The BPF extensible scheduler class [LWN.net]
It was only a matter of time before somebody found a way to inject BPF into the CPU scheduler. This patch series, posted by Tejun Heo and containing work by David Vernet, Josh Don, and Barret Rhoden, does exactly that. The cover letter covers the motivation behind this work in detail: One of our main goals was to lower the barrier to entry for experimenting with the scheduler. sched_ext provides e
[RFC PATCH 0/4] namespacefs: Proof-of-Concept [LWN.net]
viro-AT-zeniv.linux.org.uk, ebiederm-AT-xmission.com, rostedt-AT-goodmis.org, mingo-AT-redhat.com, hagen-AT-jauu.net, rppt-AT-kernel.org, James.Bottomley-AT-HansenPartnership.com, akpm-AT-linux-foundation.org, vvs-AT-virtuozzo.com, shakeelb-AT-google.com, christian.brauner-AT-ubuntu.com, mkoutny-AT-suse.com, "Yordan Karadzhov (VMware)" <y.karadz-AT-gmail.com> We introduce a simple read-only virtua
The multi-generational LRU [LWN.net]
Did you know...?LWN.net is a subscriber-supported publication; we rely on subscribers to keep the entire operation going. Please help out by buying a subscription and keeping LWN on the net. One of the key tasks assigned to the memory-management subsystem is to optimize the system's use of the available memory; that means pushing out pages containing unused data so that they can be put to better u
Debian's which hunt [LWN.net]
LWN.net needs you!Without subscribers, LWN would simply not exist. Please consider signing up for a subscription and helping to keep LWN publishing One does not normally expect to see a great deal of angst over a one-page shell script, even on the Internet. But Debian is special, so it has been having an extended discussion over the fate of the which command that has been escalated to the Debian T
A viable solution for Python concurrency [LWN.net]
This article brought to you by LWN subscribersSubscribers to LWN.net made this article — and everything that surrounds it — possible. If you appreciate our content, please buy a subscription and make the next set of articles possible. Concerns over the performance of programs written in Python are often overstated — for some use cases, at least. But there is no getting around the problem imposed b
Rolling stable kernels [LWN.net]
This article brought to you by LWN subscribersSubscribers to LWN.net made this article — and everything that surrounds it — possible. If you appreciate our content, please buy a subscription and make the next set of articles possible. Sasha Levin, one of the maintainers of the stable kernels, gave a presentation at Open Source Summit North America 2021 on a proposal for a different way to handle t
Running code within another process's address space [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! One of the key resources that defines a process is its address space — the set of mappings that determines what any specific memory address means within t
A futex overview and update [LWN.net]
This article brought to you by LWN subscribersSubscribers to LWN.net made this article — and everything that surrounds it — possible. If you appreciate our content, please buy a subscription and make the next set of articles possible. The futex [PDF] mechanism, introduced in 2.5.7 by Rusty Russell, Hubertus Franke, and Mathew Kirkwood, is a fast, lightweight kernel-assisted locking primitive for u
Adding Processor Trace support to Linux [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! Tracing is a technique that is used for both performance analysis and debugging. A tracer generates its data into a log; these are tracing events that can
![Adding Processor Trace support to Linux [LWN.net]](https://cdn-ak-scissors.b.st-hatena.com/image/square/b3a7aef5d3e47a4653f2f6d9dcf7dd546df39218/height=288;version=1;width=512/https%3A%2F%2Flwn.net%2Fimages%2F2015%2Fpt-flamegraph-sm.png)
Comparing SystemTap and bpftrace [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! There are times when developers and system administrators need to diagnose problems in running code. The program to be examined can be a user-space proces
[RFC PATCH v3 0/8] Count rlimits in each user namespace [LWN.net]
Alexey Gladkov <legion-AT-kernel.org>, Andrew Morton <akpm-AT-linux-foundation.org>, Christian Brauner <christian.brauner-AT-ubuntu.com>, "Eric W . Biederman" <ebiederm-AT-xmission.com>, Jann Horn <jannh-AT-google.com>, Jens Axboe <axboe-AT-kernel.dk>, Kees Cook <keescook-AT-chromium.org>, Linus Torvalds <torvalds-AT-linux-foundation.org>, Oleg Nesterov <oleg-AT-redhat.com> Preface ------- These p
Using user-space tracepoints with BPF [LWN.net]
Please consider subscribing to LWNSubscriptions are the lifeblood of LWN.net. If you appreciate this content and would like to see more of it, your subscription will help to ensure that LWN continues to thrive. Please visit this page to join up and keep LWN on the net. Much has been written on LWN about dynamically instrumenting kernel code. These features are also available to user-space code wit
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Hybrid scheduling gets more complicated [LWN.net]
The balance between features and performance in the block layer [LWN.net]
Adding package information to ELF objects [LWN.net]
Spectre revisits BPF [LWN.net]
Implementing eBPF for Windows [LWN.net]
Sticky groups in the shadows [LWN.net]
Introduce BPF_MAP_TYPE_REUSEPORT_SOCKARRAY and BPF_PROG_TYPE_SK_REUSEPORT [LWN.net]
Bounded loops in BPF for the 5.3 kernel [LWN.net]