linux-kernel - Re: [PATCH 0/5] ppc64 scheduler fixes

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Date:	Tue, 20 Sep 2011 11:38:48 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Anton Blanchard <anton@...ba.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] ppc64 scheduler fixes

On Tue, 2011-09-20 at 10:19 +1000, Anton Blanchard wrote:
> Hi Peter,
> 
> > On Mon, 2011-07-25 at 12:33 +1000, Anton Blanchard wrote:
> > > Here are a set of ppc64 scheduler fixes that help with some
> > > multi node performance issues.
> > 
> > They look fine to me. I'll probably ping you when I'll rip out all
> > that SD_NODES_PER_DOMAIN crap for good, but until then I'm fine with
> > you fiddling it for ppc64.
> > 
> > Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> 
> Are you OK if Ben takes this, or would you prefer to send it via the
> scheduler tree?

I've already put it in my next branch that I'll stick on github later
today hopefully :-)

Cheers,
Ben.
 
> Anton
> --
> 
> [2/5] sched: Allow SD_NODES_PER_DOMAIN to be overridden
> 
> We want to override the default value of SD_NODES_PER_DOMAIN on ppc64,
> so move it into linux/topology.h.
> 
> Signed-off-by: Anton Blanchard <anton@...ba.org>
> 
> ---
> 
> Index: linux-2.6-work/include/linux/topology.h
> ===================================================================
> --- linux-2.6-work.orig/include/linux/topology.h	2011-07-25 11:20:02.588717796 +1000
> +++ linux-2.6-work/include/linux/topology.h	2011-07-25 11:26:50.616468376 +1000
> @@ -201,6 +201,10 @@ int arch_update_cpu_topology(void);
>  	.balance_interval	= 64,					\
>  }
>  
> +#ifndef SD_NODES_PER_DOMAIN
> +#define SD_NODES_PER_DOMAIN 16
> +#endif
> +
>  #ifdef CONFIG_SCHED_BOOK
>  #ifndef SD_BOOK_INIT
>  #error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!!
> Index: linux-2.6-work/kernel/sched.c
> ===================================================================
> --- linux-2.6-work.orig/kernel/sched.c	2011-07-25 11:20:09.538850173 +1000
> +++ linux-2.6-work/kernel/sched.c	2011-07-25 11:26:50.626468565 +1000
> @@ -6938,8 +6938,6 @@ static int __init isolated_cpu_setup(cha
>  
>  __setup("isolcpus=", isolated_cpu_setup);
>  
> -#define SD_NODES_PER_DOMAIN 16
> -
>  #ifdef CONFIG_NUMA
>  
>  /**
> --
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