From: Miklos Szeredi <miklos@szeredi.hu>
To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-btrfs@vger.kernel.org, lsf-pc@lists.linux-foundation.org
Subject: [LSF/MM TOPIC] sharing pages between mappings
Date: Wed, 11 Jan 2017 11:29:28 +0100 [thread overview]
Message-ID: <CAJfpegv9EhT4Y3QjTZBHoMKSiVGtfmTGPhJp_rh3a7=rFCHu5A@mail.gmail.com> (raw)
I know there's work on this for xfs, but could this be done in generic mm code?
What are the obstacles? page->mapping and page->index are the obvious ones.
If that's too difficult is it maybe enough to share mappings between
files while they are completely identical and clone the mapping when
necessary?
All COW filesystems would benefit, as well as layered ones: lots of
fuse fs, and in some cases overlayfs too.
Related: what can DAX do in the presence of cloned block?
Thanks,
Miklos
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next reply other threads:[~2017-01-11 10:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-11 10:29 Miklos Szeredi [this message]
2017-01-11 11:51 ` [Lsf-pc] [LSF/MM TOPIC] sharing pages between mappings Jan Kara
2017-01-11 14:13 ` Miklos Szeredi
2017-01-17 15:46 ` Jan Kara
2017-01-11 18:05 ` Darrick J. Wong
2017-01-11 20:35 ` Andreas Dilger
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