linux-kernel - Re: [RFC PATCH 07/16 v3] Init Workload Consolidation flags in sched

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Date:	Tue, 3 Jun 2014 14:14:16 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Yuyang Du <yuyang.du@...el.com>
Cc:	mingo@...hat.com, rafael.j.wysocki@...el.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	arjan.van.de.ven@...el.com, len.brown@...el.com,
	alan.cox@...el.com, mark.gross@...el.com, pjt@...gle.com,
	bsegall@...gle.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org, rajeev.d.muralidhar@...el.com,
	vishwesh.m.rudramuni@...el.com, nicole.chalhoub@...el.com,
	ajaya.durg@...el.com, harinarayanan.seshadri@...el.com,
	jacob.jun.pan@...ux.intel.com, fengguang.wu@...el.com
Subject: Re: [RFC PATCH 07/16 v3] Init Workload Consolidation flags in
 sched_domain

On Fri, May 30, 2014 at 02:36:03PM +0800, Yuyang Du wrote:
> Workload Consolidation can be enabled/disabled on the fly. This patchset
> enables MC and CPU domain WC by default.
> 
> To enable CPU WC (SD_WORKLOAD_CONSOLIDATION=0x8000):
> 
> sysctl -w kernel.sched_domain.cpuX.domainY.flags += 0x8000
> 
> To disable CPU WC:
> 
> sysctl -w kernel.sched_domain.cpuX.domainY.flags -= 0x8000
> 
> Signed-off-by: Yuyang Du <yuyang.du@...el.com>
> ---
>  include/linux/topology.h |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/topology.h b/include/linux/topology.h
> index 7062330..ebc339c3 100644
> --- a/include/linux/topology.h
> +++ b/include/linux/topology.h
> @@ -102,12 +102,14 @@ int arch_update_cpu_topology(void);
>  				| 0*SD_SERIALIZE			\
>  				| 0*SD_PREFER_SIBLING			\
>  				| arch_sd_sibling_asym_packing()	\
> +				| 0*SD_WORKLOAD_CONSOLIDATION	\
>  				,					\
>  	.last_balance		= jiffies,				\
>  	.balance_interval	= 1,					\
>  	.smt_gain		= 1178,	/* 15% */			\
>  	.max_newidle_lb_cost	= 0,					\
>  	.next_decay_max_lb_cost	= jiffies,				\
> +	.consolidating_coeff = 0,					\
>  }
>  #endif
>  #endif /* CONFIG_SCHED_SMT */
> @@ -134,11 +136,13 @@ int arch_update_cpu_topology(void);
>  				| 0*SD_SHARE_CPUPOWER			\
>  				| 1*SD_SHARE_PKG_RESOURCES		\
>  				| 0*SD_SERIALIZE			\
> +				| 1*SD_WORKLOAD_CONSOLIDATION	\
>  				,					\
>  	.last_balance		= jiffies,				\
>  	.balance_interval	= 1,					\
>  	.max_newidle_lb_cost	= 0,					\
>  	.next_decay_max_lb_cost	= jiffies,				\
> +	.consolidating_coeff = 180,					\
>  }
>  #endif
>  #endif /* CONFIG_SCHED_MC */
> @@ -167,11 +171,13 @@ int arch_update_cpu_topology(void);
>  				| 0*SD_SHARE_PKG_RESOURCES		\
>  				| 0*SD_SERIALIZE			\
>  				| 1*SD_PREFER_SIBLING			\
> +				| 1*SD_WORKLOAD_CONSOLIDATION	\
>  				,					\
>  	.last_balance		= jiffies,				\
>  	.balance_interval	= 1,					\
>  	.max_newidle_lb_cost	= 0,					\
>  	.next_decay_max_lb_cost	= jiffies,				\
> +	.consolidating_coeff = 180,					\
>  }
>  #endif

What tree are you working against, non of that exists anymore. Also, you
cannot unconditionally set this.

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