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[$] Preserving guest memory across kexec

The final session in the memory-management track at the 2022 Linux Storage, Filesystem, Memory-management and BPF Summit (LSFMM) was run remotely by James Gowans and David Woodhouse. It was titled "user-space control of memory mappings", with a subtitle of "letting guest memory and state survive kexec". Some options were discussed, but the real...

[$] Fixing a race in hugetlbfs

As the memory-management track at the 2022 Linux Storage, Filesystem, Memory-management and BPF Summit (LSFMM) neared its conclusion, Mike Kravetz ran a session remotely to talk about page sharing with hugetlbfs, which is a special filesystem that provides access to huge pages. (See this article series for lots of information about hugetlbfs)....

[$] get_user_pages() and COW, 2022 edition

The numerous correctness problems with the kernel's get_user_pages() functionality have been a fixture at the Linux Storage, Filesystem, Memory-management and BPF Summit (LSFMM) for some years. The 2022 event did not break that tradition. The first-day discussion on page pinning was covered here. On the final day, in the memory-management...

Security updates for Friday

Security updates have been issued by CentOS (kernel), Debian (ark, openldap, and thunderbird), Fedora (freetype and vim), Oracle (.NET 5.0, .NET 6.0, .NET Core 3.1, container-tools:3.0, glibc, kernel, rsync, and subversion:1.10), Scientific Linux (kernel), SUSE (dcraw, firefox, glib2, ImageMagick, kernel-firmware, libxml2, libyajl, php7, ucode-intel,...

Rust 1.61.0 released

Version 1.61.0 of the Rust language has been released. Changes this time around include more flexibility in main-program exit codes, a number of new features for const functions, a number of newly stabilized APIs, and more.

[$] Cleaning up dying control groups, 2022 edition

Control groups are a useful system-management feature, but they can also consume a lot of resources, especially if they hang around on the system after they have been deleted. Roman Gushchin described the problems that can result at the 2019 Linux Storage, Filesystem, Memory-management and BPF Summit (LSFMM); he returned during the 2022 LSFMM to...

[$] CXL 2: Pooling, sharing, and I/O-memory resources

During the final day of the 2022 Linux Storage, Filesystem, Memory-management and BPF Summit (LSFMM), attention in the memory-management track turned once again to the challenges posed by the upcoming Compute Express Link (CXL) technology. Two sessions looked at different problems posed by CXL memory, which can come and go over the operation of...

Huang: Rust: A Critical Retrospective

Andrew 'bunnie' Huang has posted an extensive review of the Rust language derived from the experience of writing "over 100k lines" of code. Rust is a difficult language for authoring code because it makes these "cheats" hard – as long as you have the discipline of not using "unsafe" constructions to make cheats easy. However, really hard...

Security updates for Thursday

Security updates have been issued by Fedora (microcode_ctl, rubygem-nokogiri, and vim), Mageia (htmldoc, python-django, and python-oslo-utils), Red Hat (container-tools:2.0, kernel, kernel-rt, kpatch-patch, and pcs), SUSE (ardana-barbican, grafana, openstack-barbican, openstack-cinder, openstack-heat-gbp, openstack-horizon-plugin-gbp-ui, openstack-ironic,...

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