Re: REGRESSION: Performance regressions from switching anon_vma->lock to mutex
From: Peter Zijlstra <peterz@infradead.org>
Date: 2011-06-15 11:43:06
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On Wed, 2011-06-15 at 12:58 +0200, Peter Zijlstra wrote:
On Wed, 2011-06-15 at 12:36 +0200, Peter Zijlstra wrote:quoted
On Tue, 2011-06-14 at 17:29 -0700, Tim Chen wrote:quoted
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 -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>