From: Russell King <rmk@arm.linux.org.uk>
To: Nick Piggin <npiggin@suse.de>
Cc: Martin Schwidefsky <martin.schwidefsky@de.ibm.com>,
carsteno@linux.vnet.ibm.com,
Heiko Carstens <h.carstens@de.ibm.com>,
Jared Hulbert <jaredeh@gmail.com>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-arch@vger.kernel.org
Subject: Re: [rfc][patch] mm: use a pte bit to flag normal pages
Date: Mon, 7 Jan 2008 10:30:29 +0000 [thread overview]
Message-ID: <20080107103028.GA9325@flint.arm.linux.org.uk> (raw)
In-Reply-To: <20080107044355.GA11222@wotan.suse.de>
On Mon, Jan 07, 2008 at 05:43:55AM +0100, Nick Piggin wrote:
> We initially wanted to do the whole vm_normal_page thing this way, with
> another pte bit, but we thought there were one or two archs with no spare
> bits. BTW. I also need this bit in order to implement my lockless
> get_user_pages, so I do hope to get it in. I'd like to know what
> architectures cannot spare a software bit in their pte_present ptes...
ARM is going to have to use the three remaining bits we have in the PTE
to store the memory type to resolve bugs on later platforms. Once they're
used, ARM will no longer have any room for any further PTE expansion.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:
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next prev parent reply other threads:[~2008-01-07 10:30 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-14 13:38 [rfc][patch 1/2] mm: introduce VM_MIXEDMAP mappings Nick Piggin
2007-12-14 13:41 ` [rfc][patch 2/2] xip: support non-struct page memory Nick Piggin
2007-12-14 13:46 ` Carsten Otte
2007-12-15 1:07 ` Jared Hulbert
2007-12-15 1:17 ` Nick Piggin
2007-12-15 6:47 ` Jared Hulbert
2007-12-19 14:04 ` Carsten Otte
2007-12-20 9:23 ` Jared Hulbert
2007-12-21 0:40 ` Nick Piggin
2007-12-20 13:53 ` Carsten Otte
2007-12-20 14:33 ` Carsten Otte
2007-12-20 14:50 ` Carsten Otte
2007-12-20 17:24 ` Jared Hulbert
2007-12-21 0:12 ` Jared Hulbert
2007-12-21 0:56 ` Nick Piggin
2007-12-21 9:56 ` Carsten Otte
2007-12-21 9:49 ` Carsten Otte
2007-12-21 0:50 ` Nick Piggin
2007-12-21 10:02 ` Carsten Otte
2007-12-21 10:14 ` Nick Piggin
2007-12-21 10:17 ` Carsten Otte
2007-12-21 10:23 ` Nick Piggin
2007-12-21 10:31 ` Carsten Otte
2007-12-21 0:45 ` Nick Piggin
2007-12-21 10:05 ` Carsten Otte
2007-12-21 10:20 ` Nick Piggin
2007-12-21 10:35 ` Carsten Otte
2007-12-21 10:47 ` Nick Piggin
2007-12-21 19:29 ` Martin Schwidefsky
2008-01-07 4:43 ` [rfc][patch] mm: use a pte bit to flag normal pages Nick Piggin
2008-01-07 10:30 ` Russell King [this message]
2008-01-07 11:14 ` Nick Piggin
2008-01-07 18:49 ` Jared Hulbert
2008-01-07 19:45 ` Russell King
2008-01-07 22:52 ` Jared Hulbert
2008-01-08 2:37 ` Andi Kleen
2008-01-08 2:49 ` Nick Piggin
2008-01-08 3:31 ` Andi Kleen
2008-01-08 3:52 ` Nick Piggin
2008-01-08 10:11 ` Catalin Marinas
2008-01-08 10:52 ` Russell King
2008-01-08 13:54 ` Catalin Marinas
2008-01-08 14:08 ` Russell King
2008-01-10 13:33 ` Carsten Otte
2008-01-10 23:18 ` Nick Piggin
2008-01-08 9:35 ` [rfc][patch 0/4] VM_MIXEDMAP patchset with s390 backend Carsten Otte
2008-01-08 10:08 ` Nick Piggin
2008-01-08 11:34 ` Carsten Otte
2008-01-08 11:55 ` Nick Piggin
2008-01-08 12:03 ` Carsten Otte
2008-01-08 13:56 ` Jörn Engel
2008-01-08 14:51 ` Carsten Otte
2008-01-08 18:09 ` Jared Hulbert
2008-01-08 22:12 ` Nick Piggin
2008-01-09 15:14 ` [rfc][patch 0/4] VM_MIXEDMAP patchset with s390 backend v2 Carsten Otte
[not found] ` <1199891032.28689.9.camel@cotte.boeblingen.de.ibm.com>
2008-01-09 15:14 ` [rfc][patch 1/4] include: add callbacks to toggle reference counting for VM_MIXEDMAP pages Carsten Otte, Carsten Otte
2008-01-09 17:31 ` Martin Schwidefsky
2008-01-09 18:17 ` Jared Hulbert
2008-01-10 7:59 ` Carsten Otte
2008-01-10 20:01 ` Jared Hulbert
2008-01-11 8:45 ` Carsten Otte
2008-01-13 2:44 ` Nick Piggin
2008-01-14 11:36 ` Carsten Otte
2008-01-16 4:04 ` Nick Piggin
2008-01-15 13:05 ` Carsten Otte
2008-01-16 4:22 ` Nick Piggin
2008-01-16 14:29 ` [rft] updated xip patch rollup Nick Piggin
2008-01-17 10:24 ` Carsten Otte
2008-01-10 20:23 ` [rfc][patch 1/4] include: add callbacks to toggle reference counting for VM_MIXEDMAP pages Jared Hulbert
2008-01-11 8:32 ` Carsten Otte
2008-01-10 0:20 ` Nick Piggin
2008-01-10 8:06 ` Carsten Otte
2008-01-09 15:14 ` [rfc][patch 2/4] mm: introduce VM_MIXEDMAP Carsten Otte, Jared Hulbert, Carsten Otte
2008-01-09 15:14 ` [rfc][patch 3/4] Convert XIP to support non-struct page backed memory Carsten Otte, Nick Piggin
2008-01-09 15:14 ` [rfc][patch 4/4] s390: remove struct page entries for DCSS memory segments Carsten Otte, Carsten Otte
[not found] ` <1199784196.25114.11.camel@cotte.boeblingen.de.ibm.com>
2008-01-08 9:35 ` [rfc][patch 1/4] mm: introduce VM_MIXEDMAP Carsten Otte, Jared Hulbert, Carsten Otte
2008-01-08 9:35 ` [rfc][patch 2/4] xip: support non-struct page memory Carsten Otte, Nick Piggin, Carsten Otte
2008-01-08 9:36 ` [rfc][patch 3/4] s390: remove sturct page entries for z/VM DCSS memory segments Carsten Otte
2008-01-08 9:36 ` [rfc][patch 4/4] s390: mixedmap_refcount_pfn implementation using list walk Carsten Otte
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