linux-kernel - Re: [RFC][PATCH 00/26] sched/numa

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Message-ID: <20120319142046.GP24602@redhat.com>
Date:	Mon, 19 Mar 2012 15:20:46 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Avi Kivity <avi@...hat.com>,
	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>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 00/26] sched/numa

On Mon, Mar 19, 2012 at 02:39:31PM +0100, Peter Zijlstra wrote:
> On Mon, 2012-03-19 at 14:04 +0100, Andrea Arcangeli wrote:
> > In implementation terms the scheduler is simplified and it won't work
> > as well as it should with massive CPU overcommit. But I had to take
> > shortcuts to keep the complexity down to O(N) where N is the number of
> > CPUS 
> 
> Yeah I saw that, you essentially put a nr_cpus loop inside schedule(),
> obviously that's not going to ever happen.

lol Would be fun if such a simplification would still perform better
than your code :).

Yeah I'll try to fix that but it's massively complex and frankly
benchmarking wise it won't help much fixing that... so it's beyond the
end of my todo list.
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