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Date: Mon, 28 Jan 2013 15:54:52 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Hugh Dickins <hughd@google.com>
Cc: Petr Holasek <pholasek@redhat.com>, Andrea Arcangeli <aarcange@redhat.com>,
        Izik Eidus <izik.eidus@ravellosystems.com>,
        Rik van Riel <riel@redhat.com>, David Rientjes <rientjes@google.com>,
        Anton Arapov <anton@redhat.com>, Mel Gorman <mgorman@suse.de>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 0/11] ksm: NUMA trees and page migration
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On Fri, 25 Jan 2013 17:53:10 -0800 (PST)
Hugh Dickins <hughd@google.com> wrote:

> Here's a KSM series

Sanity check: do you have a feeling for how useful KSM is? 
Performance/space improvements for typical (or atypical) workloads? 
Are people using it?  Successfully?

IOW, is it justifying itself?