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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: schwidefsky@de.ibm.com, akpm@linux-foundation.org,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [patch 2/3] CONFIG_HIGHPTE vs. sub-page page tables.
Date: Wed, 2 Jan 2008 22:24:38 +0100 (CET)	[thread overview]
Message-ID: <Pine.LNX.4.64.0801022223280.27528@anakin> (raw)
In-Reply-To: <20080102204435.GB15460@infradead.org>

On Wed, 2 Jan 2008, Christoph Hellwig wrote:
> On Mon, Nov 12, 2007 at 03:30:11PM +0100, schwidefsky@de.ibm.com wrote:
> > From: Martin Schwidefsky <schwidefsky@de.ibm.com>
> > Solution: The only solution I found to this dilemma is a new typedef:
> > a pgtable_t. For s390 pgtable_t will be a (pte *) - to be introduced
> > with a later patch. For everybody else it will be a (struct page *).
> > The additional problem with the initialization of the ptl lock and the
> > NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor
> > and a destructor pgtable_page_dtor. The page table allocation and free
> > functions need to call these two whenever a page table page is allocated
> > or freed. pmd_populate will get a pgtable_t instead of a struct page
> > pointer. To get the pgtable_t back from a pmd entry that has been
> > installed with pmd_populate a new function pmd_pgtable is added. It
> > replaces the pmd_page call in free_pte_range and apply_to_pte_range.
> 
> Can we please just nuke CONFIG_HIGHPTE?  There's only been a small
> amount of 32bit machines with so much memory that they'd need it
> and they can happily stay on the currently supported enterprise
> distro releases instead of dragging this cruft around forever.

And all MMU-equipped FR-V machines with more than 256 MiB of RAM,
according to arch/frv/Kconfig?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

  reply	other threads:[~2008-01-02 21:24 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-11-12 14:30 [patch 0/3] page table changes schwidefsky
2007-11-12 14:30 ` [patch 1/3] add mm argument to pte/pmd/pud/pgd_free schwidefsky
2007-11-12 14:30 ` [patch 2/3] CONFIG_HIGHPTE vs. sub-page page tables schwidefsky
2008-01-02 20:44   ` Christoph Hellwig
2008-01-02 21:24     ` Geert Uytterhoeven [this message]
2008-01-02 21:28       ` Benjamin Herrenschmidt
2008-01-03 13:12     ` Andi Kleen
2008-01-03 14:01       ` Boaz Harrosh
2008-02-01 23:15   ` Andrew Morton
2008-02-03  5:37     ` Benjamin Herrenschmidt
2008-02-03  5:53       ` Andrew Morton
2008-02-03  6:46         ` Ingo Molnar
2008-02-04 10:36         ` Martin Schwidefsky
2008-02-04 10:51           ` Andrew Morton
2008-02-04 11:02             ` Russell King
2008-02-04 11:14               ` Andrew Morton
2008-02-05 14:39             ` Martin Schwidefsky
2008-02-05 18:46               ` Andrew Morton
2008-02-06  9:06                 ` Martin Schwidefsky
2008-02-06  9:09                   ` Andrew Morton
2008-02-06  9:15                     ` Ingo Molnar
2008-02-06 15:50                     ` Martin Schwidefsky
2007-11-12 14:30 ` [patch 3/3] arch_rebalance_pgtables call schwidefsky
2007-11-13 12:33   ` Nick Piggin
2007-11-14  9:26     ` Martin Schwidefsky
2007-11-14 10:06       ` Benjamin Herrenschmidt
2007-11-14 11:49         ` Martin Schwidefsky
2007-11-14 22:07           ` Benjamin Herrenschmidt
2007-11-15 17:13             ` Martin Schwidefsky

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