From: Ingo Molnar <mingo@kernel.org> To: Linus Torvalds <torvalds@linux-foundation.org> Cc: Rik van Riel <riel@redhat.com>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Andrea Arcangeli <aarcange@redhat.com>, Mel Gorman <mgorman@suse.de>, Johannes Weiner <hannes@cmpxchg.org>, Thomas Gleixner <tglx@linutronix.de>, Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 05/31] x86/mm: Reduce tlb flushes from ptep_set_access_flags() Date: Fri, 26 Oct 2012 08:42:00 +0200 [thread overview] Message-ID: <20121026064200.GB8141@gmail.com> (raw) In-Reply-To: <CA+55aFx2fSdDcFxYmu00JP9rHiZ1BjH3tO4CfYXOhf_rjRP_Eg@mail.gmail.com> * Linus Torvalds <torvalds@linux-foundation.org> wrote: > On Thu, Oct 25, 2012 at 8:57 PM, Rik van Riel <riel@redhat.com> wrote: > > > > That may not even be needed. Apparently Intel chips > > automatically flush an entry from the TLB when it causes a > > page fault. I assume AMD chips do the same, because > > flush_tlb_fix_spurious_fault evaluates to nothing on x86. > > Yes. It's not architected as far as I know, though. But I > agree, it's possible - even likely - we could avoid TLB > flushing entirely on x86. > > If you want to try it, I would seriously suggest you do it as > a separate commit though, just in case. Ok, will do it like that. INVLPG overhead is small effect, nevertheless it's worth trying. What *has* shown up in my profiles though, and which drove some of these changes is that for heavily threaded VM-intense workloads such as a single SPECjbb JVM instance running on all CPUs and all nodes, TLB flushes with any sort of serialization aspect are absolutely deadly. So just to be *able* to verify the performance benefit and impact of some of the later NUMA-directed changes, we had to eliminate a number of scalability bottlenecks and put these optimization patches in front of the main changes. That is why you have to go 20+ patches into the queue to see the real point :-/ > > Are there architectures where we do need to flush remote > > TLBs on upgrading the permissions on a PTE? > > I *suspect* that whole TLB flush just magically became an SMP > one without anybody ever really thinking about it. Yeah, and I think part of the problem is that it's also a not particularly straightforward to analyze performance bottleneck: SMP TLB flushing does not show up as visible high overhead in profiles mainly, it mostly shows up as extra idle time. If the nature of the workload is that it has extra available paralellism that can fill in the idle time, it will mask much of the effect and there's only a slight shift in the profile. It needs a borderline loaded system and sleep profiling to pinpoint these sources of overhead. [...] > > From reading the code again, it looks like things should > > indeed work ok. > > I would be open to it, but just in case it causes bisectable > problems I'd really want to see it in two patches ("make it > always do the local flush" followed by "remove even the local > flush"), and then it would pinpoint any need. Yeah, 100% agreed. Thanks, Ingo
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From: Ingo Molnar <mingo@kernel.org> To: Linus Torvalds <torvalds@linux-foundation.org> Cc: Rik van Riel <riel@redhat.com>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Andrea Arcangeli <aarcange@redhat.com>, Mel Gorman <mgorman@suse.de>, Johannes Weiner <hannes@cmpxchg.org>, Thomas Gleixner <tglx@linutronix.de>, Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 05/31] x86/mm: Reduce tlb flushes from ptep_set_access_flags() Date: Fri, 26 Oct 2012 08:42:00 +0200 [thread overview] Message-ID: <20121026064200.GB8141@gmail.com> (raw) In-Reply-To: <CA+55aFx2fSdDcFxYmu00JP9rHiZ1BjH3tO4CfYXOhf_rjRP_Eg@mail.gmail.com> * Linus Torvalds <torvalds@linux-foundation.org> wrote: > On Thu, Oct 25, 2012 at 8:57 PM, Rik van Riel <riel@redhat.com> wrote: > > > > That may not even be needed. Apparently Intel chips > > automatically flush an entry from the TLB when it causes a > > page fault. I assume AMD chips do the same, because > > flush_tlb_fix_spurious_fault evaluates to nothing on x86. > > Yes. It's not architected as far as I know, though. But I > agree, it's possible - even likely - we could avoid TLB > flushing entirely on x86. > > If you want to try it, I would seriously suggest you do it as > a separate commit though, just in case. Ok, will do it like that. INVLPG overhead is small effect, nevertheless it's worth trying. What *has* shown up in my profiles though, and which drove some of these changes is that for heavily threaded VM-intense workloads such as a single SPECjbb JVM instance running on all CPUs and all nodes, TLB flushes with any sort of serialization aspect are absolutely deadly. So just to be *able* to verify the performance benefit and impact of some of the later NUMA-directed changes, we had to eliminate a number of scalability bottlenecks and put these optimization patches in front of the main changes. That is why you have to go 20+ patches into the queue to see the real point :-/ > > Are there architectures where we do need to flush remote > > TLBs on upgrading the permissions on a PTE? > > I *suspect* that whole TLB flush just magically became an SMP > one without anybody ever really thinking about it. Yeah, and I think part of the problem is that it's also a not particularly straightforward to analyze performance bottleneck: SMP TLB flushing does not show up as visible high overhead in profiles mainly, it mostly shows up as extra idle time. If the nature of the workload is that it has extra available paralellism that can fill in the idle time, it will mask much of the effect and there's only a slight shift in the profile. It needs a borderline loaded system and sleep profiling to pinpoint these sources of overhead. [...] > > From reading the code again, it looks like things should > > indeed work ok. > > I would be open to it, but just in case it causes bisectable > problems I'd really want to see it in two patches ("make it > always do the local flush" followed by "remove even the local > flush"), and then it would pinpoint any need. Yeah, 100% agreed. Thanks, Ingo -- 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:[~2012-10-26 6:42 UTC|newest] Thread overview: 269+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-10-25 12:16 [PATCH 00/31] numa/core patches Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 01/31] sched, numa, mm: Make find_busiest_queue() a method Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 02/31] sched, numa, mm: Describe the NUMA scheduling problem formally Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 9:56 ` Mel Gorman 2012-11-01 9:56 ` Mel Gorman 2012-11-01 13:13 ` Rik van Riel 2012-11-01 13:13 ` Rik van Riel 2012-10-25 12:16 ` [PATCH 03/31] mm/thp: Preserve pgprot across huge page split Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 10:22 ` Mel Gorman 2012-11-01 10:22 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 04/31] x86/mm: Introduce pte_accessible() Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 20:10 ` Linus Torvalds 2012-10-25 20:10 ` Linus Torvalds 2012-10-26 6:24 ` [PATCH 04/31, v2] " Ingo Molnar 2012-10-26 6:24 ` Ingo Molnar 2012-11-01 10:42 ` [PATCH 04/31] " Mel Gorman 2012-11-01 10:42 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 05/31] x86/mm: Reduce tlb flushes from ptep_set_access_flags() Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 20:17 ` Linus Torvalds 2012-10-25 20:17 ` Linus Torvalds 2012-10-26 2:30 ` Rik van Riel 2012-10-26 2:30 ` Rik van Riel 2012-10-26 2:56 ` Linus Torvalds 2012-10-26 2:56 ` Linus Torvalds 2012-10-26 3:57 ` Rik van Riel 2012-10-26 3:57 ` Rik van Riel 2012-10-26 4:23 ` Linus Torvalds 2012-10-26 4:23 ` Linus Torvalds 2012-10-26 6:42 ` Ingo Molnar [this message] 2012-10-26 6:42 ` Ingo Molnar 2012-10-26 12:34 ` Michel Lespinasse 2012-10-26 12:34 ` Michel Lespinasse 2012-10-26 12:48 ` Andi Kleen 2012-10-26 12:48 ` Andi Kleen 2012-10-26 13:16 ` Rik van Riel 2012-10-26 13:16 ` Rik van Riel 2012-10-26 13:26 ` Ingo Molnar 2012-10-26 13:26 ` Ingo Molnar 2012-10-26 13:28 ` Ingo Molnar 2012-10-26 13:28 ` Ingo Molnar 2012-10-26 18:44 ` [PATCH 1/3] x86/mm: only do a local TLB flush in ptep_set_access_flags() Rik van Riel 2012-10-26 18:44 ` Rik van Riel 2012-10-26 18:49 ` Linus Torvalds 2012-10-26 18:49 ` Linus Torvalds 2012-10-26 19:16 ` Rik van Riel 2012-10-26 19:16 ` Rik van Riel 2012-10-26 19:18 ` Linus Torvalds 2012-10-26 19:18 ` Linus Torvalds 2012-10-26 19:21 ` Rik van Riel 2012-10-26 19:21 ` Rik van Riel 2012-10-29 15:23 ` Rik van Riel 2012-10-29 15:23 ` Rik van Riel 2012-12-21 9:57 ` trailing flush_tlb_fix_spurious_fault in handle_pte_fault (was Re: [PATCH 1/3] x86/mm: only do a local TLB flush in ptep_set_access_flags()) Vineet Gupta 2012-12-21 9:57 ` Vineet Gupta 2012-10-26 18:45 ` [PATCH 2/3] x86,mm: drop TLB flush from ptep_set_access_flags Rik van Riel 2012-10-26 18:45 ` Rik van Riel 2012-10-26 21:12 ` Alan Cox 2012-10-26 21:12 ` Alan Cox 2012-10-27 3:49 ` Rik van Riel 2012-10-27 3:49 ` Rik van Riel 2012-10-27 10:29 ` Ingo Molnar 2012-10-27 10:29 ` Ingo Molnar 2012-10-27 13:40 ` Rik van Riel 2012-10-27 13:40 ` Rik van Riel 2012-10-29 16:57 ` Borislav Petkov 2012-10-29 16:57 ` Borislav Petkov 2012-10-29 17:06 ` Linus Torvalds 2012-10-29 17:06 ` Linus Torvalds 2012-11-17 14:50 ` Borislav Petkov 2012-11-17 14:50 ` Borislav Petkov 2012-11-17 14:56 ` Linus Torvalds 2012-11-17 14:56 ` Linus Torvalds 2012-11-17 15:17 ` Borislav Petkov 2012-11-17 15:17 ` Borislav Petkov 2012-11-17 15:24 ` Rik van Riel 2012-11-17 15:24 ` Rik van Riel 2012-11-17 21:53 ` Shentino 2012-11-17 21:53 ` Shentino 2012-11-18 15:29 ` Michel Lespinasse 2012-11-18 15:29 ` Michel Lespinasse 2012-10-26 18:46 ` [PATCH 3/3] mm,generic: only flush the local TLB in ptep_set_access_flags Rik van Riel 2012-10-26 18:46 ` Rik van Riel 2012-10-26 18:48 ` Linus Torvalds 2012-10-26 18:48 ` Linus Torvalds 2012-10-26 18:53 ` Linus Torvalds 2012-10-26 18:53 ` Linus Torvalds 2012-10-26 18:57 ` Rik van Riel 2012-10-26 18:57 ` Rik van Riel 2012-10-26 19:16 ` Linus Torvalds 2012-10-26 19:16 ` Linus Torvalds 2012-10-26 19:33 ` [PATCH -v2 " Rik van Riel 2012-10-26 19:33 ` Rik van Riel 2012-10-26 13:23 ` [PATCH 05/31] x86/mm: Reduce tlb flushes from ptep_set_access_flags() Michel Lespinasse 2012-10-26 13:23 ` Michel Lespinasse 2012-10-26 17:01 ` Linus Torvalds 2012-10-26 17:01 ` Linus Torvalds 2012-10-26 17:54 ` Rik van Riel 2012-10-26 17:54 ` Rik van Riel 2012-10-26 18:02 ` Linus Torvalds 2012-10-26 18:02 ` Linus Torvalds 2012-10-26 18:14 ` Rik van Riel 2012-10-26 18:14 ` Rik van Riel 2012-10-26 18:41 ` Linus Torvalds 2012-10-26 18:41 ` Linus Torvalds 2012-10-25 12:16 ` [PATCH 06/31] mm: Only flush the TLB when clearing an accessible pte Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 07/31] sched, numa, mm, s390/thp: Implement pmd_pgprot() for s390 Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 10:49 ` Mel Gorman 2012-11-01 10:49 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 08/31] sched, numa, mm, MIPS/thp: Add pmd_pgprot() implementation Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 09/31] mm/pgprot: Move the pgprot_modify() fallback definition to mm.h Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 10/31] mm/mpol: Remove NUMA_INTERLEAVE_HIT Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 20:58 ` Andi Kleen 2012-10-25 20:58 ` Andi Kleen 2012-10-26 7:59 ` Ingo Molnar 2012-10-26 7:59 ` Ingo Molnar 2012-10-25 12:16 ` [PATCH 11/31] mm/mpol: Make MPOL_LOCAL a real policy Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 10:58 ` Mel Gorman 2012-11-01 10:58 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 12/31] mm/mpol: Add MPOL_MF_NOOP Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 11:10 ` Mel Gorman 2012-11-01 11:10 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 13/31] mm/mpol: Check for misplaced page Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 14/31] mm/mpol: Create special PROT_NONE infrastructure Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 11:51 ` Mel Gorman 2012-11-01 11:51 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 15/31] mm/mpol: Add MPOL_MF_LAZY Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 12:01 ` Mel Gorman 2012-11-01 12:01 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 16/31] numa, mm: Support NUMA hinting page faults from gup/gup_fast Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 17/31] mm/migrate: Introduce migrate_misplaced_page() Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 12:20 ` Mel Gorman 2012-11-01 12:20 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 18/31] mm/mpol: Use special PROT_NONE to migrate pages Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 19/31] sched, numa, mm: Introduce tsk_home_node() Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 13:48 ` Mel Gorman 2012-11-01 13:48 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 20/31] sched, numa, mm/mpol: Make mempolicy home-node aware Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 13:58 ` Mel Gorman 2012-11-01 13:58 ` Mel Gorman 2012-11-01 14:10 ` Don Morris 2012-11-01 14:10 ` Don Morris 2012-10-25 12:16 ` [PATCH 21/31] sched, numa, mm: Introduce sched_feat_numa() Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 14:00 ` Mel Gorman 2012-11-01 14:00 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 22/31] sched, numa, mm: Implement THP migration Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 14:16 ` Mel Gorman 2012-11-01 14:16 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 23/31] sched, numa, mm: Implement home-node awareness Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 15:06 ` Mel Gorman 2012-11-01 15:06 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 24/31] sched, numa, mm: Introduce last_nid in the pageframe Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 15:17 ` Mel Gorman 2012-11-01 15:17 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 25/31] sched, numa, mm/mpol: Add_MPOL_F_HOME Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 26/31] sched, numa, mm: Add fault driven placement and migration policy Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 20:53 ` Linus Torvalds 2012-10-25 20:53 ` Linus Torvalds 2012-10-26 7:15 ` Ingo Molnar 2012-10-26 7:15 ` Ingo Molnar 2012-10-26 13:50 ` Ingo Molnar 2012-10-26 13:50 ` Ingo Molnar 2012-10-26 14:11 ` Peter Zijlstra 2012-10-26 14:11 ` Peter Zijlstra 2012-10-26 14:14 ` Ingo Molnar 2012-10-26 14:14 ` Ingo Molnar 2012-10-26 16:47 ` Linus Torvalds 2012-10-26 16:47 ` Linus Torvalds 2012-10-30 19:23 ` Rik van Riel 2012-10-30 19:23 ` Rik van Riel 2012-11-01 15:40 ` Mel Gorman 2012-11-01 15:40 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 27/31] sched, numa, mm: Add credits for NUMA placement Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 28/31] sched, numa, mm: Implement constant, per task Working Set Sampling (WSS) rate Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 15:48 ` Mel Gorman 2012-11-01 15:48 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 29/31] sched, numa, mm: Add NUMA_MIGRATION feature flag Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-25 12:16 ` [PATCH 30/31] sched, numa, mm: Implement slow start for working set sampling Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-11-01 15:52 ` Mel Gorman 2012-11-01 15:52 ` Mel Gorman 2012-10-25 12:16 ` [PATCH 31/31] sched, numa, mm: Add memcg support to do_huge_pmd_numa_page() Peter Zijlstra 2012-10-25 12:16 ` Peter Zijlstra 2012-10-26 9:07 ` [PATCH 00/31] numa/core patches Zhouping Liu 2012-10-26 9:08 ` Peter Zijlstra 2012-10-26 9:08 ` Peter Zijlstra 2012-10-26 9:20 ` Ingo Molnar 2012-10-26 9:20 ` Ingo Molnar 2012-10-26 9:41 ` Zhouping Liu 2012-10-26 9:41 ` Zhouping Liu 2012-10-26 10:20 ` Zhouping Liu 2012-10-26 10:20 ` Zhouping Liu 2012-10-26 10:24 ` Ingo Molnar 2012-10-26 10:24 ` Ingo Molnar 2012-10-28 17:56 ` Johannes Weiner 2012-10-28 17:56 ` Johannes Weiner 2012-10-29 2:44 ` Zhouping Liu 2012-10-29 2:44 ` Zhouping Liu 2012-10-29 6:50 ` [PATCH] sched, numa, mm: Add memcg support to do_huge_pmd_numa_page() Ingo Molnar 2012-10-29 6:50 ` Ingo Molnar 2012-10-29 8:24 ` Johannes Weiner 2012-10-29 8:24 ` Johannes Weiner 2012-10-29 8:36 ` Zhouping Liu 2012-10-29 8:36 ` Zhouping Liu 2012-10-29 11:15 ` Ingo Molnar 2012-10-29 11:15 ` Ingo Molnar 2012-10-30 6:29 ` [PATCH 00/31] numa/core patches Zhouping Liu 2012-10-30 6:29 ` Zhouping Liu 2012-10-31 0:48 ` Johannes Weiner 2012-10-31 0:48 ` Johannes Weiner 2012-10-31 7:26 ` Hugh Dickins 2012-10-31 7:26 ` Hugh Dickins 2012-10-31 13:15 ` Zhouping Liu 2012-10-31 13:15 ` Zhouping Liu 2012-10-31 17:31 ` Hugh Dickins 2012-10-31 17:31 ` Hugh Dickins 2012-11-01 13:41 ` Hugh Dickins 2012-11-01 13:41 ` Hugh Dickins 2012-11-02 3:23 ` Zhouping Liu 2012-11-02 3:23 ` Zhouping Liu 2012-11-02 23:06 ` Hugh Dickins 2012-11-02 23:06 ` Hugh Dickins 2012-10-30 12:20 ` Mel Gorman 2012-10-30 12:20 ` Mel Gorman 2012-10-30 15:28 ` Andrew Morton 2012-10-30 15:28 ` Andrew Morton 2012-10-30 16:59 ` Mel Gorman 2012-10-30 16:59 ` Mel Gorman 2012-11-03 11:04 ` Alex Shi 2012-11-03 11:04 ` Alex Shi 2012-11-03 12:21 ` Mel Gorman 2012-11-03 12:21 ` Mel Gorman 2012-11-10 2:47 ` Alex Shi 2012-11-10 2:47 ` Alex Shi 2012-11-12 9:50 ` Mel Gorman 2012-11-12 9:50 ` Mel Gorman 2012-11-09 8:51 ` Rik van Riel 2012-11-09 8:51 ` Rik van Riel 2012-11-05 17:11 ` Srikar Dronamraju 2012-11-05 17:11 ` Srikar Dronamraju
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