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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
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Subject: Re: [PATCH 01/23] radix-tree: implement preload for multiple
 contiguous elements
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Date: Thu,  8 Aug 2013 11:45:05 +0300 (EEST)
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To: Jan Kara <jack@suse.cz>, Matthew Wilcox <willy@linux.intel.com>, Dave Hansen <dave@sr71.net>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Andrea Arcangeli <aarcange@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Al Viro <viro@zeniv.linux.org.uk>, Hugh Dickins <hughd@google.com>, Wu Fengguang <fengguang.wu@intel.com>, Mel Gorman <mgorman@suse.de>, linux-mm@kvack.org, Andi Kleen <ak@linux.intel.com>, "Kirill A. Shutemov" <kirill@shutemov.name>, Hillf Danton <dhillf@gmail.com>, Ning Qu <quning@google.com>, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org

Kirill A. Shutemov wrote:
> In this case it should use 39 nodes, but it uses only 38. I can't understand why. :(

Okay, I've got it. We share one 2nd level node.

Patch is below. Please review.