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...
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 find this process a bit easier. As always it's a good idea to start with the...
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...
In this blog, Oracle Linux kernel developer Manjunath Patil demostrates how you can configure your Oracle Linux instances (both bare metal and virtual...
In this blog, Oracle Linux kernel developer Manjunath Patil demostrates how you can configure your Oracle Linux instances (both bare metal and virtual machine) running in Oracle Cloud for crash dumps. OCI instances can generate a vmcore using kdump. kdump is a mechanism to dump the 'memory contents of a system' [vmcore] when the system crashes. The vmcore later can be analyzed using the crash utility to understand the cause of the system crash. The kdump mechanism works by...
In this blog, Oracle Linux kernel developer Manjunath Patil demostrates how you can configure your Oracle Linux instances (both bare metal and virtual machine) running in Oracle Cloud for...
Oracle Linux kernel developer Daniel Jordan contributes this post on enhancing the performance of padata. padata is a generic framework for parallel jobs in the...
Oracle Linux kernel developer Daniel Jordan contributes this post on enhancing the performance of padata. padata is a generic framework for parallel jobs in the kernel -- with a twist. It not only schedules jobs on multiple CPUs but also ensures that each job is properly serialized, i.e. finishes in the order it was submitted. This post will provide some background on this somewhat obscure feature of the core kernel and cover recent efforts to enhance its parallel performance...
Oracle Linux kernel developer Daniel Jordan contributes this post on enhancing the performance of padata. padata is a generic framework for parallel jobs in the kernel -- with a twist. It not only...
Chuck Lever is a Linux Kernel Architect working with the Oracle Linux and Unbreakable Enterprise Kernel team at Oracle. He contributed this article about...
Chuck Lever is a Linux Kernel Architect working with the Oracle Linux and Unbreakable Enterprise Kernel team at Oracle. He contributed this article about replacing printk debugging with static trace points in the kernel. On The Benefits of Static Trace Points These days, kernel developers have several choices when it comes to reporting exceptional events. Among them: a console message; a static trace point; Dtrace; or, a Berkeley Packet Filter script. Arguably the best choice...
Chuck Lever is a Linux Kernel Architect working with the Oracle Linux and Unbreakable Enterprise Kernel team at Oracle. He contributed this article about replacing printk debugging with static trace...
Introduction Last year, I covered features in Linux kernel 5.0 that we thought were worth highlighting. Unbreakable Enterprise Kernel 6 is based on stable...
Introduction Last year, I covered features in Linux kernel 5.0 that we thought were worth highlighting. Unbreakable Enterprise Kernel 6 is based on stable kernel 5.4 and was recently made available as a developer preview. So, now is as good a time as any to review developments that have occurred since 5.0. While the features below are roughly in chronological order, there is no significance to the order otherwise. BPF spinlock patches BPF (Berkeley Packet Filter) spinlock...
Introduction Last year, I covered features in Linux kernel 5.0 that we thought were worth highlighting. Unbreakable Enterprise Kernel 6 is based on stable kernel 5.4 and was recently made available as...
XFS Upstream maintainer Darrick Wong provides another instalment, this time focusing on how to facilitate sysadmins in maintaining healthy filesystems. Since...
XFS Upstream maintainer Darrick Wong provides another instalment, this time focusing on how to facilitate sysadmins in maintaining healthy filesystems. Since Linux 4.17, I have been working on an online filesystem checking feature for XFS. As I mentioned in the previous update, the online fsck tool (named xfs_scrub) walks all internal filesystem metadata records. Each record is checked for obvious corruptions before being cross-referenced with all other metadata in the...
XFS Upstream maintainer Darrick Wong provides another instalment, this time focusing on how to facilitate sysadmins in maintaining healthy filesystems. Since Linux 4.17, I have been working on...
Following on from his recent blog XFS - 2019 Development Retrospective, XFS Upstream maintainer Darrick Wong dives a little deeper into the Reflinks...
Following on from his recent blog XFS - 2019 Development Retrospective, XFS Upstream maintainer Darrick Wong dives a little deeper into the Reflinks implementation for XFS in the mainline Linux Kernel. Three years ago, I introduced to XFS a new experimental "reflink" feature that enables users to share data blocks between files. With this feature, users gain the ability to make fast snapshots of VM images and directory trees; and deduplicate file data for more efficient use...
Following on from his recent blog XFS - 2019 Development Retrospective, XFS Upstream maintainer Darrick Wong dives a little deeper into the Reflinks implementation for XFS in the mainline Linux...
Darrick Wong, Upstream XFS Maintainer and kernel developer for Oracle Linux, returns to talk about what's been happening with XFS. Hi folks! It has been a...
Darrick Wong, Upstream XFS Maintainer and kernel developer for Oracle Linux, returns to talk about what's been happening with XFS. Hi folks! It has been a little under two years since my last post about upcoming XFS features in the mainline Linux kernel. In that time, the XFS development community have been hard at work fixing bugs and rolling out new features! Let's talk about the improvements that have landed recently in the mainline Linux Kernel, and our development...
Darrick Wong, Upstream XFS Maintainer and kernel developer for Oracle Linux, returns to talk about what's been happening with XFS. Hi folks! It has been a little under two years since my last...
Using Tracepoints to Debug iSCSI Modules Oracle Linux kernel developer Fred Herard offered this blog post on how to use tracepoints with iSCSI kernel modules....
Using Tracepoints to Debug iSCSI Modules Oracle Linux kernel developer Fred Herard offered this blog post on how to use tracepoints with iSCSI kernel modules. The scsi_transport_iscsi, libiscsi, libiscsi_tcp, and iscsi_tcp modules have been modified to leverage Linux Kernel Tracepoints to capture debug messages. Before this modification, debug messages for these modules were simply directed to syslog when enabled. This enhancement gives users the option to use Tracepoint...
Using Tracepoints to Debug iSCSI Modules Oracle Linux kernel developer Fred Herard offered this blog post on how to use tracepoints with iSCSI kernel modules. The scsi_transport_iscsi, libiscsi,...
