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Kernel: OpenZFS, Legacy Framebuffers, Rust, and Improved Retpoline Code

Submitted by Roy Schestowitz on Wednesday 10th of November 2021 09:28:44 PM Filed under
Linux
  • OpenZFS 3.0 Could See macOS Support & DirectIO, While ZFS For Windows Continues - Phoronix

    The annual OpenZFS Developer Summit wrapped up yesterday with interesting talks on this open-source, cross-platform ZFS file-system implementation.

    ZFS co-creator Matt Ahrens kicked things off as usual, including touching on future work and possible expectations for OpenZFS 3.0. Given the annual major release cadence, OpenZFS 3.0 is up next for the project that currently has support for Linux and FreeBSD systems. Some of the possible features expressed for OpenZFS 3.0 include macOS support, DirectIO, RAIDZ expansion, Linux namespaces, ZFS on object store, FIEMAP, VDEV properties, async DMU, and more. We'll see though next year ultimately what pans out for the next ZFS release.

  • DirectIO For OpenZFS Shows Very Promising Performance - Phoronix

    Running the past two days was the annual OpenZFS Developer Summit. One of the most interesting presentations from this virtual event was on the status of DirectIO (O_DIRECT) support for the OpenZFS file-system and the performance boost it can offer in relevant areas.

    Brian Atkinson of the Los Alamos National Laboratory presented at the developer summit around the DirectIO support for OpenZFS. The work ultimately boils down to the DirectIO merge request open for OpenZFS since February 2020. This support aims to allow bypassing ZFS' ARC when issuing reads/writes with a particular focus on improving the performance for Zpools on NVMe solid-state drives as well as other cases where ARC just gets in the way.

  • Kernel 5.10.78 with legacy framebuffers

    I am having success with fixing Firefox, will post about that later. For now want to document a little experiment; the linux kernel configured to use efifb and vesafb.

  • Where Rust fits into Linux • The Register

    Opinion To become a Linux developer, you used to need C as your passport. Now Rust can let you be an OS programmer as well.

    The joke goes: "C combines the power and performance of assembly language with the flexibility and ease-of-use of assembly language." Having programmed in both C and IBM 360 Assembler – it was a long time ago, OK – there's something to that. Because of its power, performance, and portability, C became the operating system language of choice, including, of course, Linux.

  • Improved Retpoline Code In The Linux 5.16 Kernel - Phoronix

    Merged last week into the Linux 5.16 kernel is improved Retpoline "return trampoline" code.

    Phoronix readers should be very familiar with Retpolines by now as being used for Spectre Variant Two mitigations. This improved Retpoline code in Linux 5.16 as part of the "objtool/core" changes rewrites Retpolines to indirect instructions in situations where Retpolines are not enabled. There is also a change for rewriting an indirect LFENCE for the AMD handling. The x86 BPF code is also better handled around its Retpoline behavior.

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