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Linux 5.4 Development, PRs, Merges

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Linux
  • BLK-IOCOST Merged For Linux 5.4 To Better Account For Cost Of I/O Workloads

    BLK-IOCOST is a new I/O controller by veteran kernel developer Tejun Heo that is a work-conserving proportional controller. He goes over blk-iocost in great detail in one of the earlier patch series, "It currently has a simple linear cost model builtin where each IO is classified as sequential or random and given a base cost accordingly and additional size-proportional cost is added on top. Each IO is given a cost based on the model and the controller issues IOs for each cgroup according to their hierarchical weight. By default, the controller adapts its overall IO rate so that it doesn't build up buffer bloat in the request_queue layer, which guarantees that the controller doesn't lose significant amount of total work...The controller provides extra QoS control knobs which allow tightening control feedback loop as necessary." See that aforelinked article for more details and results.

  • Btrfs & XFS File-Systems See More Fixes With Linux 5.4

    The mature XFS and Btrfs file-systems continue seeing more fixes and cleaning with the now in-development Linux 5.4 kernel.

    On the Btrfs front the Linux 5.4 changes are summed up as "work on code refactoring, sanity checks and space handling. There are some less user visible changes, nothing that would particularly stand out." The Btrfs changes include deprecating a few items as well as improving the exposure of debugging information via sysfs. See the pull request for all the Btrfs file-system fixes and changes this round.

  • Linux 5.4 DRM Pull Submitted With AMD Navi 12/14, Arcturus & Renoir Plus Intel Tigerlake

    While we've known about the many features for a while if you are a faithful Phoronix reader, today the Direct Rendering Manager (DRM) graphics driver changes were sent in for the Linux 5.4 kernel.

EXT4 Brings New Debugging Ioctls For Linux 5.4

  • EXT4 Brings New Debugging Ioctls For Linux 5.4

    Like the mostly mundane Btrfs and XFS changes with the Linux 5.4 merge window, the EXT4 file-system activity is mostly focused on fixes too but also new debugging ioctls.

    One of the interesting changes with Linux 5.4 for EXT4 is the dropping of a workaround for handling pre-1970 dates that were incorrectly encoded on kernels prior to Linux 4.4 for file timestamps. Since then the kernel has correctly generated the pre-1970 dates and e2fsck is also able to fix the issue now for several years, this workaround has now been dropped -- not that you probably have any pre-1970 timestamps for files on your system. For those curious, the encoding bug led to the timestamps as being in the 24th century.

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More in Tux Machines

Graphics and Standards

  • SHADERed 1.2.3 Released With Support For 3D Textures & Audio Shaders

    SHADERed is the open-source, cross-platform project for creating and testing HLSL/GLSL shaders. While a version number of 1.2.3 may not seem like a big update, some notable additions can be found within this new SHADERed release.

  • Vulkan 1.1.125 Released With SPIR-V 1.4 Support

    Succeeding Vulkan 1.1.124 one week later is now Vulkan 1.1.125 with a lone new extension. Vulkan 1.1.125 has its usual clarifications and corrections to this graphics API specification. Meanwhile the new extension introduced in the overnight v1.1.125 release is VK_KHR_spirv_1_4.

  • Making Movies Accessible for Everyone

    For the first time, people who are deaf or hard of hearing will be able to enjoy the Nairobi leg of the Human Rights Watch Film Festival, opening on October 15.

New Videos: A Look at Xubuntu 19.10 and Crunchbang++ 10

Debian and Ubuntu Leftovers

  • Ritesh Raj Sarraf: Bpfcc New Release

    bpfcc version 0.11.0 has been uploaded to Debian Unstable and should be accessible in the repositories by now. After the 0.8.0 release, this has been the next one uploaded to Debian.

  • Utkarsh Gupta: Joining Debian LTS!

    Back during the good days of DebConf19, I finally got a chance to meet Holger! As amazing and inspiring a person he is, it was an absolute pleasure meeting him and also, I got a chance to talk about Debian LTS in more detail. [...] I had almost no idea what to do next, so the next month I stayed silent, observing the workflow as people kept committing and announcing updates. And finally in September, I started triaging and fixing the CVEs for Jessie and Stretch (mostly the former). Thanks to Abhijith who explained the basics of what DLA is and how do we go about fixing bugs and then announcing them. With that, I could fix a couple of CVEs and thanks to Holger (again) for reviewing and sponsoring the uploads! :D

  • Ubucon Europe 2019 in local media

    News from the new Ubuntu distribution, the exploration of the several platforms and many “how to”, rule the 4-days agenda where the open source and open technologies are in the air. The Olga Cadaval Cultural centre in Sintra, is the main stage of a busy agenda filled with several talks and more technical sessions, but at Ubucon Europe there’s also room for networking and cultural visits, a curious fusion between spaces full of history, like the Pena Palace or the Quinta da Regaleira, and one of the youngest “players” in the world of software. For 4 days, the international Ubuntu Community gathers in Sintra for an event open to everyone, where the open source principles and open technology are dominating. The Ubucon Europe Conference begun Thursday, October 10th, and extends until Sunday, October 13th, keeping an open doors policy to everyone who wants to Afterall, what is the importance of Ubucon? The number of participants, which should be around 150, doesn’t tell the whole story of what you can learn during these days, as the SAPO TEK had the opportunity to check this morning. Organised by the Ubuntu Portugal Community, with the National Association for Open Software, the Ubuntu Europe Federation and the Sintra Municipality, the conference brings to Portugal some of the biggest open source specialists and shows that Ubuntu is indeed alive, even if not yet known by most people, and still far from the “world domain” aspired by some.

Devices/Embedded: Win Enterprises and Raspberry Pi 4

  • Win Enterprises unveils Atom-based LAN gateway and compact SBC

    Win Enterprises unveiled a fanless “PL-82000” networking gateway with 6x GbE and 2x SFP ports based on an Atom C3000. It also launched a Raspberry Pi sized “MB-5000” SBC that runs Ubuntu or Win 10 on Intel Apollo Lake. We tend to forget Win Enterprises because as its name suggests, the company typically sticks to Windows-supported products. Yet, they have increasingly produced barebones products without listed OS support, such as the new PL-82000 networking appliance, as well as Linux supported systems such as the MB-5000 SBC announced back in June. (In 2017, we covered an Intel Bay Trail based MB-80580 SBC and Win IoT-380 Gateway with Linux support.)

  • Raspberry Pi 4 PCI Express: It actually works! USB3, SATA… GPUs?

    Recently, Tomasz Mloduchowski posted a popular article on his blog detailing the steps he undertook to get access to the hidden PCIe interface of Raspberry Pi 4: the first Raspberry Pi to include PCIe in its design. After seeing his post, and realizing I was meaning to go buy a Raspberry Pi 4, it just seemed natural to try and replicate his results in the hope of taking it a bit further. I am known for Raspberry Pi Butchery, after all.

  • Raspberry Pi 4 B+ - PCI Express

    Why did I do it? Because I wanted to see if it can be done. Because Raspberry Pi 4 might be the cheapest device that is PCIe capable after a relatively minor modification (if I didn't lift the capacitors when desoldering the VL805, this is literally 12 soldering points). That, in turn, can be quite handy for developing own PCIe cores for various FPGA based experiments.

    I'm sharing it to allow people to learn from this - and to dispel the myth that PCIe is somehow out of reach of hobbyists due to some concerns over signal integrity or complexities. Stay tuned for more Pi4/PCIe experimentation!