From: William Lee Irwin III <wli@holomorphy.com>
To: Rik van Riel <riel@conectiva.com.br>
Cc: Andrew Morton <akpm@zip.com.au>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: page_add/remove_rmap costs
Date: Wed, 24 Jul 2002 19:45:35 -0700 [thread overview]
Message-ID: <20020725024535.GB2907@holomorphy.com> (raw)
In-Reply-To: <Pine.LNX.4.44L.0207241319550.3086-100000@imladris.surriel.com>
On Tue, 23 Jul 2002, Andrew Morton wrote:
>> Then again, if the per-vma pfn->pte lookup is feasible, we may not need
>> the pte_chain at all...
On Wed, Jul 24, 2002 at 01:24:13PM -0300, Rik van Riel wrote:
> It is feasible, both davem and bcrl made code to this effect. The
> only problem with that code is that it gets ugly quick after mremap.
I actually took an axe to mremap recently, and althought the pieces
never came back together into working code, it's clear that it's far
from optimal. It's doing a virtual sweep over the region and repeating
the pgd -> pmd -> pte traversals for each pte. So invading that territory
may well be justifiable on more grounds than rmap itself.
I may revisit mremap.c at some point in the distant future if that
tweaking alone is considered valuable.
Cheers,
Bill
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next prev parent reply other threads:[~2002-07-25 2:45 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-24 6:33 page_add/remove_rmap costs Andrew Morton
2002-07-24 6:48 ` William Lee Irwin III
2002-07-24 16:24 ` Rik van Riel
2002-07-24 20:15 ` Andrew Morton
2002-07-24 20:21 ` Rik van Riel
2002-07-24 20:28 ` Andrew Morton
2002-07-25 2:35 ` Rik van Riel
2002-07-25 3:08 ` William Lee Irwin III
2002-07-25 3:14 ` Martin J. Bligh
2002-07-25 4:21 ` Andrew Morton
2002-07-25 2:45 ` William Lee Irwin III [this message]
2002-07-25 4:50 ` William Lee Irwin III
2002-07-25 5:14 ` Andrew Morton
2002-07-25 5:15 ` John Levon
2002-07-25 5:30 ` William Lee Irwin III
2002-07-25 5:47 ` Andrew Morton
2002-07-25 5:42 ` William Lee Irwin III
2002-07-25 5:59 ` Andrew Morton
2002-07-25 7:09 ` Andrew Morton
2002-07-26 7:33 ` Daniel Phillips
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