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Kernel: Scheduler Changes, L1d Flushing, and SMB3 in Linux 5.15

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Linux
  • Scheduler Changes For Linux 5.15 - Still No Sign Of Any Intel Thread Director Optimizations - Phoronix

    Ingo Molnar began sending in his pull requests bright and early as usual for the just-opened Linux 5.15 merge window. With the scheduler changes for this next kernel version there are some improvements worth mentioning but also worth mentioning is what hasn't found its way to the kernel yet: any software optimizations around Intel Thread Director for upcoming Alder Lake processors.

    The new scheduler material for Linux 5.15 includes changes for dealing with asymmetric scheduling affinity. This asymmetric scheduling affinity is initially focused around handling of 32-bit tasks on AArch64 systems where some SoCs are having AArch64-only cores not capable of 32-bit (AArch32) execution. The scheduling changes allow defining their own CPU possible mask for tasks to ensure the scheduler will place a given task on a CPU that supports it. Again, initially all focused on the Arm front with legacy 32-bit tasks for some SoCs having 64-bit-only cores.

  • Opt-In L1 Cache Flushing To Try For Linux 5.15 To Help With The Paranoid, Future CPU Vulnerabilities - Phoronix

    Worked on for more than one year is the patches out of Amazon for allowing opt-in L1 data cache flushing on context switching. This L1d flushing is done in the name of greater security given the various CPU speculative execution hardware vulnerabilities these days and protecting against other possible future vulnerabilities. After trying to get the code merged last summer, Linus Torvalds called it "beyond stupid" and reverted the code but now for Linux 5.15 a revised form of it was submitted.

  • In-Kernel SMB3 File Server Looks To Land In Linux 5.15 - Phoronix

    One of the very first pull requests for Linux 5.15 now that its merge window is open following the Linux 5.14 release is to merge KSMBD, the in-kernel SMB3 protocol file server.

    KSMBD is an in-kernel SMB3 server developed by Samsung and focused on delivering high performance and new features. Features around RDMA usage is one of the areas KSMBD is planning to embrace as it can be more easily achieved via kernel space rather than the large Samba project in user-space. KSMBD aims to have a much smaller footprint in general than the well known Samba project for SMB/CIFSS support on Linux and other non-Windows platforms.

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