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Tuesday, May 7th, 2019
| Time |
Event |
| 12:30a |
[$] Proactively reclaiming idle memory
Shakeel Butt started his 2019 Linux Storage, Filesystem, and
Memory-Management Summit session by noting that memory makes up a big part
of the total cost of equipping a data center. As a result, data-center
operators try to make the best use of memory they can, generally
overcommitting it significantly. In this session, Butt described a scheme
in use at Google to try to improve memory utilization; while the need for
the described functionality was generally agreed upon, the developers in
the room were not entirely happy with the solution presented. | | 12:31a |
[$] Cleaning up after dying control groups
Control groups are a useful mechanism for managing resource usage in the
system, but what happens when the control groups themselves become a
resource problem? In a plenary session at the 2019 Linux Storage,
Filesystem, and Memory-Management Summit, Roman Gushchin described problems
he has been facing with deleted control groups that take their time before
actually going away. Some of these problems have been fixed, but the issue
has not been truly resolved. | | 3:23p |
Security updates for Tuesday
Security updates have been issued by Debian (389-ds-base, firefox-esr, and symfony), Fedora (poppler), SUSE (audit, ovmf, and webkit2gtk3), and Ubuntu (aria2, FFmpeg, gnome-shell, and sudo). | | 5:35p |
[$] Remote memory control-group charging
Memory control groups exist to track and limit the amount of memory used by
sets of processes. Normally, one would not expect that memory used by one
group would be charged to another but, as Shakeel Butt described in a
memory-management track session at the 2019 Linux Storage, Filesystem, and
Memory-Management Summit, that does happen in a number of different
situations. It's often a problem, but occasionally it's also a useful
feature. | | 6:00p |
Red Hat Enterprise Linux 8 released Red Hat has announced the
release of Red Hat Enterprise Linux 8. " Modern IT is hybrid
IT. But turning a sprawling ecosystem—from traditional datacenters to
public cloud services—into a true hybrid environment requires a few
things. Scaling as needed. Moving workloads seamlessly. Developing and
managing applications that run anywhere. There's an operating system that
makes those things possible. And now it gives you predictive analytics and
remediation." See the release
notes for more information. | | 8:14p |
[$] get_user_pages(), pinned pages, and DAX
The problems associated with the kernel's internal get_user_pages()
function have been a topic of discussion at the Linux Storage, Filesystem,
and Memory-Management Summit for a few years. At the 2019 event,
Jan Kara began a plenary session by saying that it would be "like last
year's session". It turned out rather differently, though, perhaps due to
the plenary setting; this discussion (along with the related session that
followed) turned out to be one of the most heated at the entire conference. | | 8:15p |
[$] The memory-management subsystem development process
One fixture of the memory-management track at the Linux Storage,
Filesystem, and Memory-Management Summit is a discussion with subsystem
maintainer Andrew Morton
on how the development process is going. The 2019 version indicated that
the memory-management developers are mostly happy with how the process is
working, but there are still things that they would like to see changed. While
some of the issues are old and intractable, others may be amenable to
short-term improvement. |
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