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From: Goldwyn Rodrigues <rgoldwyn@suse.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>,
	Jerome Glisse <jglisse@redhat.com>,
	Michal Hocko <mhocko@kernel.org>,
	lsf-pc@lists.linux-foundation.org,
	linux-xfs <linux-xfs@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	linux-ext4 <linux-ext4@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-nvdimm <linux-nvdimm@lists.01.org>
Subject: Re: [Lsf-pc] [LSF/MM TOPIC] The end of the DAX experiment
Date: Wed, 5 Jun 2019 11:22:04 -0500
Message-ID: <20190605162204.jzou5hry5exly5wx@fiona> (raw)
In-Reply-To: <CAPcyv4hsDqvrV5yiDq8oWPuWb3WpuCEk_HB4qBxfiDpUwo75QQ@mail.gmail.com>

Hi Dan/Jerome,

On 12:20 14/02, Dan Williams wrote:
> On Thu, Feb 14, 2019 at 12:09 PM Matthew Wilcox <willy@infradead.org> wrote:
> >
> > On Thu, Feb 14, 2019 at 11:31:24AM -0800, Dan Williams wrote:
> > > On Thu, Feb 14, 2019 at 11:10 AM Jerome Glisse <jglisse@redhat.com> wrote:
> > > > I am just again working on my struct page mapping patchset as well as
> > > > the generic page write protection that sits on top. I hope to be able
> > > > to post the v2 in couple weeks. You can always look at my posting last
> > > > year to see more details.
> > >
> > > Yes, I have that in mind as one of the contenders. However, it's not
> > > clear to me that its a suitable fit for filesystem-reflink. Others
> > > have floated the 'page proxy' idea, so it would be good to discuss the
> > > merits of the general approaches.
> >
> > ... and my preferred option of putting pfn entries in the page cache.
> 
> Another option to include the discussion.
> 
> > Or is that what you meant by "page proxy"?
> 
> Page proxy would be an object that a filesystem could allocate to
> point back to a single physical 'struct page *'. The proxy would
> contain an override for page->index.

Was there any outcome on this and its implementation? I am specifically
interested in this for DAX support on btrfs/CoW: The TODO comment on
top of dax_associate_entry() :)

If there are patches/git tree I could use to base my patches on, it would
be nice.

-- 
Goldwyn

  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-06 21:12 Dan Williams
2019-02-07 21:51 ` Kani, Toshi
2019-02-08  9:02   ` Johannes Thumshirn
2019-02-14 13:46 ` [Lsf-pc] " Michal Hocko
2019-02-14 18:25   ` Dan Williams
2019-02-14 19:10     ` Jerome Glisse
2019-02-14 19:31       ` Dan Williams
2019-02-14 20:08         ` Matthew Wilcox
2019-02-14 20:20           ` Dan Williams
2019-02-14 20:34             ` Jerome Glisse
2019-02-16  5:37             ` Dave Chinner
2019-06-05 16:22             ` Goldwyn Rodrigues [this message]
2019-06-07  6:00               ` Dan Williams
2019-02-17 20:29 ` Ric Wheeler
2019-02-18 18:17   ` Dan Williams

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