linux-kernel - Re: VolanoMark regression with 2.6.27-rc1

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Date:	Wed, 20 Aug 2008 18:32:09 +0400
From:	adobriyan@...il.com
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Aneesh Kumar KV <aneesh.kumar@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Chris Friesen <cfriesen@...tel.com>
Subject: Re: VolanoMark regression with 2.6.27-rc1

On Wed, Aug 20, 2008 at 03:32:17PM +0200, Peter Zijlstra wrote:
> On Wed, 2008-08-20 at 12:51 +0200, Ingo Molnar wrote:
> > * Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> > 
> > > And I must admit to having overlooked the effect on wake_affine..
> > > 
> > > Chris, could you see the effect of this on smp group fairness?
> 
> Just realized my brainfart..
> 
> ---
> Subject: sched: load-balance bias fixes
> From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Date: Wed Aug 20 15:28:51 CEST 2008
> 
> Yanmin spotted a regression with my patch that introduces LB_BIAS:
> 
>   commit 93b75217df39e6d75889cc6f8050343286aff4a5
>   Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
>   Date:   Fri Jun 27 13:41:33 2008 +0200
> 
> And I just spotted the brainfart - I should have replaced min/max with avg
> instead of removing it completely.

> --- linux-2.6.orig/include/linux/kernel.h
> +++ linux-2.6/include/linux/kernel.h
> @@ -367,6 +367,12 @@ static inline char *pack_hex_byte(char *
>  	(void) (&_max1 == &_max2);		\
>  	_max1 > _max2 ? _max1 : _max2; })
>  
> +#define avg(x, y) ({				\
> +	typeof(x) _avg1 = ((x)+1)/2;		\
> +	typeof(x) _avg2 = ((y)+1)/2;		\

ITYM, typeof(y)

> +	(void) (&_avg1 == &_avg2);		\
> +	_avg1 + _avg2; })

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