linux-kernel - Re: [PATCH] sched,numa: document and fix numa_preferred

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Message-ID: <20150618161230.GA5799@gmail.com>
Date:	Thu, 18 Jun 2015 18:12:30 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	peterz@...radead.org, mgorman@...e.de
Subject: Re: [PATCH] sched,numa: document and fix numa_preferred_nid setting


* Srikar Dronamraju <srikar@...ux.vnet.ibm.com> wrote:

> >  	if (p->numa_group) {
> >  		if (env.best_cpu == -1)
> > @@ -1513,7 +1520,7 @@ static int task_numa_migrate(struct task_struct *p)
> >  			nid = env.dst_nid;
> > 
> >  		if (node_isset(nid, p->numa_group->active_nodes))
> > -			sched_setnuma(p, env.dst_nid);
> > +			sched_setnuma(p, nid);
> >  	}
> > 
> >  	/* No better CPU than the current one was found. */
> > 
> 
> Overall this patch does seem to produce better results. However numa02
> gets affected -vely.

Huh?

numa02 is the more important benchmark of the two. 'numa01' is a conflicting 
workload that is a lot more sensitive to balancing details - while 'numa02' is a 
nicely partitioned workload that should converge as fast as possible.

So if numa02 got worse then it's a bad change.

Thanks,

	Ingo
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