linux-kernel - Re: [RFC] AutoNUMA alpha6

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Message-ID: <20120325133027.GG5906@redhat.com>
Date:	Sun, 25 Mar 2012 15:30:27 +0200
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,
	Hillf Danton <dhillf@...il.com>
Subject: Re: [RFC] AutoNUMA alpha6

On Thu, Mar 22, 2012 at 11:56:37AM -0700, Dan Smith wrote:
> I dunno about everyone else, but I think the thing I'd like to see most
> (other than more interesting benchmarks) is a broken out and documented
> set of patches instead of the monolithic commit you have now. I know you
> weren't probably planning to do that until numasched came along, but it
> sure would help me digest the differences in the two approaches.

Ok this is a start. I'll have to review it again tomorrow and add more
docs before I can do proper submit by email. If you're willing to
contribute you can review it already using "git format-patch 9ca11f1"
after fetching the repo. Comments welcome!

git clone --reference linux -b autonuma-dev-smt git://git.kernel.org/pub/scm/linux/kernel/git/andaa.git

The last patch in that branch is the last feature I worked on
yesterday and it fixes the SMT load with numa02.c modified to use only
1 thread per core, which means changing THREADS from 24 to 12 in the
numa02.c source at the top (and then building it again in the
-DHARD_BIND and -DHARD_BIND -DINVERSE_BIND versions to compare with
autonuma on and off). It also fixes building the kernel in a loop in
KVM with 12 vcpus (now the load spreads over the two nodes). echo 0
>/sys/kernel/mm/autonuma/scheduler/smt would disable the SMT
awareness.
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