linux-kernel - Re: [PATCH] radix-tree: replace preallocated node array with linked list

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Message-Id: <20150513142339.5f399c1feb795a83d392160d@linux-foundation.org>
Date:	Wed, 13 May 2015 14:23:39 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Johannes Weiner <hannes@...xchg.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] radix-tree: replace preallocated node array with linked
 list

On Wed, 13 May 2015 18:36:54 +0300 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> wrote:

> Currently we use per-cpu array to hold pointers to preallocated nodes.
> Let's replace it with linked list. On x86_64 it saves 256 bytes in
> per-cpu ELF section which may translate into freeing up 2MB of memory
> for NR_CPUS==8192.
> 

huh, so it's a non-NULL-terminated singly linked list.  Scary, but
it seems the right way to do it!
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