drgn (pronounced “dragon”) is a debugger that exposes the types and variables in a program for easy, expressive scripting in Python. The Linux kernel team at Meta originally built drgn to make it easier to investigate the kinds of difficult Linux kernel bugs that the team encounters at Meta. The team has since added further use cases for it, like...

This article was written by Lee Howes and Kenny Yu from Facebook. This is the final post in a series covering how we have used C++ coroutines at Facebook to regain stack traces for dependent chains of asynchronous waiting tasks. In previous blogs of this series, we have described how we implement async stack traces in folly, on top of C++’s...

fs-verity is a Linux filesystem feature that provides significant support for ensuring the integrity and authenticity of a read-only file in an otherwise writable filesystem. It was originally built to authenticate the contents of app package (apk) files on Android devices using ext4 and f2fs filesystems. Facebook plans to use it for authenticating...

This article was written by Lee Howes and Lewis Baker from Facebook. This is the fourth in a series of posts covering how we have used C++ coroutines at Facebook to regain stack traces for dependent chains of asynchronous waiting tasks. In the previous post we built on the basic async stack trace data structures to automatically build the linked...

This article was written by Lee Howes and Lewis Baker from Facebook. This is the third in a series of posts covering how we have used C++ coroutines at Facebook to regain stack traces for dependent chains of asynchronous waiting tasks. In the previous post in the series, we looked at the difference between synchronous and asynchronous stacks and...

This article was written by Lee Howes and Lewis Baker from Facebook. This is the second in a series of posts covering how we have used C++ coroutines at Facebook to regain stack traces for dependent chains of asynchronous waiting tasks. In the previous blog post we talked about the work we have done to implement stack traces for asynchronous...

In this blog post we introduce below, an Apache 2.0 licensed resource monitor for modern Linux systems. below was designed and developed by the resource control team at Facebook to view and record historical Linux system data. The resource control team, as the name suggests, is responsible for resource management of Linux systems at scale. ...

This article was written by Lee Howes and Lewis Baker from Facebook. Facebook’s infrastructure is highly distributed and relies heavily on asynchronous programming. Most of our services that are written in C++ are implemented using async programming frameworks like folly::Futures and folly::coro. Async programming is an important tool for scaling a...

This article was written in collaboration with Neil Mitchell, a Software Engineer in the Developer Infrastructure organization at Facebook. The Rust library Gazebo contains a collection of well-tested Rust utilities in the form of standalone modules. In this series of blog posts, we will cover some of the modules that make up the Gazebo library....