Language Selection

English French German Italian Portuguese Spanish


Syndicate content is a comprehensive source of news and opinions from and about the Linux community. This is the main feed, listing all articles which are posted to the site front page.
Updated: 2 hours 30 min ago

[$] Implementing alignment guarantees for kmalloc()

Friday 18th of October 2019 09:52:44 PM
kmalloc() is a frequently used primitive for the allocation of small objects in the kernel. During the 2019 Linux Storage, Filesystem, and Memory Management Summit, Vlastimil Babka led a session about the unexpected alignment problems developers face when using this function. After a few months he has come back with the second version of a patch set implementing a natural alignment guarantee for kmalloc(). From the strong opposition it faced initially, it seemed that the change would not get accepted. However, it ended up in Linus Torvalds's tree. Let's explore what happened.

LTTng 2.11.0 "Lafontaine" released

Friday 18th of October 2019 02:53:21 PM
After more than two years of development, the Linux trace toolkit next generation (LTTng) project has released version 2.11.0 of the kernel and user-space tracing tool. The release covers the LTTng tools, LTTng user-space tracer, and LTTng kernel modules. It includes a number of new features that are described in the announcement including session rotation, dynamic user-space tracing, call-stack capturing for the kernel and user space, improved networking performance, NUMA awareness for user-space tracing buffer allocation, and more. "The biggest feature of this release is the long-awaited session rotation support. Session rotations now allow you to rotate an ongoing tracing session much in the same way as you would rotate logs. The 'lttng rotate' command rotates the current trace chunk of the current tracing session. Once a rotation is completed, LTTng does not manage the trace chunk archive anymore: you can read it, modify it, move it, or remove it. Because a rotation causes the tracing session’s current sub-buffers to be flushed, trace chunk archives are never redundant, that is, they do not overlap over time, unlike snapshots. Once a rotation is complete, offline analyses can be performed on the resulting trace, much like in 'normal' mode. However, the big advantage is that this can be done without interrupting tracing, and without being limited to tools which implement the 'live' protocol."

Five new stable kernels

Friday 18th of October 2019 02:15:14 PM
Greg Kroah-Hartman has announced the release of the 5.3.7, 4.19.80, 4.14.150, 4.9.197, and 4.4.197 stable kernels. All five contain important fixes throughout the kernel tree, as usual. Users of those series should upgrade.

Security updates for Friday

Friday 18th of October 2019 01:20:10 PM
Security updates have been issued by Debian (poppler, sudo, and wordpress), Oracle (java-1.8.0-openjdk), Red Hat (java-1.8.0-openjdk), Scientific Linux (java-1.8.0-openjdk, java-11-openjdk, and kernel), and SUSE (kernel and postgresql10).

Ubuntu 19.10 (Eoan Ermine) released

Thursday 17th of October 2019 10:09:52 PM
Ubuntu has announced the release of 19.10 "Eoan Ermine" in desktop and server editions as well as all of the different flavors: Ubuntu Budgie, Kubuntu, Lubuntu, Ubuntu Kylin, Ubuntu MATE, Ubuntu Studio, and Xubuntu. "The Ubuntu kernel has been updated to the 5.3 based Linux kernel, and our default toolchain has moved to gcc 9.2 with glibc 2.30. Additionally, the Raspberry Pi images now support the new Pi 4 as well as 2 and 3. Ubuntu Desktop 19.10 introduces GNOME 3.34 the fastest release yet with significant performance improvements delivering a more responsive experience. App organisation is easier with the ability to drag and drop icons into categorised folders and users can select light or dark Yaru theme variants. The Ubuntu Desktop installer also introduces installing to ZFS as a root filesystem as an experimental feature." More information can also be found in the release notes.

[$] Really fixing getrandom()

Thursday 17th of October 2019 05:08:23 PM
The final days of the 5.3 kernel development cycle included an extensive discussion of the getrandom() API and the reversion of an ext4 improvement that was indirectly causing boot hangs due to a lack of entropy. Blocking filesystem improvements because they are too effective is clearly not a good long-term development strategy for the kernel, so there was a consensus that some sort of better solution had to be found. What was lacking was an idea of what that solution should be. It is thus surprising that the problem appears to have been dealt with in 5.4 with little in the way of dissent or disagreement.

Bazel 1.0 released

Thursday 17th of October 2019 02:23:16 PM
Google has announced version 1.0 of its Bazel build system. "A growing list of Bazel users attests to the widespread demand for scalable, reproducible, and multi-lingual builds. Bazel helps Google be more open too: several large Google open source projects, such as Angular and TensorFlow, use Bazel. Users have reported 3x test time reductions and 10x faster build speeds after switching to Bazel."

Security updates for Thursday

Thursday 17th of October 2019 01:27:50 PM
Security updates have been issued by Arch Linux (sudo), Debian (libsdl1.2 and libsdl2), Mageia (e2fsprogs, kernel, libpcap and tcpdump, nmap, and sudo), openSUSE (GraphicsMagick and sudo), Oracle (java-1.8.0-openjdk, java-11-openjdk, jss, and kernel), Red Hat (java-1.8.0-openjdk and java-11-openjdk), Scientific Linux (jss), SUSE (gcc7 and libreoffice), and Ubuntu (leading to a double-free, libsdl1.2, and tiff).

[$] Weekly Edition for October 17, 2019

Thursday 17th of October 2019 12:25:53 AM
The Weekly Edition for October 17, 2019 is available.

[$] WireGuard and the crypto API

Wednesday 16th of October 2019 09:38:05 PM
When last we looked in on the progress of the WireGuard VPN tunnel toward the mainline kernel, it seemed like the main sticking point had been overcome. The Zinc cryptography API used by WireGuard was generally seen as a duplication of effort with the existing kernel cryptographic algorithms, so an effort to rework Zinc to use that existing code seemed destined to route around that problem and bring WireGuard to the mainline. In the six months since then, though, things have gone fairly quiet in WireGuard-land; that all changed based on a conversation at the recent Kernel Recipes conference in Paris.

[$] FPGAs and free software

Wednesday 16th of October 2019 04:11:09 PM
The problems with field-programmable gate arrays (FPGAs) is not exactly an obvious talk topic for a graphics-related conference like the 2019 X.Org Developers Conference (XDC). Ben Widawsky acknowledged that, but said that he sees parallels in the situation with FPGA support in the free-software world and the situation with graphics hardware support in the past. It is his hope that the tools for developing with FPGAs can make the same journey that graphics drivers have made over the last two decades or so.

Security updates for Wednesday

Wednesday 16th of October 2019 02:37:20 PM
Security updates have been issued by Debian (apache2 and unbound), Fedora (opendmarc, runc, and sudo), openSUSE (epiphany, GraphicsMagick, and libopenmpt), Oracle (kernel and sudo), Red Hat (java-1.8.0-openjdk, jss, kernel, kernel-rt, and kpatch-patch), SUSE (crowbar-core, crowbar-openstack, grafana, novnc, openstack-keystone, openstack-neutron, openstack-neutron-lbaas, openstack-nova, openstack-tempest, python-pysaml2, python-urllib3, rubygem-chef, rubygem-easy_diff, sleshammer, libpcap, sudo, and tcpdump), and Ubuntu (aspell and libsdl1.2).

Perl 6 renamed to Raku

Tuesday 15th of October 2019 03:29:29 PM
The pull request changing the name of Perl 6 to Raku has been merged. See the full text for more information. "This document describes the steps to be taken to effectuate a rename of 'Perl 6' to 'Raku', as described in issue #81. It does not pretend to be complete in scope or in time. To change a name of a project that has been running for 19+ years will take time, a lot of effort and a lot of cooperation. It will affect people in foreseen and unforeseen ways." (Thanks to Sean Whitton)

Security updates for Tuesday

Tuesday 15th of October 2019 02:58:33 PM
Security updates have been issued by Debian (sudo and xtrlock), openSUSE (sudo), Red Hat (Single Sign-On), Slackware (sudo), SUSE (binutils, dhcp, ffmpeg, kernel, kubernetes-salt, sudo, and tcpdump), and Ubuntu (sudo).

KDE Plasma 5.17 released

Tuesday 15th of October 2019 01:18:43 PM
The KDE project has announced the release of version 5.17 of the Plasma desktop environment. "Night Color, the color-grading system that relaxes your eyes when the sun sets, has landed for X11. Your Plasma desktop also recognizes when you are giving a presentation, and stops messages popping up in the middle of your slideshow. If you are using Wayland, Plasma now comes with fractional scaling, which means that you can adjust the size of all your desktop elements, windows, fonts and panels perfectly to your HiDPI monitor."

Python 3.8.0 released

Monday 14th of October 2019 10:15:39 PM
Version 3.8.0 of the Python language has been released. New features include the controversial assignment expressions, positional-only arguments, the Vectorcall mechanism, and more; see the what's new in Python 3.8 document for more information.

PyPy 7.2 released

Monday 14th of October 2019 07:11:30 PM
Version 7.2 of PyPy, an implementation of the Python language, is out. With this release, Python 3.6 support is deemed ready: "This release removes the 'beta' tag from PyPy3.6. While there may still be some small corner-case incompatibilities (around the exact error messages in exceptions and the handling of faulty codec errorhandlers) we are happy with the quality of the 3.6 series and are looking forward to working on a Python 3.7 interpreter."

[$] Finding race conditions with KCSAN

Monday 14th of October 2019 06:13:07 PM
Race conditions can be some of the trickiest bugs to find. The resulting problems can be subtle, and reproducing the problem in order to track it down can be difficult or impossible; often code inserted to narrow down a race condition will cause it to stop manifesting entirely. A tool that can find race conditions automatically would thus be a valuable thing for the kernel community to have. In late September, Marco Elver announced a tool called KCSAN (the Kernel Concurrency Sanitizer) that does exactly that — and which has already found a number of real problems.

Security updates for Monday

Monday 14th of October 2019 03:00:06 PM
Security updates have been issued by Arch Linux (chromium, sdl, and unbound), Debian (clamav, libdatetime-timezone-perl, openssl, tcpdump, and tzdata), Fedora (cutter-re, jackson-annotations, jackson-bom, jackson-core, jackson-databind, jackson-parent, libapreq2, ming, opendmarc, radare2, and thunderbird), openSUSE (chromium), Oracle (kernel), and SUSE (axis, jakarta-commons-fileupload, kernel, sles12sp3-docker-image, sles12sp4-image, system-user-root, and webkit2gtk3).

Kernel prepatch 5.4-rc3

Monday 14th of October 2019 01:52:12 PM
The 5.4-rc3 kernel prepatch is out for testing. "Things continue to look fairly normal, with rc3 being larger than rc2, as people are starting to find more regressions, but 5.4 so far remains on the smaller side of recent releases."

More in Tux Machines

Top 20 Best Openbox Themes for Linux System in 2019

Have you ever heard about the stacking window manager, Openbox? It is broadly used in Unix-like systems. Most probably, it’s among the most customizable parts out there. You can easily modify and beautify this with a little bit of effort. The question may arise- with what and how can you do this? Well! We are going to disclose it now. It’s by Openbox themes, which lets you have a minimalist and fantastic visual interface for your desktop manager. Read more

Fedora IoT Review

With the rise in IoT use, we are witnessing a demand for ready-made operating systems to support smart device development. Currently, the race is between proprietary versions such as IoT Plug and Play by Microsoft and open source operating systems. One such emerging open source player is Fedora which has a workstation that supports virtualization and containers. Fedora is also slated to release an Internet of Things edition called “Fedora IoT” in future. Here is a review of the open source product’s support capabilities for IoT and relevant installation details. Read more

5 Practical Examples of the Read Command in Linux

With read command, you can make your bash script interactive by accepting user inputs. Learn to use the read command in Linux with these practical examples. Read more

Programming: C++, C and Python

  • Extend C++ capabilities with LLVM STLExtras.h

    The LLVM compiler project provides a header file called STLExtras.h that extends the capabilities of C++ without any dependency on the rest of LLVM. In this article, we take a quick look at its basic functionality.

  • Rewriting Old Solaris C Code In Python Yielded A 17x Performance Improvement

    While we normally hear of rewriting code from Python and other scripting languages into C/C++ when its a matter of performance, in the case of Oracle Solaris it was taking old C code and modernizing it in Python 3 to yield a ~17x performance improvement. Shared today on Oracle's official Solaris blog was an interesting anecdote about their listusers command being rewritten in Python 3 from C. Oracle's Darren Moffat noted the C code was largely untouched since around 1988 and given its design at a time when systems were less dense than today with hundreds or even thousands of users per system.

  • Python Projects for Beginners: The Best Way to Learn

    Learning Python can be difficult. You can spend time reading a textbook or watching videos, but then struggle to actually put what you've learned into practice. Or you might spend a ton of time learning syntax and get bored or lose motivation. How can you increase your chances of success? By building Python projects. That way you're learning by actually doing what you want to do! When I was learning Python, building projects helped me bring together everything I was learning. Once I started building projects, I immediately felt like I was making more progress.

  • PyCon 2019: The People of PyCon

    I can’t tell you how amazing it was to meet the individuals I read, listen to, or who make the tools I use. I was so happy to meet the authors that helped me to grow over the last few years, especially Dan Bader, Peter Baumgartner, Matt Harrison, Reuven Lerner, Harry Percival , and Lacey Williams Henschel. I love podcasts, so it was wonderful to meet Michael Kennedy and Brian Okken in person. And I was happy to meet Paul Ganssle, Russell Keith-Magee, Barry Warsaw, and other maintainers and contributors. It was a delight to meet Bob Belderbos and Julian Sequeira from PyBites.

  • Find the first non-consecutive number with Python

    Your task is to find the first element of an array that is not consecutive. E.g. If we have an array [1,2,3,4,6,7,8] then 1 then 2 then 3 then 4 are all consecutive but 6 is not, so that’s the first non-consecutive number. If the whole array is consecutive then return None.

  • Perceiving Python programming paradigms

    Early each year, TIOBE announces its Programming Language of The Year. When its latest annual TIOBE index report came out, I was not at all surprised to see Python again winning the title, which was based on capturing the most search engine ranking points (especially on Google, Bing, Yahoo, Wikipedia, Amazon, YouTube, and Baidu) in 2018.