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

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Date:	Fri, 26 Jan 2007 17:30:36 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Christoph Lameter <clameter@....com>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] Track mlock()ed pages

Christoph Lameter wrote:
> Add NR_MLOCK
> 
> Track mlocked pages via a ZVC

I think it is not quite right. You are tracking the number of ptes
that point to mlocked pages, which can be >= the actual number of pages.

Also, page_add_anon_rmap still needs to be balanced with page_remove_rmap.

I can't think of an easy way to do this without per-page state. ie.
another page flag.

> 
> Signed-off-by: Christoph Lameter <clameter@....com>
> 

-- 
SUSE Labs, Novell Inc.
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