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

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Message-ID: <50ED384C.1030301@linux.vnet.ibm.com>
Date:	Wed, 09 Jan 2013 17:28:44 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
CC:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	peterz@...radead.org, mingo@...nel.org, a.p.zijlstra@...llo.nl
Subject: Re: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair()

On 12/27/2012 02:08 PM, Michael Wang wrote:
> 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.

Could I get some comments for this patch set?

Regards,
Michael Wang

> 
> 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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