there any reason why _PAGE_PROTNONE could not work instead of _PAGE_NUMA or the swap cache thing? -- All rights reversed
WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@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>, Johannes Weiner <hannes@cmpxchg.org>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [RFC][PATCH 04/26] mm, mpol: add MPOL_MF_NOOP Date: Fri, 06 Jul 2012 14:40:06 -0400 [thread overview] Message-ID: <4FF73106.3090802@redhat.com> (raw) In-Reply-To: <20120316144240.368911012@chello.nl> On 03/16/2012 10:40 AM, Peter Zijlstra wrote: Reasonable idea, but we need something else than a blind unmap and add to swap space, which requires people to run with gigantic amounts of swap space they will likely never use. I suspect that Andrea's _PAGE_NUMA stuff could be implemented using _PAGE_PROTNONE, and then we can simply call the NUMA faulting/migration handler whenever we run into a _PAGE_PROTNONE page in handle_mm_fault / handle_pte_fault. This overloading of _PAGE_PROTNONE should work fine, because do_page_fault will never call handle_mm_fault if the fault is happening on a PROT_NONE VMA. Only if we have the correct VMA permission will handle_mm_fault be called, at which point we can fix the pte (and maybe migrate the page). The same trick can be done at the pmd level for transparent hugepages, allowing the entire THP to be migrated in one shot, with just one fault. Is there any reason why _PAGE_PROTNONE could not work instead of _PAGE_NUMA or the swap cache thing? -- All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2012-07-06 18:41 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 [this message] 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 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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