linux-kernel - Re: [RFC] AutoNUMA alpha6

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Message-ID: <20120322001722.GQ24602@redhat.com>
Date:	Thu, 22 Mar 2012 01:17:22 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Dan Smith <danms@...ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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>,
	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] AutoNUMA alpha6

On Wed, Mar 21, 2012 at 11:52:42PM +0100, Andrea Arcangeli wrote:
> Your three numbers of mainline looked ok, it's still strange that
> numa01_same_node is identical to numa01_inverse_bind though. It
> shoudln't. same_node uses 1 numa node. inverse uses both nodes but

The only reasonable explanation I can imagine for the weird stuff
going on with "numa01_inverse" is that maybe it was compiled without
-DHARD_BIND? I forgot to specify -DINVERSE_BIND is a noop unless
-DHARD_BIND is specified too at the same time. -DINVERSE_BIND alone
results in the default build without -D parameters.

Now AutoNUMA has a bug and is real inverse bind too, I need to fix that.

In the meantime this is possible:

echo 0 >/sys/kernel/mm/autonuma/enabled
run numa01_inverse
echo 1 >/sys/kernel/mm/autonuma/enabled
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