linux-kernel - Re: Performance regression of specjbb2005/aim7 with 2.6.29-rc1

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Message-Id: <1232066983.4923.5.camel@minggr.sh.intel.com>
Date:	Fri, 16 Jan 2009 08:49:43 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <efault@....de>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	"dev@...sonking.com" <dev@...sonking.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Performance regression of specjbb2005/aim7 with 2.6.29-rc1

On Fri, 2009-01-16 at 00:17 +0800, Peter Zijlstra wrote:
> On Thu, 2009-01-15 at 10:30 +0800, Lin Ming wrote:
> 
> > Below patch fixes aim7 regression and specjbb2005 regression becomes
> > less than 1.5% on 8-core stokley.
> 
> Ingo, please apply the below.
> 
> Ming, would you also provide a S-o-b line?

Yes,

Signed-off-by: Lin Ming <ming.m.lin@...el.com>

Lin Ming

> 
> ---
> Subject: sched_slice fixlet
> From: Lin Ming <ming.m.lin@...el.com>
> Date: Thu Jan 15 17:10:02 CET 2009
> 
> Mike's change: 0a582440f -- sched: fix sched_slice())
> Broke group scheduling by forgetting to reload cfs_rq on each loop.
> 
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  kernel/sched_fair.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6/kernel/sched_fair.c
> ===================================================================
> --- linux-2.6.orig/kernel/sched_fair.c
> +++ linux-2.6/kernel/sched_fair.c
> @@ -429,7 +429,10 @@ static u64 sched_slice(struct cfs_rq *cf
>  	u64 slice = __sched_period(cfs_rq->nr_running + !se->on_rq);
>  
>  	for_each_sched_entity(se) {
> -		struct load_weight *load = &cfs_rq->load;
> +		struct load_weight *load;
> +
> +		cfs_rq = cfs_rq_of(se);
> +		load = &cfs_rq->load;
>  
>  		if (unlikely(!se->on_rq)) {
>  			struct load_weight lw = cfs_rq->load;
> 
> 

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