3 év 1 hónap óta
In a keynote at
PyCon 2022 in Salt
Lake City, Utah, Peter Wang introduced another entrant in the field of
in-browser Python interpreters. The Python community has long sought a way
to be able to write Python—instead of JavaScript—to run in web browsers, and there
have been various efforts to do so over the years. Wang announced
PyScript as a new framework, built atop
one of those earlier projects, to allow
Python scripting directly within the browser; those programs have access to
much of the existing Python ecosystem as well as being able to interact
with the browser document object model (DOM) directly.
In addition, he gave some rather eye-opening demonstrations as part of the talk.
jake
3 év 1 hónap óta
corbet
3 év 1 hónap óta
Security updates have been issued by Debian (exo and ntfs-3g), Fedora (collectd, golang-github-cli-gh, grub2, qemu, and xen), Red Hat (httpd:2.4, kernel, and postgresql), SUSE (drbd, fwupdate, neomutt, and trivy), and Ubuntu (apache2, openssl, openssl1.0, and qemu).
corbet
3 év 1 hónap óta
Linux Plumbers Conference 2022 is pleased to host the CPU Isolation Microconference
CPU Isolation is an ability to shield workloads with extreme latency or performance requirements from interruptions (also known as Operating System noise) provided by a close combination of several kernel and userspace components. An example of such workloads are DPDK use cases in Telco/5G where even the shortest interruption can cause packet losses, eventually leading to exceeding QoS requirements.
Despite considerable improvements in the last few years towards implementing full CPU Isolation (nohz_full, rcu_nocb, isolcpus, etc.), there are issues to be addressed, as it is still relatively simple to highlight sources of OS noise just by running synthetic workloads mimicking polling (always running) type of application similar to the ones mentioned above.
There were recent improvements and discussions about CPU isolation features on LKML, and tools such as osnoise tracer and rtla osnoise improved the CPU isolation analysis. Nevertheless, this is an ongoing process, and discussions are needed to speed up solutions for existing issues and to improve the existing tools and methods.
The purpose of CPU Isolation MC is to get together to discuss open problems, most notably: how to improve the identification of OS noise sources, how to track them publicly and how to tackle the sources of noise that have already been identified.
A non exhaustive list of potential topics is:
- OS noise profiling (format and public DB for the community)
- Tracing to detect OS noise: the rtla osnoise tracer and what it’s missing
- TLB/icache flush deferral
- Extend cpuset v2 CPU partition feature to replace isolcpus kernel command line
- rt-trace-bpf tool
- Task isolation
- smp_call_function API improvements
Please come and join us in the discussion about CPU isolation.
We hope to see you there!
3 év 1 hónap óta
Because we ran out of places so fast, we are setting up a waitlist for in-person registration (virtual attendee places are still available). Please fill in this form and try to be clear about your reasons for wanting to attend. This year we’re giving waitlist priority to new attendees and people expected to contribute content. We expect to be able to accept our first group of attendees from the waitlist in mid July.
3 év 2 hónap óta
In the final filesystem session at the
2022 Linux Storage,
Filesystem, Memory-management and BPF Summit (LSFMM), David Howells led
a discussion on a filesystem optimization that is causing various kinds of
problems. Extent-based filesystems have data structures that sometimes do
not reflect the holes
that exist in files. Reads from holes in sparse files (i.e. files with
holes) must return zeroes, but filesystems are not obligated to maintain knowledge of
the holes beyond that, which leads to the problems.
This concludes our coverage of LSFMM 2022.
jake
3 év 2 hónap óta
Frederic Cambus (fcambus@)
has written a
blog entry
regarding the significant differences between the versions of
LLVM in
base and
ports.
3 év 2 hónap óta
Security updates have been issued by Debian (tzdata), Oracle (cups), and SUSE (atheme, golang-github-prometheus-alertmanager, golang-github-prometheus-node_exporter, node_exporter, python36, release-notes-susemanager, release-notes-susemanager-proxy, SUSE Manager 4.1.15 Release Notes, SUSE Manager Client Tools, and SUSE Manager Server 4.2).
corbet
3 év 2 hónap óta
This
Meta blog post by Johannes Weiner and Dan Schatzberg describes a set of
memory-management changes used there that they call "transparent memory
offloading".
Transparent Memory Offloading (TMO) is Meta’s solution for
heterogeneous data center environments. It introduces a new Linux
kernel mechanism that measures the lost work due to resource
shortage across CPU, memory, and I/O in real time. Guided by this
information and without any prior application knowledge, TMO
automatically adjusts the amount of memory to offload to a
heterogeneous device, such as compressed memory or an SSD.
The article doesn't say where to find the relevant code, not all of which
is in the mainline kernel (and some of which runs in user space).
corbet
3 év 2 hónap óta
I recently had cause to reflect on the changes to the
NFS (Network File
System) protocol over the years and found that it was a story worth
telling. It would be easy for such a story to become swamped by the
details, as there are many of those, but one idea does stand out from
the rest. The earliest version of NFS has been described as a
"stateless" protocol, a term I still hear used occasionally. Much of
the story of NFS follows the growth in the acknowledgment of, and
support for, state. This article looks at the evolution of NFS (and its
handling of state) during the
early part of its life; a second installment will bring the story up to the
present.
corbet
3 év 2 hónap óta
Security updates have been issued by Debian (cyrus-imapd, exo, sleuthkit, slurm-wlm, vim, and vlc), Fedora (golang-github-docker-libnetwork, kernel, moby-engine, ntfs-3g-system-compression, python-cookiecutter, python2.7, python3.6, python3.7, python3.8, python3.9, rubygem-mechanize, and webkit2gtk3), Mageia (bluez, dnsmasq, exempi, halibut, and php), Oracle (.NET 6.0, .NET Core 3.1, and xz), SUSE (chafa, firejail, kernel, python-Twisted, and tensorflow2), and Ubuntu (intel-microcode).
jake
3 év 2 hónap óta
The
5.19-rc3 kernel prepatch is out for
testing. "5.19-rc3 is fairly small, and just looking at the diffstat, a lot of
it ends up being in the documentation subdirectory. With another chunk
in selftests."
corbet
3 év 2 hónap óta
3 év 2 hónap óta
Linux Plumbers Conference 2022 is pleased to host the IoT Microconference
The IoT microconference is back for its fourth year and our Open Source HW / SW / FW communities are productizing Linux and Zephyr in ways that we have never seen before.
A lot has happened in the last year to discuss and bring forward:
- The Zephyr Project released LTSv2
- PyFive went from concept to an Open Source Silicon SoC via Google’s eFabless shuttle. How will Open Source Silicon affect IoT?
- Apache Thrift running in Zephyr. A new entry in the IoT toolbox.
- Linux-wpan gains mac802154 support for scanning, beaconing and coordinator handling
- The Sound Open Firmware (SoF) project combines Linux ASOC drivers with Zephyr audio DSP firmware
- The Oniro Project breaks ground with a Matter + OpenThread gateway blueprint
- A Matter open source project is being actively developed..
- Linux-and-Zephyr-based products built with Yocto..
Each of the above items were large efforts made by Linux centric communities actively pushing the bounds of what is possible in IoT.
Whether you are an apprentice or master, we welcome you to bring your plungers and join us for a deep dive into the pipework of Linux IoT!
We hope to see you there!
3 év 2 hónap óta
Some kernel features last longer than others. Support for forward-edge
control-flow integrity (CFI) for kernels compiled with LLVM was added to the 5.13
kernel, but now there is already a replacement knocking on the door.
Control-flow integrity will remain, but the new implementation will be
significantly different — and seemingly better in a number of ways.
corbet
3 év 2 hónap óta
The Tor Project has
released a new
annual report.
One element of this year's work that inspires me, and shows the
power of the Tor community, is the response to the internet
censorship in Russia and Ukraine. The entire Tor community
immediately jumped into action to keep people online. Seeing this
passion in action, while keeping tens of thousands of Russians
connected to the open internet, has been inspiring.
corbet
3 év 2 hónap óta
Security updates have been issued by Fedora (kernel, liblouis, ntfs-3g, php, shim, shim-unsigned-aarch64, shim-unsigned-x64, thunderbird, and vim), Mageia (chromium-browser-stable and golang), Red Hat (grub2, mokutil, and shim and grub2, mokutil, shim, and shim-unsigned-x64), SUSE (389-ds, apache2, kernel, mariadb, openssl, openssl-1_0_0, rubygem-actionpack-5_1, rubygem-activesupport-5_1, and vim), and Ubuntu (exempi, kernel, linux, linux-aws, linux-aws-hwe, linux-aws-5.13, linux-aws-5.4, linux-azure, linux-azure-4.15, linux-azure-5.13, linux-azure-5.4, linux-azure-fde, linux-dell300x, linux-gcp, linux-gcp-4.15, linux-gcp-5.13, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe, linux-hwe-5.13, linux-hwe-5.4, linux-ibm, linux-ibm-5.4, linux-intel-5.13, linux-intel-iotg, linux-kvm, linux-lowlatency, linux-oracle, linux-oracle-5.13, linux-oracle-5.4, and spip).
jake
3 év 2 hónap óta
Fedora's objective to become the desktop Linux distribution of choice has
long been hampered by Red Hat's risk-averse legal department, which
strictly limits the type of software that Fedora can ship. Specifically,
anything that might be encumbered by patents is off-limits, with the result
that much of the media that users might find on the net is unplayable. This
situation has improved over the years as the result of a lot of work within
the Fedora project, but it still puts Fedora at a disadvantage relative to
some other distributions. A recent
discussion on video support, though, shines a light on how some surprising
legal reasoning may be providing a way out of this problem; that way
may not be pleasing to all involved, however.
corbet
3 év 2 hónap óta
jake
3 év 2 hónap óta
Security updates have been issued by Fedora (containerd, golang-github-containerd-cni, golang-github-containernetworking-cni, golang-x-sys, kernel, and qt5-qtbase), Oracle (kernel, kernel-container, microcode_ctl, subversion:1.14, and xz), Red Hat (.NET 6.0, .NET Core 3.1, cups, and xz), Scientific Linux (xz), SUSE (caddy, chromium, librecad, libredwg, varnish, and webkit2gtk3), and Ubuntu (bluez).
jake