Basic Rust Support Merged For Upcoming Linux 6.1

“This Monday, the first set of patches to enable Rust support and tooling was merged for Linux 6.1,” writes Slashdot reader sabian2008, sharing an update from longtime kernel developer Kees Cook: The tree has a recent base, but has fundamentally been in linux-next for a year and a half. It’s been updated based on feedback from the Kernel Maintainer’s Summit, and to gain recent Reviewed-by: tags. Miguel is the primary maintainer, with me helping where needed/wanted. Our plan is for the tree to switch to the standard non-rebasing
practice once this initial infrastructure series lands. The contents are the absolute minimum to get Rust code building in the
kernel, with many more interfaces[2] (and drivers — NVMe[3], 9p[4], M1 GPU[5]) on the way.

The initial support of Rust-for-Linux comes in roughly 4 areas:

– Kernel internals (kallsyms expansion for Rust symbols, %pA format)

– Kbuild infrastructure (Rust build rules and support scripts)

– Rust crates and bindings for initial minimum viable build

– Rust kernel documentation and samples Further reading: Linux 6.0 Arrives With Support For Newer Chips, Core Fixes, and Oddities

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The Latest iPadOS 16 Beta Brings Stage Manager To Older iPad Pro Models

Apple is bringing Stage Manager, a new multitasking system exclusive to iPads with the M1 chip, to a number of older devices. Engadget reports: Probably the biggest change Apple announced with iPadOS 16 earlier this year is Stage Manager, a totally new multitasking system that adds overlapping, resizable windows to the iPad. That feature also works on an external display, the first time that iPads could do anything besides mirror their screen on a monitor. Unfortunately, the feature was limited to iPads with the M1 chip — that includes the 11- and 12.9-inch iPad Pro released in May of 2021 as well as the M1-powered iPad Air which Apple released earlier this year. All other older iPads were left out.

That changes with the latest iPadOS 16 developer beta, which was just released. Now, Apple is making Stage Manager work with a number of older devices: it’ll work on the 11-inch iPad Pro (first generation and later) and the 12.9-inch iPad Pro (third generation and later). Specifically, it’ll be available on the 2018 and 2020 models that use the A12X and A12Z chips rather than just the M1. However, there is one notable missing feature for the older iPad Pro models — Stage Manager will only work on the iPad’s build-in display. You won’t be able to extend your display to an external monitor. Apple also says that developer beta 5 of iPadOS 16. is removing external display support for Stage Manager on M1 iPads, something that has been present since the first iPadOS 16 beta was released a few months ago. It’ll be re-introduced in a software update coming later this year.

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Linux 6.0 Arrives With Performance Improvements and More Rust Coming

Linux creator Linus Torvalds has announced the first release candidate for the Linux kernel version 6.0, but he says the major number change doesn’t signify anything especially different about this release. ZDNet: While there is nothing fundamentally different about this release compared with 5.19, Torvalds noted that there were over 13,500 non-merge commits and over 800 merged commits, meaning “6.0 looks to be another fairly sizable release.” According to Torvalds, most of the updates are improvements to the GPU, networking and sound. Torvalds stuck to his word after releasing Linux kernel 5.19 last month, when he flagged he would likely call the next release 6.0 because he’s “starting to worry about getting confused by big numbers again.”

On Sunday’s release of Linux 6.0 release candidate version 1 (rc-1), he explained his reasoning behind choosing a new major version number and its purpose for developers. Again, it’s about avoiding confusion rather than signaling that the release has major new features. His threshold for changing the lead version number was .20 because it is difficult to remember incremental version numbers beyond that. “Despite the major number change, there’s nothing fundamentally different about this release – I’ve long eschewed the notion that major numbers are meaningful, and the only reason for a ‘hierarchical; numbering system is to make the numbers easier to remember and distinguish,” said Torvalds. Torvalds lamented some Rust-enabling code didn’t make it into the release. The Register adds: “I actually was hoping that we’d get some of the first rust infrastructure, and the multi-gen LRU VM, but neither of them happened this time around,” he mused, before observing “There’s always more releases. This is one of those releases where you should not look at the diffstat too closely, because more than half of it is yet another AMD GPU register dump,” he added, noting that Intel’s Gaudi2 Ai processors are also likely to produce plenty of similar kernel additions. “The CPU people also show up in the JSON files that describe the perf events, but they look absolutely tiny compared to the ‘asic_reg’ auto-generated GPU and AI hardware definitions,” he added.

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NetBSD 9.3: A 2022 OS That Can Run On Late-1980s Hardware

Version 9.3 of NetBSD is here, able to run on very low-end systems and with that authentic early-1990s experience. The Register reports: Version 9.3 comes some 15 months after NetBSD 9.2 and boasts new and updated drivers, improved hardware support, including for some recent AMD and Intel processors, and better handling of suspend and resume. The next sentence in the release announcement, though, might give some readers pause: “Support for wsfb-based X11 servers on the Commodore Amiga.” This is your clue that we are in a rather different territory from run-of-the-mill PC operating systems here. A notable improvement in NetBSD 9.3 is being able to run a graphical desktop on an Amiga. This is a 2022 operating system that can run on late-1980s hardware, and there are not many of those around.

NetBSD supports eight “tier I” architectures: 32-bit and 64-bit x86 and Arm, plus MIPS, PowerPC, Sun UltraSPARC, and the Xen hypervisor. Alongside those, there are no less than 49 “tier II” supported architectures, which are not as complete and not everything works — although almost all of them are on version 9.3 except for the version for original Acorn computers with 32-bit Arm CPUs, which is still only on NetBSD 8.1. There’s also a “tier III” for ports which are on “life support” so there may be a risk Archimedes support could drop to that. This is an OS that can run on 680×0 hardware, DEC VAX minicomputers and workstations, and Sun 2, 3, and 32-bit SPARC boxes. In other words, it reaches back as far as some 1970s hardware. Let this govern your expectations. For instance, in VirtualBox, if you tell it you want to create a NetBSD guest, it disables SMP support.

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Older iPads May Soon Be Able To Run Linux

Older iPads with the Apple A7- and A8-based chips may soon be able to run Linux. “Developer Konrad Dybcio and a Linux enthusiast going by “quaack723″ have collaborated to get Linux kernel version 5.18 booting on an old iPad Air 2, a major feat for a device that was designed to never run any operating system other than Apple’s,” reports Ars Technica. From the report: The project appears to use an Alpine Linux-based distribution called “postmarketOS,” a relatively small but actively developed distribution made primarily for Android devices. Dybcio used a “checkm8” hashtag in his initial tweet about the project, strongly implying that they used the “Checkm8” bootrom exploit published back in 2019 to access the hardware. For now, the developers only have Linux running on some older iPad hardware using A7 and A8-based chips — this includes the iPad Air, iPad Air 2, and a few generations of iPad mini. But subsequent tweets imply that it will be possible to get Linux up and running on any device with an A7 or A8 in it, including the iPhone 5S and the original HomePod.

Development work on this latest Linux-on-iDevices effort is still in its early days. The photos that the developers shared both show a basic boot process that fails because it can’t mount a filesystem, and Dybcio notes that basic things like USB and Bluetooth support aren’t working. Getting networking, audio, and graphics acceleration all working properly will also be a tall order. But being able to boot Linux at all could draw the attention of other developers who want to help the project.

Compared to modern hardware with an Apple M1 chip, A7 and A8-powered devices wouldn’t be great as general-purpose Linux machines. While impressive at the time, their CPUs and GPUs are considerably slower than modern Apple devices, and they all shipped with either 1GB or 2GB of RAM. But their performance still stacks up well next to the slow processors in devices like the Raspberry Pi 4, and most (though not all) A7 and A8 hardware has stopped getting new iOS and iPadOS updates from Apple at this point; Linux support could give some of these devices a second life as retro game consoles, simple home servers, or other things that low-power Arm hardware is good for. Further reading: Linux For M1 Macs? First Alpha Release Announced for Asahi Linux

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FreeBSD 13.1 Released

FreeBSD 13.1 has been released today. Some of the new features include UEFI boot improvements for AMD64, a wide variety of hardware driver improvements, and support for freebsd-update to allow creating automated snapshots of the boot environment to try to make operating system updates foolproof. Phoronix reports: Some of the other changes with FreeBSD 13.1 include enabling Position Independent Executable (PIE) support by default on 64-bit architectures, a new “zfskeys” service script for the automatic decryption of ZFS datasets, NVMe emulation with Bhyve hypervisor, chroot now supports unprivileged operations, various POWER and RISC-V improvements, big endian support improvements, support for the HiFive Unmatched RISC-V development board, updating against OpenZFS file-system support upstream, and many other changes throughout this BSD open-source ecosystem. Downloads and the full change-log for FreeBSD 13.1 can be found here.

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System76-Scheduler Is a New Pop!_OS Rust Effort To Improve Desktop Responsiveness

slack_justyb writes: “Quietly making its v1.0 debut yesterday was system76-scheduler as a Rust-written daemon aiming to improve Linux desktop responsiveness and catering to their Pop!_OS distribution,” reports Phoronix.

The daemon will work with the kernel’s CFS scheduler to give priority to components that System76 deems important for its distro. Out of the box, the scheduler will assign priority to the X.Org Server and desktop window managers/compositors, while pushing compilers and other background tasks lower. However, the scheduler will be configurable via Rusty Object Notation (RON) files found in /etc/system76-scheduler/assignments/ and /usr/share/system76-scheduler/assignments/.

Over on the GitHub page for the project, the team indicates that they are indeed making a trade-off from the default CFS to benefit Desktop configurations over the typical load a server might see.

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