From: Jes Sorensen <jes@sgi.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@osdl.org>,
torvalds@osdl.org, linux-kernel@vger.kernel.org,
linux-ia64@vger.kernel.org, hch@lst.de, cotte@de.ibm.com,
Hugh Dickins <hugh@veritas.com>
Subject: Re: [patch 2/2] mspec driver
Date: Fri, 17 Mar 2006 14:11:48 +0000 [thread overview]
Message-ID: <441AC3A4.801@sgi.com> (raw)
In-Reply-To: <441AC300.8020003@yahoo.com.au>
Nick Piggin wrote:
> Jes Sorensen wrote:
>> We don't want COW here as the access is backed by special behavior in
>> the memory controller. We only allow shared mappings for that reason.
>>
> No problem, I think you should just stop using the VM_PFNMAP flag then.
> [Linus should jump in here if I'm wrong ;)]
I'd have to go back and find the discussion to verify, but if I
remember correctly the conclusion was that I needed to use it in
order to make sure that vm_normal_page() didn't start thinking it was
in fact a real page, ie. VM_PFNMAP + never a COW mapping..
Chers,
Jes
WARNING: multiple messages have this Message-ID (diff)
From: Jes Sorensen <jes@sgi.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@osdl.org>,
torvalds@osdl.org, linux-kernel@vger.kernel.org,
linux-ia64@vger.kernel.org, hch@lst.de, cotte@de.ibm.com,
Hugh Dickins <hugh@veritas.com>
Subject: Re: [patch 2/2] mspec driver
Date: Fri, 17 Mar 2006 15:11:48 +0100 [thread overview]
Message-ID: <441AC3A4.801@sgi.com> (raw)
In-Reply-To: <441AC300.8020003@yahoo.com.au>
Nick Piggin wrote:
> Jes Sorensen wrote:
>> We don't want COW here as the access is backed by special behavior in
>> the memory controller. We only allow shared mappings for that reason.
>>
> No problem, I think you should just stop using the VM_PFNMAP flag then.
> [Linus should jump in here if I'm wrong ;)]
I'd have to go back and find the discussion to verify, but if I
remember correctly the conclusion was that I needed to use it in
order to make sure that vm_normal_page() didn't start thinking it was
in fact a real page, ie. VM_PFNMAP + never a COW mapping..
Chers,
Jes
next prev parent reply other threads:[~2006-03-17 14:11 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-16 16:55 [patch] mspec - special memory driver and do_no_pfn handler Jes Sorensen
2006-03-16 16:55 ` Jes Sorensen
2006-03-17 0:37 ` Andrew Morton
2006-03-17 0:37 ` Andrew Morton
2006-03-17 1:04 ` Linus Torvalds
2006-03-17 1:04 ` Linus Torvalds
2006-03-17 2:13 ` Robin Holt
2006-03-17 2:13 ` Robin Holt
2006-03-17 4:58 ` Benjamin Herrenschmidt
2006-03-17 4:58 ` Benjamin Herrenschmidt
2006-03-17 9:15 ` Jes Sorensen
2006-03-17 9:15 ` Jes Sorensen
2006-03-17 13:29 ` Carsten Otte
2006-03-17 13:29 ` Carsten Otte
2006-03-17 18:03 ` Christoph Hellwig
2006-03-17 18:03 ` Christoph Hellwig
2006-03-17 9:42 ` Jes Sorensen
2006-03-17 9:42 ` Jes Sorensen
2006-03-17 12:29 ` Carsten Otte
2006-03-17 12:29 ` Carsten Otte
2006-03-17 12:28 ` [patch 1/2] do_no_pfn handler (was: Re: [patch] mspec - special memory driver and do_no_pfn handler) Jes Sorensen
2006-03-17 12:28 ` Jes Sorensen
2006-03-17 12:38 ` [patch 2/2] mspec driver " Jes Sorensen
2006-03-17 12:38 ` Jes Sorensen
2006-03-17 13:36 ` [patch 2/2] mspec driver Nick Piggin
2006-03-17 13:36 ` Nick Piggin
2006-03-17 14:04 ` Jes Sorensen
2006-03-17 14:04 ` Jes Sorensen
2006-03-17 14:09 ` Nick Piggin
2006-03-17 14:09 ` Nick Piggin
2006-03-17 14:11 ` Jes Sorensen [this message]
2006-03-17 14:11 ` Jes Sorensen
2006-03-17 14:16 ` Nick Piggin
2006-03-17 14:16 ` Nick Piggin
2006-03-17 13:51 ` [patch] mspec - special memory driver and do_no_pfn handler Carsten Otte
2006-03-17 13:51 ` Carsten Otte
2006-03-17 13:53 ` Carsten Otte
2006-03-17 13:53 ` Carsten Otte
2006-03-17 13:56 ` Nick Piggin
2006-03-17 13:56 ` Nick Piggin
2006-03-17 13:58 ` Jes Sorensen
2006-03-17 13:58 ` Jes Sorensen
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