linux-kernel - Re: [PATCH] mm: inactive-clean list

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Message-ID: <Pine.LNX.4.64.0607180657160.30887@schroedinger.engr.sgi.com>
Date:	Tue, 18 Jul 2006 06:59:22 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	"Martin J. Bligh" <mbligh@...igh.org>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-mm <linux-mm@...ck.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: inactive-clean list

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.

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