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Kernel: Virtualizing the Clock and Linux 4.21/5.0 Merges

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Linux
  • Virtualizing the Clock

    Dmitry Safonov wanted to implement a namespace for time information. The twisted and bizarre thing about virtual machines is that they get more virtual all the time. There's always some new element of the host system that can be given its own namespace and enter the realm of the virtual machine. But as that process rolls forward, virtual systems have to share aspects of themselves with other virtual systems and the host system itself—for example, the date and time.

    Dmitry's idea is that users should be able to set the day and time on their virtual systems, without worrying about other systems being given the same day and time. This is actually useful, beyond the desire to live in the past or future. Being able to set the time in a container is apparently one of the crucial elements of being able to migrate containers from one physical host to another, as Dmitry pointed out in his post.

    [...]

    So, there clearly are many nuances to consider. The discussion ended there, but this is a good example of the trouble with extending Linux to create virtual machines. It's almost never the case that a whole feature can be fully virtualized and isolated from the host system. Security concerns, speed concerns, and even code complexity and maintainability come into the picture. Even really elegant solutions can be shot down by, for example, the possibility of hostile users creating files with unnaturally old timestamps.

  • A Big Batch Of DRM Feature Updates Line Up Ahead Of Linux 4.21

    With the Linux 4.20 merge window having ended this past weekend, the first big batch of new feature material to DRM-Next from the "DRM-Misc" area has been submitted for the follow-on Linux 4.21 cycle.

    The DRM-Misc-Next pull request sent in this morning is on the large side as it's the first big feature pull for this area of the Direct Rendering Manager subsystem that touches the core DRM interfaces and smaller drivers.

More in Tux Machines

Today in Techrights

today's leftovers

  • Compact Bay Trail SBC has option for third GbE port
    Axiomtek’s “CAPA84E” is a 3.5-inch Bay Trail SBC with an optional third GbE port, dual M.2 slots, plus VGA, DisplayPort, USB 3.0, SATA, and -20 to 70°C support. Axiomtek’s motto may well be: “If first you succeed, iterate until you don’t.” The king of the spinoffs has released yet another iteration of one of the first Intel Bay Trail SBCs, the CAPA841, which in 2015 was followed by the slightly scaled down CAPA840. The new CAPA84R similarly supports Bay Trail and conforms to the 3.5-inch form factor, but with a different mix of features.
  • Letting people work where they want shows how much you value them
    Open organizations are inclusive. They aren't inclusive solely because it's the right way to be but because it produces better outcomes. Inclusivitiy enables a more diverse set of viewpoints.
  • Cities agree on minimal interoperability mechanisms

    Over a hundred European cities have agreed on ‘Minimal Interoperability Mechanisms’ defining the communication between software programmes and building blocks to allow co-creation and sharing of services. The MIMs, advocated by the Open & Agile Smart Cities (OASC) initiative, are “simple steps towards using new technology”, OACS chairman Martin Brynskov said on Thursday.

  • Containers On The Edge
    There are two major families for the choice of operating system and ecosystem: RTOS-based and Linux-based families. Smaller, cost-constrained devices tend to benefit from the simplicity of RTOS-based, while more full-featured and complex devices benefit from the richness of Linux (see The Shift to Linux Operating Systems for IoT for more background on the reasons for these approaches in IoT). Linux has been used in embedded devices for almost as long as it has existed (see here for an excellent timeline of early embedded Linux usage by Chris Simmons). The focus here is on Linux based products, as they have the needed functions such as access controls and memory segregation that allows for upgrading portions in a controlled fashion.
  • YouTuber Fits A Fully Functional Computer Into A Mouse
    While the YouTuber’s original plan was to squeeze a Raspberry Pi inside of a regular computer mouse but was unable to do so due to size constraints. Hence, he 3D printed a computer mouse to fit the components of the computer inside the mouse. Dubbed as “The Computer Mouse”, the device consists of a Raspberry Pi Zero W computer, a 1.5-inch color OLED LCD display with a resolution of 128 x 128 pixels, a 3D-printed mouse, a rechargeable 500 mAh battery, and a tiny Bluetooth retractable keyboard for text inputs and more complicated commands. It also has a power button at the edge to start the tiny computer. Further, it runs GNU/Linux-based operating systems such as Raspbian.
  • Microsoft Wallet for Windows Phone to be retired in February
    Support is set to end for all Windows 10 Mobile devices by the end of this year, and Microsoft is already beginning to retire apps in anticipation. In an update to the , Microsoft has noted that the app will be "officially retired" on February 28, 2019. Microsoft Wallet is the official tap-to-pay method for Windows Phones, similar to Apple Pay and Google Pay on iPhones and Android devices. The app also allows users to load up their loyalty and membership cards, allowing them all to be stored in one place.
  • mintCast 300.5 interview 5 Joe Ressington

Phoronix Test Suite Improvements

  • Making It Even Easier To Gauge Your System's Performance
    For those trying to understand their system's performance on a macro level will enjoy a new feature being introduced with Phoronix Test Suite 8.6-Spydeberg for seeing how your CPU/system/GPU/storage/network performance compares at scale to the massive data sets amassed by OpenBenchmarking.org and the Phoronix Test Suite over the past decade.
  • Phoronix Test Suite 8.6 Milestone 2 Released For Open-Source Benchmarking
    Two weeks since the initial Phoronix Test Suite 8.6 development release, the second milestone release is now available for your open-source, cross-platform benchmarking evaluation.

GNOME and KDE: GTK, KEXI, KookBook and Krita

  • Theme changes, revisited
    We’ve made a 3.24.4 release, to fix up a few oversights in 3.24.3. This release does not include the new theme yet, we will push that to the next release. We’ve also made another NewAdwaita tarball, which includes refinements based on some of the suggestions we received since last week.
  • KEXI 3.2 Beta
    Yesterday KEXI 3.2 Beta shipped, effect of improvements from entire 2018. Full info in the wiki. That's best KEXI to date! Pun intended because among other things one is especially worth mentioning, entirely new and final date/time grammar for user's SQL.
  • KookBook 0.2.1 – now actually kind of useful
    There was a snag in the KookBook 0.2.0 release, and 0.2.1 is available.
  • Krita Interview with Edgar Tadeo
    Comparing to Photoshop, I think Krita can make good digital painting that looks like it was made with a real brush. However,  PS is not a paint program, Krita’s advantage is its brushes.