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Kernel: Rust, User Events, and More

Submitted by Roy Schestowitz on Friday 29th of April 2022 09:13:23 PM Filed under
Linux
  • Rustaceans at the border

    Support for developing in the Rust language is headed toward the kernel, though just when it will land in the mainline is yet to be determined. The Rust patches are progressing, though, and beginning to attract attention from beyond the kernel community. When two languages — and two different development communities — come together, the result can be a sort of cultural clash. Some early signs of that are appearing with regard to Rust in the kernel; if the resulting impedance mismatches can be worked out, the result could be a better development environment for everybody involved.

    The latest round of Rust patches was posted by Miguel Ojeda on March 17. This time around, Rust support has moved forward to version 1.59.0 of the Rust language, which has stabilized a couple of important (for the kernel) features. The patches add a new module abstracting access to hardware random-number generators. A CString type has been added for C strings. The spinlock implementation has been improved. All told, the patch series, which can be found in the linux-next repository, adds over 35,000 lines of code and documentation; it is a considerable body of work.

    There has been no public discussion on just when these patches might be deemed ready to go into the mainline kernel. Rust support is still considered "experimental" even by its developers; that is likely to remain the case for some time (even after this work is merged into the mainline) until the language proves itself for kernel development.

  • User events — but not quite yet

    The ftrace and perf subsystems provide visibility into the workings of the kernel; by activating existing tracepoints, interested developers can see what is happening at specific points in the code. As much as kernel developers may resist the notion, though, not all events of interest on a system happen within the kernel. Administrators will often want to look inside user-space processes as well; they would be even happier with a mechanism that allows the simultaneous tracing of events in both the kernel and user space. The user-events subsystem, developed by Beau Belgrave and added during the 5.18 merge window, promises that capability, but users will almost certainly have to wait another cycle to gain access to it.

    Kernel tracepoints are hooks at specific locations in the code. They are designed to add as little overhead as possible when they are not active, which is the case most of the time. When a tracepoint is activated, it produces a stream of structured data specific to the event being monitored; user space can read that data via a number of different interfaces. By turning on just the tracepoints of interest, user space can collect the data needed to analyze a specific situation without slowing down the kernel overall.

  • Intel implements significant driver improvements for Arc Graphics into Linux 5.19

    Today, the Intel open-source engineering group delivered the initial batch of "DRM-intel-gt-next" updates to DRM-Next. This selection of DRM updates will make its way into the Linux 5.19 migration. The pull request is slated to offer additional updates and optimizations for the newest Linux kernel, coming this year.

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