Benefits for LWN subscribers
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The Linux Storage, Filesystem, and Memory-Management Summit is an annual,
invitation-only gathering of core-kernel developers; it is one of the most
intensive and technical events on the annual calendar. The
LSFMM Summit was held April 30 to May 2 in San Juan, Puerto
Rico; it was supplemented this year by a special track dedicated to the BPF
virtual machine. Once again, LWN was there and able to cover a portion of
Our coverage is a work in progress; the articles that are available at this
There were a few sessions of general interest attended by all developers at
The filesystem developers discussed the following topics in their track:
Improving fget() performance:
fget() and fput() are using more CPU time than expected
for certain workloads; is there anything that can be done to fix that?
Taking ZUFS upstream: a discussion
about how the “zero-copy user-mode filesystem” (ZUFS) could get merged into
DAX semantics: a discussion on what the
semantics of a per-inode flag to indicate files that should be accessed via
DAX should be.
NFS topics: a discussion of ongoing
work on NFS in the kernel.
A filesystem for virtualization: a
discussion about the virtio-fs filesystem for KVM guests to share filesystems
from the host, and some features that still need to be worked out.
Common needs for Samba and NFS: a
discussion about some needs for network filesystems that might best
be addressed by kernel changes.
Filesystem and storage sessions
Some sessions were shared discussions involving both storage and
Issues around discard: Dennis Zhou
brings up some problems using discard—telling the block device that some blocks
are no longer being used—and looks for ways to handle them better.
The memory-management developers sequestered themselves to dive into a
number of detailed topics:
Thanks to the LSFMM 2019 program committee for inviting LWN to the event,
and to the Linux Foundation, LWN’s travel sponsor, for supporting our
travel to Puerto Rico.
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