linux-kernel - [tip:sched/balancing] sched: Turn on SD_BALANCE

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Message-ID: <tip-840a0653100dbde599ae8ddf83fa214dfa5fd1aa@git.kernel.org>
Date:	Fri, 4 Sep 2009 10:25:30 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, ego@...ibm.com, hpa@...or.com,
	mingo@...hat.com, andreas.herrmann3@....com,
	a.p.zijlstra@...llo.nl, balbir@...ibm.com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:sched/balancing] sched: Turn on SD_BALANCE_NEWIDLE

Commit-ID:  840a0653100dbde599ae8ddf83fa214dfa5fd1aa
Gitweb:     http://git.kernel.org/tip/840a0653100dbde599ae8ddf83fa214dfa5fd1aa
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Fri, 4 Sep 2009 11:32:54 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 4 Sep 2009 11:52:54 +0200

sched: Turn on SD_BALANCE_NEWIDLE

Start the re-tuning of the balancer by turning on newidle.

It improves hackbench performance and parallelism on a 4x4 box.
The "perf stat --repeat 10" measurements give us:

  domain0             domain1
  .......................................
 -SD_BALANCE_NEWIDLE -SD_BALANCE_NEWIDLE:
   2041.273208  task-clock-msecs         #      9.354 CPUs    ( +-   0.363% )

 +SD_BALANCE_NEWIDLE -SD_BALANCE_NEWIDLE:
   2086.326925  task-clock-msecs         #     11.934 CPUs    ( +-   0.301% )

 +SD_BALANCE_NEWIDLE +SD_BALANCE_NEWIDLE:
   2115.289791  task-clock-msecs         #     12.158 CPUs    ( +-   0.263% )

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Andreas Herrmann <andreas.herrmann3@....com>
Cc: Andreas Herrmann <andreas.herrmann3@....com>
Cc: Gautham R Shenoy <ego@...ibm.com>
Cc: Balbir Singh <balbir@...ibm.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/include/asm/topology.h |    2 +-
 include/linux/topology.h        |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index be29eb8..ef7bc7f 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -142,7 +142,7 @@ extern unsigned long node_remap_size[];
 	.forkexec_idx		= SD_FORKEXEC_IDX,			\
 									\
 	.flags			= 1*SD_LOAD_BALANCE			\
-				| 0*SD_BALANCE_NEWIDLE			\
+				| 1*SD_BALANCE_NEWIDLE			\
 				| 1*SD_BALANCE_EXEC			\
 				| 1*SD_BALANCE_FORK			\
 				| 0*SD_WAKE_IDLE			\
diff --git a/include/linux/topology.h b/include/linux/topology.h
index fe2c032..66774fd 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -126,7 +126,7 @@ int arch_update_cpu_topology(void);
 	.forkexec_idx		= 1,					\
 									\
 	.flags			= 1*SD_LOAD_BALANCE			\
-				| 0*SD_BALANCE_NEWIDLE			\
+				| 1*SD_BALANCE_NEWIDLE			\
 				| 1*SD_BALANCE_EXEC			\
 				| 1*SD_BALANCE_FORK			\
 				| 0*SD_WAKE_IDLE			\
@@ -160,7 +160,7 @@ int arch_update_cpu_topology(void);
 	.forkexec_idx		= 1,					\
 									\
 	.flags			= 1*SD_LOAD_BALANCE			\
-				| 0*SD_BALANCE_NEWIDLE			\
+				| 1*SD_BALANCE_NEWIDLE			\
 				| 1*SD_BALANCE_EXEC			\
 				| 1*SD_BALANCE_FORK			\
 				| 0*SD_WAKE_IDLE			\
--
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