From: Andiry Xu <andiry@gmail.com>
To: lsf-pc@lists.linux-foundation.org
Cc: Linux FS Devel <linux-fsdevel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
dan.j.williams@intel.com, david@fromorbit.com,
willy@infradead.org, swanson@cs.ucsd.edu, jix024@cs.ucsd.edu
Subject: [LSF/MM TOPIC] Native NVMM file systems
Date: Wed, 31 Jan 2018 16:45:36 -0800 [thread overview]
Message-ID: <CAOvWMLZVkQ1D=Jn-_O9owewr7U699bN=dmwuBoDnQVLEkkXJ8A@mail.gmail.com> (raw)
PMEM/DAX should allow for significant improvements in file system
performance and enable new programming models that allow direct,
efficient access to PMEM from userspace. Achieving these gains in
existing file systems built for block devices (e.g., XFS and EXT4…)
presents a range of challenges (e.g.,
https://lkml.org/lkml/2016/9/11/159) and has been the subject of a lot
of recent work on ext4 and xfs.
An alternative is to build a NVMM-aware file system from scratch that
takes full advantage of the performance that PMEM offers and avoids
the complexity that block-based file systems include to maximize
performance on slow storage (e.g., relaxing atomicity constraints on
many operations). Of course, it also brings with it the complexity of
another file system.
We recently sent out a patch set for one-such “clean slate” NVMM-aware
file system called NOVA. NOVA is log-structured DAX file system with
several nice features:
* High performance, especially in metadata operations due to efficient
fine-grained logging
* High scalability with per-CPU memory pool and per-inode logging
* Strong metadata and data atomicity guarantees for all operations
* Full filesystem snapshot support with DAX-mmap
* Metadata replication/checksums and RAID-4 style data protection
At the summit, we would like to discuss the trade-offs between
adapting NVMM features to existing file systems vs. creating/adopting
a purpose-built file system for NVMM. NOVA serves as useful starting
point for that discussion by demonstrating what’s possible. It may
also suggest some features that could be adapted to other file systems
to improve NVMM performance.
We welcome people that are interested in file systems and NVM/DAX.
Particular people that would be useful to have in attendance are Dan
Williams, Dave Chinner, and Matthew Wilcox.
Thanks,
Andiry
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next reply other threads:[~2018-02-01 0:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-01 0:45 Andiry Xu [this message]
2018-02-01 1:03 ` Dan Williams
2018-02-01 1:13 ` Dan Williams
2018-02-07 10:41 ` Jan Kara
2018-02-01 1:47 ` Darrick J. Wong
2018-02-01 2:12 ` Andiry Xu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAOvWMLZVkQ1D=Jn-_O9owewr7U699bN=dmwuBoDnQVLEkkXJ8A@mail.gmail.com' \
--to=andiry@gmail.com \
--cc=dan.j.williams@intel.com \
--cc=david@fromorbit.com \
--cc=jix024@cs.ucsd.edu \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-nvdimm@ml01.01.org \
--cc=lsf-pc@lists.linux-foundation.org \
--cc=swanson@cs.ucsd.edu \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox