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Linux kernel core dumps are often critical for diagnosing and fixing problems with the OS. We’ve published several blogs related to kernel core dumps, including how to generate them, how to estimate their size, how to analyze them with Drgn, and even how to manually extract stack function arguments from them. But have you ever wondered what’s really in a core dump? In this blog, we’ll answer that
or Learning not to hate conflict resolution If you’re a developer working on new features, you may never have to deal with backporting patches in your day-to-day work. However, you may occasionally find yourself in a situation where you need to backport a patch to an older version, maybe a security fix that needs to be applied to older versions that are still in use. You may thus find yourself in
Executive Summary Oracle is making the industry leading Oracle JDK available for free, including all quarterly security updates. This includes commercial and production use. The new license is the "Oracle No-Fee Terms and Conditions" (NFTC) license. This license for the Oracle JDK, subject to the conditions, permits free use for all users, even commercial and production use. Redistribution is p
Notes on BPF (3) - How BPF communicates with userspace - BPF maps, perf events, bpf_trace_printk Oracle Linux kernel developer Alan Maguire presents this six-part series on BPF, wherein he presents an in depth look at the kernel's "Berkeley Packet Filter" -- a useful and extensible kernel function for much more than packet filtering. We've seen how userspace sets up BPF programs, but once a progra
Have you always wanted to learn how to implement tracepoints in the Linux Kernel? Then this blog is for you. Oracle Linux kernel engineer Alan Maguire explains how to implement a tracepoint in the Linux kernel. Here we are going to describe what tracepoints are, how they are defined and finally demonstrate the various ways they can be used. By fleshing out all of the steps, I'm hoping others may f
A first look at how Java 14’s data records will change the way you code Download a PDF of this article In this article, I’ll introduce the concept of a record in Java. Records are a new form of Java class designed to Provide a first-class means for modeling data-only aggregates Close a possible gap in Java’s type system Provide language-level syntax for a common programming pattern Reduce class bo
Follow OpenJDK on Twitter With the release of Java 9 in 2017, the Java release schedule shifted, from a major release every 3+ years to a feature release every six-months. One of the main reasons for this change was to offer developers more predictable access to continued enhancements. Feature releases now reliably occur in March and September of every year, which means developer no longer have t
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