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Tuesday May 7, 2019. 10:14 PM
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...
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...
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...
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).
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...
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...
Monday May 6, 2019. 10:24 PM
The performance of the fget() function in the kernel was the topic of a discussion led by Dave Watson at the 2019 Linux Storage, Filesystem, and Memory-Management Summit (LSFMM). fget() is used to take a reference to a file (i.e. bump a reference count), based on its file...
In a combined filesystem and storage session at the 2019 Linux Storage, Filesystem, and Memory-Management Summit (LSFMM), Dennis Zhou wanted to talk about discard, which is the process of sending commands (e.g. TRIM) to block devices to indicate blocks that are no longer in...
While persistent memory is normally valued for its persistence, there is also a subcurrent of interest in using it in settings where persistence is not important. In particular, the fact that this memory is relatively inexpensive makes it appealing to use instead of ordinary ...
Sometimes, the kernel's no-regression rule may not have the desired result. Andrea Arcangeli led a session at the 2019 Linux Storage, Filesystem, and Memory-Management Summit to make the point that the recent reversion of a fix after a performance regression was reported has ...
Security updates have been issued by Debian (jquery, librecad, and phpbb3), Fedora (bubblewrap, java-11-openjdk, libvirt, openssh, and pacemaker), Mageia (virtualbox), openSUSE (chromium, ImageMagick, and java-11-openjdk), and SUSE (openssl-1_1).
There is a new Firefox browser release available; its main claim to fame is that it has a fix for the certificate issue that disabled all extensions.
Linus has released the 5.1 kernel, right on schedule. Some of the significant changes in the release include BPF spinlocks, more year-2038 preparation, the TEO CPU-idle governor, The io_uring fast asynchronous I/O mechanism, initial support for pidfds (file descriptors that...
Sunday May 5, 2019. 05:50 PM
The 5.0.13 and 4.19.40 stable kernel updates have been released; they were originally due on May 6, but went out ahead of schedule.
Saturday May 4, 2019. 05:32 PM
Compound pages are created by the kernel as a way of combining a number of small pages into a single, larger unit. Such pages are implemented as a single 'head page' at the beginning, followed by a number of 'tail pages'. Matthew Wilcox has concluded that it would be...
Among the many other things crammed into the page structure that is used to represent a page of memory in the kernel is a set of flags to track the state of the page. These flags have been in short supply for some time; LWN looked at the problem nearly ten years ago....
The 5.0.12, 4.19.39, 4.14.116, and 4.9.173 stable kernel updates have been released; each contains another set of important fixes.
The expiration of the extension signing certificate has evidently caused all extensions to be disabled, leading to a fair amount of discomfort on the net. There is evidently a fix being rolled out, but it requires that the 'Studies' mechanism be enabled in the privacy...
Friday May 3, 2019. 08:14 PM
The Alliance for Open Media developed the AV1 patent-free video codec and sponsors the development of dav1d, a reference optimized decoder for AV1. The 0.3.0 release of dav1d is now available. 'This third release continues to increase the ARM and SSSE3 speed, with more...
Security updates have been issued by Debian (linux-4.9 and otrs2), Fedora (gradle, java-1.8.0-openjdk, jetty, kernel, ruby, and runc), openSUSE (dovecot23, jasper, libsoup, ntfs-3g_ntfsprogs, and webkit2gtk3), SUSE (openssl), and Ubuntu (python-gnupg).
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