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Subject: Re: [RFC][PATCH 00/26] sched/numa
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Avi Kivity <avi@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
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        Suresh Siddha <suresh.b.siddha@intel.com>,
        Mike Galbraith <efault@gmx.de>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Lai Jiangshan <laijs@cn.fujitsu.com>, Dan Smith <danms@us.ibm.com>,
        Bharata B Rao <bharata.rao@gmail.com>,
        Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
        Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
Date: Mon, 19 Mar 2012 15:07:59 +0100
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On Mon, 2012-03-19 at 14:57 +0100, Andrea Arcangeli wrote:
> If you buy that kind of
> hardware losing the cost of 0.5% of RAM of it, is ridiculous compared
> to the programmer cost of patching all apps. 

What all apps? Only apps that are larger than a single node need
patching.

And no, I really don't think giving up 0.5% of RAM is acceptable.