linux-kernel - Re: [RFC] Track mlock()ed pages

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Message-ID: <Pine.LNX.4.64.0701260742340.6141@schroedinger.engr.sgi.com>
Date:	Fri, 26 Jan 2007 07:44:42 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...l.org>
cc:	Nick Piggin <nickpiggin@...oo.com.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Track mlock()ed pages

On Fri, 26 Jan 2007, Andrew Morton wrote:

> > > > Track mlocked pages via a ZVC
> 
> Why?

Large amounts of mlocked pages may be a problem for 

1. Reclaim behavior.

2. Defragmentation

> You could perhaps go for a walk across all the other vmas which presently
> map this page.  If any of them have VM_LOCKED, don't increment the counter.
> Similar on removal: only decrement the counter when the final mlocked VMA
> is dropping the pte.

For that we would need an additional refcount for vmlocked maps in the 
page struct. Looks too expensive.
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