linux-kernel - Re: [RFC][PATCH 14/26] sched, numa: Numa balancer

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Message-ID: <1341837624.3462.68.camel@twins>
Date:	Mon, 09 Jul 2012 14:40:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dan Smith <danms@...ibm.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 14/26] sched, numa: Numa balancer

On Mon, 2012-07-09 at 14:23 +0200, Peter Zijlstra wrote:
> > It is not yet clear to me how and why your code converges.
> 
> I don't think it does.. but since the scheduler interaction is fairly
> weak it doesn't matter too much from that pov.
> 
That is,.. it slowly moves along with the cpu usage, only if there's a
lot of remote memory allocations (memory pressure) things get funny. 

It'll try and rotate all tasks around a bit trying, but there's no good
solution for a memory hole on one node and a cpu hole on another, you're
going to have to take the remote hits.

Again.. what do we want it to do?
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