linux-kernel - Re: REGRESSION: Performance regressions from switching anon

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Date:	Wed, 15 Jun 2011 12:58:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Russell King <rmk@....linux.org.uk>,
	Paul Mundt <lethal@...ux-sh.org>,
	Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>,
	Tony Luck <tony.luck@...el.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, Nick Piggin <npiggin@...nel.dk>,
	Namhyung Kim <namhyung@...il.com>, ak@...ux.intel.com,
	shaohua.li@...el.com, alex.shi@...el.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: REGRESSION: Performance regressions from switching
 anon_vma->lock to mutex

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..
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