From: Christoph Hellwig <hch@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@zip.com.au>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch] generic nonlinear mappings, 2.5.44-mm2-D0
Date: Tue, 22 Oct 2002 18:49:39 +0100 [thread overview]
Message-ID: <20021022184938.A2395@infradead.org> (raw)
In-Reply-To: <Pine.LNX.4.44.0210221936010.18790-100000@localhost.localdomain>; from mingo@elte.hu on Tue, Oct 22, 2002 at 07:57:00PM +0200
On Tue, Oct 22, 2002 at 07:57:00PM +0200, Ingo Molnar wrote:
> the attached patch (ontop of 2.5.44-mm2) implements generic (swappable!)
> nonlinear mappings and sys_remap_file_pages() support. Ie. no more
> MAP_LOCKED restrictions and strange pagefault semantics.
>
> to implement this i added a new pte concept: "file pte's". This means that
> upon swapout, shared-named mappings do not get cleared but get converted
> into file pte's, which can then be decoded by the pagefault path and can
> be looked up in the pagecache.
>
> the normal linear pagefault path from now on does not assume linearity and
> decodes the offset in the pte. This also tests pte encoding/decoding in
> the pagecache case, and the ->populate functions.
Ingo,
what is the reason for that interface? It looks like a gross performance
hack for misdesigned applications to me, kindof windowsish..
Is this for whoracle or something like that?
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next prev parent reply other threads:[~2002-10-22 17:49 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-22 17:57 Ingo Molnar
2002-10-22 17:49 ` Christoph Hellwig [this message]
2002-10-22 19:23 ` Andrew Morton
2002-10-22 20:27 ` Ingo Molnar
2002-10-22 20:38 ` Alan Cox
2002-10-22 20:42 ` Ingo Molnar
2002-10-22 21:18 ` Alan Cox
2002-10-23 19:09 ` Bryan O'Sullivan
2002-10-22 20:49 ` Ingo Molnar
2002-10-22 20:19 ` Ingo Molnar
2002-10-23 2:05 ` Andrea Arcangeli
2002-10-23 7:19 ` Ingo Molnar
2002-10-23 11:50 ` Andrea Arcangeli
2002-10-23 14:20 ` Ingo Molnar
2002-10-23 14:23 ` Andrea Arcangeli
2002-10-22 19:13 ` Rik van Riel
2002-10-22 22:27 ` David S. Miller
2002-10-22 22:56 ` Ingo Molnar
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