From: Peter Zijlstra <peterz@infradead.org>
To: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
David Miller <davem@davemloft.net>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Russell King <rmk@arm.linux.org.uk>,
Paul Mundt <lethal@linux-sh.org>, Jeff Dike <jdike@addtoit.com>,
Richard Weinberger <richard@nod.at>,
Tony Luck <tony.luck@intel.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Mel Gorman <mel@csn.ul.ie>, Nick Piggin <npiggin@kernel.dk>,
Namhyung Kim <namhyung@gmail.com>,
ak@linux.intel.com, shaohua.li@intel.com, alex.shi@intel.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
"Rafael J. Wysocki" <rjw@sisk.pl>,
paulmck <paulmck@linux.vnet.ibm.com>
Subject: Re: REGRESSION: Performance regressions from switching anon_vma->lock to mutex
Date: Wed, 15 Jun 2011 13:41:31 +0200 [thread overview]
Message-ID: <1308138091.15315.50.camel@twins> (raw)
In-Reply-To: <1308135495.15315.38.camel@twins>
On Wed, 2011-06-15 at 12:58 +0200, Peter Zijlstra wrote:
> On Wed, 2011-06-15 at 12:36 +0200, Peter Zijlstra wrote:
> > On Tue, 2011-06-14 at 17:29 -0700, Tim Chen wrote:
> > > MOSBENCH test suite.
> >
> > Argh, I'm trying to get this thing to run, but its all snake poo..
> >
> > /me takes up a heavy club and goes snake hunting, should make a pretty
> > hat or something.
>
> Sweet, I've got meself a snake-skin hat!
>
> The first thing that stood out when running it was:
>
> 31694 root 20 0 26660 1460 1212 S 17.5 0.0 0:01.97 exim
> 7 root -2 19 0 0 0 S 12.7 0.0 0:06.14 rcuc0
> 24 root -2 19 0 0 0 S 11.7 0.0 0:04.15 rcuc3
> 34 root -2 19 0 0 0 S 11.7 0.0 0:04.10 rcuc5
> 39 root -2 19 0 0 0 S 11.7 0.0 0:06.38 rcuc6
> 44 root -2 19 0 0 0 S 11.7 0.0 0:04.53 rcuc7
> 49 root -2 19 0 0 0 S 11.7 0.0 0:04.11 rcuc8
> 79 root -2 19 0 0 0 S 11.7 0.0 0:03.91 rcuc14
> 89 root -2 19 0 0 0 S 11.7 0.0 0:03.90 rcuc16
> 110 root -2 19 0 0 0 S 11.7 0.0 0:03.90 rcuc20
> 120 root -2 19 0 0 0 S 11.7 0.0 0:03.82 rcuc22
> 13 root -2 19 0 0 0 S 10.7 0.0 0:04.37 rcuc1
> 19 root -2 19 0 0 0 S 10.7 0.0 0:04.19 rcuc2
> 29 root -2 19 0 0 0 S 10.7 0.0 0:04.12 rcuc4
> 54 root -2 19 0 0 0 S 10.7 0.0 0:04.11 rcuc9
> 59 root -2 19 0 0 0 S 10.7 0.0 0:04.40 rcuc10
> 64 root -2 19 0 0 0 R 10.7 0.0 0:04.17 rcuc11
> 69 root -2 19 0 0 0 R 10.7 0.0 0:04.23 rcuc12
> 84 root -2 19 0 0 0 S 10.7 0.0 0:03.90 rcuc15
> 95 root -2 19 0 0 0 S 10.7 0.0 0:03.99 rcuc17
> 100 root -2 19 0 0 0 S 10.7 0.0 0:03.88 rcuc18
> 105 root -2 19 0 0 0 S 10.7 0.0 0:04.14 rcuc19
> 125 root -2 19 0 0 0 S 10.7 0.0 0:03.79 rcuc23
> 74 root -2 19 0 0 0 S 9.7 0.0 0:04.33 rcuc13
> 115 root -2 19 0 0 0 R 9.7 0.0 0:03.82 rcuc21
>
> Which is an impressive amount of RCU usage..
FWIW, Alex Shi's patch:
http://lkml.kernel.org/r/1308029185.15392.147.camel@sli10-conroe
Improves the situation to:
3745 root 20 0 26664 1460 1212 S 18.5 0.0 0:01.28 exim
39 root -2 19 0 0 0 S 4.9 0.0 0:02.83 rcuc6
105 root -2 19 0 0 0 S 4.9 0.0 0:02.79 rcuc19
7 root -2 19 0 0 0 S 3.9 0.0 0:02.70 rcuc0
13 root -2 19 0 0 0 S 3.9 0.0 0:02.54 rcuc1
19 root -2 19 0 0 0 S 3.9 0.0 0:02.76 rcuc2
24 root -2 19 0 0 0 S 3.9 0.0 0:02.75 rcuc3
...
And throughput increases like:
-tip 260.092 messages/sec/core
-tip+sirq-rcu 271.078 messages/sec/core
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next prev parent reply other threads:[~2011-06-15 11:42 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-15 0:29 REGRESSION: Performance regressions from switching anon_vma->lock to mutex Tim Chen
2011-06-15 0:36 ` Andi Kleen
2011-06-17 19:07 ` Ingo Molnar
2011-06-15 1:21 ` Linus Torvalds
2011-06-15 3:42 ` Linus Torvalds
2011-06-15 1:26 ` Shaohua Li
2011-06-15 11:52 ` Peter Zijlstra
2011-06-15 12:49 ` Peter Zijlstra
2011-06-15 16:18 ` Andi Kleen
2011-06-15 16:45 ` Peter Zijlstra
2011-06-15 16:47 ` Andi Kleen
2011-06-15 18:43 ` Tim Chen
2011-06-15 20:32 ` Peter Zijlstra
2011-06-15 20:57 ` Andi Kleen
2011-06-15 21:12 ` Tim Chen
2011-06-15 21:37 ` Peter Zijlstra
2011-06-15 21:51 ` Linus Torvalds
2011-06-15 22:19 ` Andi Kleen
2011-06-16 0:16 ` Linus Torvalds
2011-06-16 20:14 ` Andi Kleen
2011-06-16 20:37 ` Linus Torvalds
2011-06-17 0:24 ` Andi Kleen
2011-06-17 9:13 ` Ingo Molnar
2011-06-15 22:15 ` Andi Kleen
2011-06-16 1:08 ` Tim Chen
2011-06-16 1:50 ` Linus Torvalds
2011-06-16 20:26 ` Tim Chen
2011-06-16 20:47 ` Linus Torvalds
2011-06-16 21:05 ` Linus Torvalds
2011-06-16 21:06 ` Linus Torvalds
2011-06-16 21:26 ` Linus Torvalds
2011-06-17 3:58 ` Linus Torvalds
2011-06-17 11:28 ` Peter Zijlstra
2011-06-17 11:54 ` Peter Zijlstra
2011-06-17 16:36 ` Linus Torvalds
2011-06-17 17:41 ` Hugh Dickins
2011-06-17 17:55 ` Peter Zijlstra
2011-06-17 18:01 ` Linus Torvalds
2011-06-17 18:18 ` Peter Zijlstra
2011-06-17 18:32 ` Peter Zijlstra
2011-06-17 18:39 ` Linus Torvalds
2011-06-17 18:41 ` Linus Torvalds
2011-06-17 20:19 ` Tim Chen
2011-06-17 22:20 ` Hugh Dickins
2011-06-18 4:47 ` Linus Torvalds
2011-06-17 19:53 ` [PATCH] mm, memory-failure: Fix spinlock vs mutex order Peter Zijlstra
2011-06-17 20:04 ` Andi Kleen
2011-06-17 16:46 ` REGRESSION: Performance regressions from switching anon_vma->lock to mutex Linus Torvalds
2011-06-17 17:28 ` Linus Torvalds
2011-06-17 19:40 ` Andi Kleen
2011-06-18 8:08 ` Ingo Molnar
2011-06-17 18:22 ` Tim Chen
2011-06-17 19:05 ` Ray Lee
2011-06-16 22:00 ` Andi Kleen
2011-06-15 10:36 ` Peter Zijlstra
2011-06-15 10:58 ` Peter Zijlstra
2011-06-15 11:41 ` Peter Zijlstra [this message]
2011-06-15 19:11 ` Linus Torvalds
2011-06-15 19:24 ` Andrew Morton
2011-06-15 20:16 ` Ingo Molnar
2011-06-15 20:55 ` Linus Torvalds
2011-06-15 20:12 ` [GIT PULL] " Ingo Molnar
2011-06-15 20:29 ` Paul E. McKenney
2011-06-15 20:47 ` Linus Torvalds
2011-06-15 20:54 ` Paul E. McKenney
2011-06-15 21:05 ` Linus Torvalds
2011-06-15 21:15 ` Paul E. McKenney
2011-06-15 21:27 ` Linus Torvalds
2011-06-16 7:03 ` Ingo Molnar
2011-06-16 17:16 ` Paul E. McKenney
2011-06-16 20:25 ` Ingo Molnar
2011-06-16 21:01 ` Frederic Weisbecker
2011-06-16 23:02 ` Ingo Molnar
2011-06-17 15:19 ` Frederic Weisbecker
2011-06-16 21:02 ` Andi Kleen
2011-06-16 22:21 ` Benjamin Herrenschmidt
2011-06-16 22:38 ` Ingo Molnar
2011-06-16 22:47 ` Andi Kleen
2011-06-16 22:58 ` Ingo Molnar
2011-06-17 0:45 ` Paul E. McKenney
2011-06-17 9:43 ` Ingo Molnar
2011-06-17 16:48 ` Paul E. McKenney
2011-06-16 23:37 ` Paul E. McKenney
2011-06-15 20:13 ` Tim Chen
2011-06-15 20:17 ` Ingo Molnar
2011-06-15 20:21 ` Tim Chen
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