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Latest in Linux 5.16

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  • AFS, 9p, Netfslib Wired Up To Use Newly-Merged Folios In Linux 5.16 - Phoronix

    Merged at the start of the Linux 5.16 cycle was the long in development memory "folios" code. That initial pull had the changes to the kernel page cache and memory management code while now before ending out the merge window is converting some file-system code to using folios.

    Migrating XFS over to folios and other larger conversions aren't expected until at least Linux 5.17. However, sent out on Thursday were the patches to convert Netfslib, 9p, and AFS to using the new memory folios support. Additionally, there is a partial conversion of the Ceph code.

  • Microsoft Has More SMB3/CIFS Enhancements For Linux 5.16, Including For Performance - Phoronix

    Another batch of SMB3/CIFS client changes were submitted and merged today for the Linux 5.16 merge window. Plus the KSMBD changes were also merged today for that in-kernel SMB3 file server.

    Steve French of Microsoft as the CIFS/CMB3 maintainer sent in this latest batch of "fixes" - although this secondary pull request wasn't limited exclusively to traditional fixes.

  • Linux 5.16 To Support AMD SEV/SEV-ES Intra-Host Live Migration - Phoronix

    Last week was the main set of Kernel-based Virtual Machine (KVM) changes for Linux 5.16 that introduced RISC-V hypervisor support and AMD PSF control bit support, among other changes. A second set of KVM changes were sent out on Friday that is headlined by having AMD SEV/SEV-ES intra-host migration support.

    With this secondary set of KVM updates for Linux 5.16, the mainline kernel can now handle intra-host migration of virtual machines leveraging Secure Encrypted Virtualization (or SEV-ES, the Encrypted State additions introduced with EPYC 7002 Rome). Live migration hasn't been supported due to the complexities and security with Secure Encryption Virtualization while now at least intra-host migration is supported for where the source and destination VM are on the same underlying server (inter-host migration is not).

Also Zstd

  • Modernized Zstd Merged Into Linux 5.16 For Much Greater Performance - Phoronix

    While Zstd is used in various areas of the Linux kernel for data compression from transparent file-system compression with the likes of Btrfs to allowing kernel modules be compressed with this Zstandard algorithm, the in-kernel code had fallen years outdated. Finally with Linux 5.16 that Zstd in-kernel implementation is now being brought up to modern standards and delivering better performance too.

    Merged on Saturday evening for Linux 5.16 is the overhauled Zstd code for the Linux kernel. This revised code has a new kernel-style wrapper API around Zstd that should also facilitate easier updates moving forward and to be automatically generated/derived from the upstream Zstd source code.

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