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Date: Tue, 18 Jul 2006 06:59:22 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
To: "Martin J. Bligh" <mbligh@mbligh.org>
cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, linux-mm <linux-mm@kvack.org>,
       Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: inactive-clean list
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On Tue, 18 Jul 2006, Martin J. Bligh wrote:

> Someone remind me why we can't remove the memlocked pages from the LRU
> again? Apart from needing a refcount of how many times they're memlocked
> (or we just shove them back whenever they're unlocked, and let it fall
> out again when we walk the list, but that doesn't fix the accounting
> problem).

We simply do not unmap memlocked pages (see try_to_unmap). And therefore
they are not reclaimable.