From: Ingo Molnar <mingo@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Rientjes <rientjes@google.com>,
Mel Gorman <mgorman@suse.de>,
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>, Rik van Riel <riel@redhat.com>,
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: [PATCH 00/27] Latest numa/core release, v16
Date: Wed, 21 Nov 2012 18:40:15 +0100 [thread overview]
Message-ID: <20121121174015.GA29331@gmail.com> (raw)
In-Reply-To: <20121121171047.GA28875@gmail.com>
* Ingo Molnar <mingo@kernel.org> wrote:
> So because I did not have an old-glibc system like David's, I
> did not know the actual page fault rate. If it is high enough
> then nonlinear effects might cause such effects.
>
> This is an entirely valid line of inquiry IMO.
Btw., when comparing against 'mainline' I routinely use a
vanilla kernel that has the same optimization applied. (first I
make sure it's not a regression to vanilla.)
I do that to factor out the linear component of the independent
speedup: it would not be valid to compare vanilla against
numa/core+optimization, but the comparison has to be:
vanilla + optimization
vs.
numa/core + optimization
I did that with last night's numbers as well.
So any of this can only address a regression if a non-linear
factor is in play.
Since I have no direct access to a regressing system I have to
work with the theories that I can think of: one had a larger
effect, the other had a smaller effect, the third one had no
effect on David's system.
How would you have done it instead?
Thanks,
Ingo
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WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Rientjes <rientjes@google.com>,
Mel Gorman <mgorman@suse.de>,
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>, Rik van Riel <riel@redhat.com>,
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: [PATCH 00/27] Latest numa/core release, v16
Date: Wed, 21 Nov 2012 18:40:15 +0100 [thread overview]
Message-ID: <20121121174015.GA29331@gmail.com> (raw)
In-Reply-To: <20121121171047.GA28875@gmail.com>
* Ingo Molnar <mingo@kernel.org> wrote:
> So because I did not have an old-glibc system like David's, I
> did not know the actual page fault rate. If it is high enough
> then nonlinear effects might cause such effects.
>
> This is an entirely valid line of inquiry IMO.
Btw., when comparing against 'mainline' I routinely use a
vanilla kernel that has the same optimization applied. (first I
make sure it's not a regression to vanilla.)
I do that to factor out the linear component of the independent
speedup: it would not be valid to compare vanilla against
numa/core+optimization, but the comparison has to be:
vanilla + optimization
vs.
numa/core + optimization
I did that with last night's numbers as well.
So any of this can only address a regression if a non-linear
factor is in play.
Since I have no direct access to a regressing system I have to
work with the theories that I can think of: one had a larger
effect, the other had a smaller effect, the third one had no
effect on David's system.
How would you have done it instead?
Thanks,
Ingo
next prev parent reply other threads:[~2012-11-21 17:40 UTC|newest]
Thread overview: 204+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-19 2:14 [PATCH 00/27] Latest numa/core release, v16 Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 01/27] mm/generic: Only flush the local TLB in ptep_set_access_flags() Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 02/27] x86/mm: Only do a local tlb flush " Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 03/27] x86/mm: Introduce pte_accessible() Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 04/27] mm: Only flush the TLB when clearing an accessible pte Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 05/27] x86/mm: Completely drop the TLB flush from ptep_set_access_flags() Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 06/27] mm: Count the number of pages affected in change_protection() Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 07/27] mm: Optimize the TLB flush of sys_mprotect() and change_protection() users Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 08/27] sched, numa, mm: Add last_cpu to page flags Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 09/27] sched, mm, numa: Create generic NUMA fault infrastructure, with architectures overrides Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 10/27] sched: Make find_busiest_queue() a method Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 11/27] sched, numa, mm: Describe the NUMA scheduling problem formally Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 12/27] numa, mm: Support NUMA hinting page faults from gup/gup_fast Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 13/27] mm/migrate: Introduce migrate_misplaced_page() Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 14/27] sched, numa, mm, arch: Add variable locality exception Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 15/27] sched, numa, mm: Add credits for NUMA placement Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 16/27] sched, mm, x86: Add the ARCH_SUPPORTS_NUMA_BALANCING flag Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 17/27] sched, numa, mm: Add the scanning page fault machinery Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 18/27] sched: Add adaptive NUMA affinity support Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 19/27] sched: Implement constant, per task Working Set Sampling (WSS) rate Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 20/27] sched, numa, mm: Count WS scanning against present PTEs, not virtual memory ranges Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 21/27] sched: Implement slow start for working set sampling Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 22/27] sched, numa, mm: Interleave shared tasks Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 23/27] sched: Implement NUMA scanning backoff Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 24/27] sched: Improve convergence Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 25/27] sched: Introduce staged average NUMA faults Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 26/27] sched: Track groups of shared tasks Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 2:14 ` [PATCH 27/27] sched: Use the best-buddy 'ideal cpu' in balancing decisions Ingo Molnar
2012-11-19 2:14 ` Ingo Molnar
2012-11-19 16:29 ` [PATCH 00/27] Latest numa/core release, v16 Mel Gorman
2012-11-19 16:29 ` Mel Gorman
2012-11-19 19:13 ` Ingo Molnar
2012-11-19 19:13 ` Ingo Molnar
2012-11-19 21:18 ` Mel Gorman
2012-11-19 21:18 ` Mel Gorman
2012-11-19 22:36 ` Ingo Molnar
2012-11-19 22:36 ` Ingo Molnar
2012-11-19 23:00 ` Mel Gorman
2012-11-19 23:00 ` Mel Gorman
2012-11-20 0:41 ` Rik van Riel
2012-11-20 0:41 ` Rik van Riel
2012-11-21 10:58 ` Mel Gorman
2012-11-21 10:58 ` Mel Gorman
2012-11-20 1:02 ` Linus Torvalds
2012-11-20 1:02 ` Linus Torvalds
2012-11-20 7:17 ` Ingo Molnar
2012-11-20 7:17 ` Ingo Molnar
2012-11-20 7:37 ` David Rientjes
2012-11-20 7:37 ` David Rientjes
2012-11-20 7:48 ` Ingo Molnar
2012-11-20 7:48 ` Ingo Molnar
2012-11-20 8:01 ` Ingo Molnar
2012-11-20 8:01 ` Ingo Molnar
2012-11-20 8:11 ` David Rientjes
2012-11-20 8:11 ` David Rientjes
2012-11-21 11:14 ` Mel Gorman
2012-11-21 11:14 ` Mel Gorman
2012-11-20 10:20 ` Mel Gorman
2012-11-20 10:20 ` Mel Gorman
2012-11-20 10:47 ` Mel Gorman
2012-11-20 10:47 ` Mel Gorman
2012-11-20 15:29 ` [PATCH] mm, numa: Turn 4K pte NUMA faults into effective hugepage ones Ingo Molnar
2012-11-20 15:29 ` Ingo Molnar
2012-11-20 16:09 ` [PATCH, v2] " Ingo Molnar
2012-11-20 16:09 ` Ingo Molnar
2012-11-20 16:31 ` Rik van Riel
2012-11-20 16:31 ` Rik van Riel
2012-11-20 16:52 ` Ingo Molnar
2012-11-20 16:52 ` Ingo Molnar
2012-11-21 12:08 ` Mel Gorman
2012-11-21 12:08 ` Mel Gorman
2012-11-21 8:12 ` Ingo Molnar
2012-11-21 8:12 ` Ingo Molnar
2012-11-21 2:41 ` David Rientjes
2012-11-21 2:41 ` David Rientjes
2012-11-21 9:34 ` Ingo Molnar
2012-11-21 9:34 ` Ingo Molnar
2012-11-21 11:40 ` Mel Gorman
2012-11-21 11:40 ` Mel Gorman
2012-11-23 1:26 ` Alex Shi
2012-11-23 1:26 ` Alex Shi
2012-11-20 17:56 ` numa/core regressions fixed - more testers wanted Ingo Molnar
2012-11-20 17:56 ` Ingo Molnar
2012-11-21 1:54 ` Andrew Theurer
2012-11-21 1:54 ` Andrew Theurer
2012-11-21 3:22 ` Rik van Riel
2012-11-21 3:22 ` Rik van Riel
2012-11-21 4:10 ` Hugh Dickins
2012-11-21 4:10 ` Hugh Dickins
2012-11-21 12:45 ` Hillf Danton
2012-11-21 17:59 ` Andrew Theurer
2012-11-21 17:59 ` Andrew Theurer
2012-11-21 11:52 ` Mel Gorman
2012-11-21 11:52 ` Mel Gorman
2012-11-21 22:15 ` Andrew Theurer
2012-11-21 22:15 ` Andrew Theurer
2012-11-21 3:33 ` David Rientjes
2012-11-21 3:33 ` David Rientjes
2012-11-21 9:38 ` Ingo Molnar
2012-11-21 9:38 ` Ingo Molnar
2012-11-21 11:06 ` Ingo Molnar
2012-11-21 11:06 ` Ingo Molnar
2012-11-21 8:39 ` Alex Shi
2012-11-21 8:39 ` Alex Shi
2012-11-22 1:21 ` Ingo Molnar
2012-11-22 1:21 ` Ingo Molnar
2012-11-23 13:31 ` Ingo Molnar
2012-11-23 13:31 ` Ingo Molnar
2012-11-23 15:23 ` Alex Shi
2012-11-23 15:23 ` Alex Shi
2012-11-26 2:11 ` Alex Shi
2012-11-26 2:11 ` Alex Shi
2012-11-28 14:21 ` Alex Shi
2012-11-28 14:21 ` Alex Shi
2012-11-20 10:40 ` [PATCH 00/27] Latest numa/core release, v16 Ingo Molnar
2012-11-20 10:40 ` Ingo Molnar
2012-11-20 11:40 ` Mel Gorman
2012-11-20 11:40 ` Mel Gorman
2012-11-21 10:38 ` Mel Gorman
2012-11-21 10:38 ` Mel Gorman
2012-11-21 19:37 ` Andrea Arcangeli
2012-11-21 19:37 ` Andrea Arcangeli
2012-11-21 19:56 ` Mel Gorman
2012-11-21 19:56 ` Mel Gorman
2012-11-19 20:07 ` Ingo Molnar
2012-11-19 20:07 ` Ingo Molnar
2012-11-19 21:37 ` Mel Gorman
2012-11-19 21:37 ` Mel Gorman
2012-11-20 0:50 ` David Rientjes
2012-11-20 0:50 ` David Rientjes
2012-11-20 1:05 ` David Rientjes
2012-11-20 1:05 ` David Rientjes
2012-11-20 6:00 ` Ingo Molnar
2012-11-20 6:00 ` Ingo Molnar
2012-11-20 6:20 ` David Rientjes
2012-11-20 6:20 ` David Rientjes
2012-11-20 7:44 ` Ingo Molnar
2012-11-20 7:44 ` Ingo Molnar
2012-11-20 7:48 ` Paul Turner
2012-11-20 7:48 ` Paul Turner
2012-11-20 8:20 ` David Rientjes
2012-11-20 8:20 ` David Rientjes
2012-11-20 9:06 ` Ingo Molnar
2012-11-20 9:06 ` Ingo Molnar
2012-11-20 9:41 ` [patch] x86/vsyscall: Add Kconfig option to use native vsyscalls, switch to it Ingo Molnar
2012-11-20 9:41 ` Ingo Molnar
2012-11-20 23:01 ` Andy Lutomirski
2012-11-20 23:01 ` Andy Lutomirski
2012-11-21 0:43 ` David Rientjes
2012-11-21 0:43 ` David Rientjes
2012-11-20 12:02 ` [PATCH] x86/mm: Don't flush the TLB on #WP pmd fixups Ingo Molnar
2012-11-20 12:02 ` Ingo Molnar
2012-11-20 12:31 ` Ingo Molnar
2012-11-20 12:31 ` Ingo Molnar
2012-11-21 11:47 ` Mel Gorman
2012-11-21 11:47 ` Mel Gorman
2012-11-21 1:22 ` David Rientjes
2012-11-21 1:22 ` David Rientjes
2012-11-22 23:22 ` [tip:x86/mm] " tip-bot for Ingo Molnar
2012-11-21 17:02 ` [PATCH 00/27] Latest numa/core release, v16 Linus Torvalds
2012-11-21 17:02 ` Linus Torvalds
2012-11-21 17:10 ` Ingo Molnar
2012-11-21 17:10 ` Ingo Molnar
2012-11-21 17:20 ` Ingo Molnar
2012-11-21 17:20 ` Ingo Molnar
2012-11-22 4:31 ` David Rientjes
2012-11-22 4:31 ` David Rientjes
2012-11-21 17:40 ` Ingo Molnar [this message]
2012-11-21 17:40 ` Ingo Molnar
2012-11-21 22:04 ` Linus Torvalds
2012-11-21 22:04 ` Linus Torvalds
2012-11-21 22:46 ` Ingo Molnar
2012-11-21 22:46 ` Ingo Molnar
2012-11-21 17:45 ` Rik van Riel
2012-11-21 17:45 ` Rik van Riel
2012-11-21 18:04 ` Ingo Molnar
2012-11-21 18:04 ` Ingo Molnar
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