From: Christoph Lameter <clameter@sgi.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC] Track mlock()ed pages
Date: Fri, 26 Jan 2007 07:44:42 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0701260742340.6141@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20070126031300.59f75b06.akpm@osdl.org>
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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next prev parent reply other threads:[~2007-01-26 15:44 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-26 5:43 [RFC] Track mlock()ed pages Christoph Lameter
2007-01-26 6:30 ` Nick Piggin
2007-01-26 6:36 ` Christoph Lameter
2007-01-26 11:13 ` Andrew Morton
2007-01-26 12:00 ` Nick Piggin
2007-01-26 15:44 ` Christoph Lameter [this message]
2007-01-26 18:10 ` Andrew Morton
2007-01-26 18:21 ` KAMEZAWA Hiroyuki
2007-01-26 18:23 ` Christoph Lameter
2007-01-26 18:42 ` Andrew Morton
2007-01-27 22:19 ` Rik van Riel
2007-01-27 22:30 ` Andrew Morton
2007-01-27 22:36 ` Rik van Riel
2007-01-26 11:46 ` Nick Piggin
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