From: Nick Piggin <nickpiggin@yahoo.com.au>
To: npiggin@suse.de
Cc: Badari Pulavarty <pbadari@gmail.com>,
Dave Kleikamp <shaggy@linux.vnet.ibm.com>,
anton@au1.ibm.com,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Carsten Otte <cotte@de.ibm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Hugh Dickins <hugh@veritas.com>,
Jared Hulbert <jaredeh@gmail.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
linux-mm@kvack.org
Subject: Re: [patch 2/8] mm: introduce VM_MIXEDMAP
Date: Mon, 18 Feb 2008 13:59:04 +1100 [thread overview]
Message-ID: <200802181359.05429.nickpiggin@yahoo.com.au> (raw)
In-Reply-To: <20080214062531.335727000@suse.de>
On Thursday 14 February 2008 17:16, npiggin@suse.de wrote:
> Introduce a new type of mapping, VM_MIXEDMAP. This is unlike VM_PFNMAP in
> that it can support COW mappings of arbitrary ranges including ranges
> without struct page (PFNMAP can only support COW in those cases where the
> un-COW-ed translations are mapped linearly in the virtual address).
>
> VM_MIXEDMAP achieves this by refcounting all pfn_valid pages, and not
> refcounting !pfn_valid pages (which is not an option for VM_PFNMAP, because
> it needs to avoid refcounting pfn_valid pages eg. for /dev/mem mappings).
BTW. sorry quilt mail outsmarted me here... I had just intended to send
these privately to Badari, Dave, and the other powerpc guys. I wasn't
intending this for you Linus, or linux-mm etc.
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next prev parent reply other threads:[~2008-02-18 2:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20080214061657.700804000@suse.de>
2008-02-14 6:16 ` npiggin, Jared Hulbert
2008-02-18 2:59 ` Nick Piggin [this message]
2008-02-22 18:48 ` Jared Hulbert
2008-02-14 6:17 ` [patch 3/8] mm: introduce pte_special pte bit npiggin
2008-02-14 18:55 ` Badari Pulavarty
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