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 14:04:10 +0000 [thread overview]
Message-ID: <yq07j6tuq05.fsf@jaguar.mkp.net> (raw)
In-Reply-To: <441ABB68.1020502@yahoo.com.au>
>>>>> "Nick" = Nick Piggin <nickpiggin@yahoo.com.au> writes:
Nick> Jes Sorensen wrote:
>> + vma->vm_flags |= (VM_IO | VM_LOCKED | VM_RESERVED | VM_PFNMAP);
Nick> VM_PFNMAP actually has a fairly specific meaning [unlike the
Nick> rest of them :)] so you should be careful with it. Actually if
Nick> you set vm_pgoff in the right way, then that should enable you
Nick> to do COWs on these areas if that is what you want.
Yup, I went through that when I started using it. I think you guided
me through it :-)
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.
Cheers,
Jes
next prev parent reply other threads:[~2006-03-17 14:04 UTC|newest]
Thread overview: 21+ 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
2006-03-17 0:37 ` Andrew Morton
2006-03-17 1:04 ` Linus Torvalds
2006-03-17 2:13 ` Robin Holt
2006-03-17 4:58 ` Benjamin Herrenschmidt
2006-03-17 9:15 ` Jes Sorensen
2006-03-17 13:29 ` Carsten Otte
2006-03-17 18:03 ` Christoph Hellwig
2006-03-17 9:42 ` Jes Sorensen
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 12:38 ` [patch 2/2] mspec driver " Jes Sorensen
2006-03-17 13:36 ` [patch 2/2] mspec driver Nick Piggin
2006-03-17 14:04 ` Jes Sorensen [this message]
2006-03-17 14:09 ` Nick Piggin
2006-03-17 14:11 ` Jes Sorensen
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 13:53 ` Carsten Otte
2006-03-17 13:56 ` Nick Piggin
2006-03-17 13:58 ` Jes Sorensen
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