linux-kernel - [RFC PATCH 0/2] sched: simplify the select_task_rq

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Date:	Fri, 11 Jan 2013 16:15:37 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Turner <pjt@...gle.com>, Tejun Heo <tj@...nel.org>,
	Mike Galbraith <efault@....de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair()

This patch set is trying to simplify the select_task_rq_fair() with
schedule balance map.

After get rid of the complex code and reorganize the logical, pgbench show
the improvement.

	Prev:
		| db_size | clients |  tps  |
		+---------+---------+-------+
		| 22 MB   |       1 |  4437 |
		| 22 MB   |      16 | 51351 |
		| 22 MB   |      32 | 49959 |
		| 7484 MB |       1 |  4078 |
		| 7484 MB |      16 | 44681 |
		| 7484 MB |      32 | 42463 |
		| 15 GB   |       1 |  3992 |
		| 15 GB   |      16 | 44107 |
		| 15 GB   |      32 | 41797 |

	Post:
		| db_size | clients |  tps  |
		+---------+---------+-------+
		| 22 MB   |       1 | 11053 |		+149.11%
		| 22 MB   |      16 | 55671 |		+8.41%
		| 22 MB   |      32 | 52596 |		+5.28%
		| 7483 MB |       1 |  8180 |		+100.59%
		| 7483 MB |      16 | 48392 |		+8.31%
		| 7483 MB |      32 | 44185 |		+0.18%
		| 15 GB   |       1 |  8127 |		+103.58%
		| 15 GB   |      16 | 48156 |		+9.18%
		| 15 GB   |      32 | 43387 |		+3.8%

Please check the patch for more details about schedule balance map, they
currently based on linux-next 3.7.0-rc6, will rebase them to tip tree in
follow version.

Comments are very welcomed.

Test with:
	12 cpu X86 server and linux-next 3.7.0-rc6.

Michael Wang (2):
	[PATCH 1/2] sched: schedule balance map foundation
	[PATCH 2/2] sched: simplify select_task_rq_fair() with schedule balance map

Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
---
 core.c  |   61 +++++++++++++++++++++++++++++
 fair.c  |  133 +++++++++++++++++++++++++++++++++-------------------------------
 sched.h |   28 +++++++++++++
 3 files changed, 159 insertions(+), 63 deletions(-)

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