Shared Memory Queue, Adaptive pthread_mutex, and Dynamic Tracing
This blog post is also on GitHub in its entirety. If you prefer to read it there along with the code, I won’t mind. Go ahead. In one of my recent training classes, I was asked to demonstrate some...
View ArticleTwo New eBPF Tools: memleak and argdist
Warning: This post requires a bit of background. I strongly recommend Brendan Gregg’s introduction to eBPF and bcc. With that said, the post below describes two new bcc-based tools, which you can use...
View ArticleUSDT Probe Support in BPF/BCC
BPF is the next Linux tracing superpower, and its potential just keeps growing. The BCC project just merged my latest PR, which introduces USDT probe support in BPF programs. Before we look at the...
View ArticleProbing the JVM with BPF/BCC
Now that BCC has support for USDT probes, another thing I wanted to try is look at OpenJDK probes and extract some useful examples. To follow along, install a recent OpenJDK (I used 1.8) that has USDT...
View ArticleUSDT/BPF Tracing Tools: Java, Python, Ruby, Node, MySQL, PostgreSQL
A lot of high-level languages, runtimes, and libraries people use on Linux have USDT probes embedded in them. In some cases, you have to compile with a specific flag to get the probes embedded (e.g. in...
View ArticleTracing Runtime Events in .NET Core on Linux
After exploring the basic profiling story, let’s turn to ETW events. On Windows, the CLR is instrumented with a myriad of ETW events, which can be used to tackle very hard problems at runtime. Here are...
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Tracing .NET Core on Linux with USDT and BCC
In my last post, I lamented the lack of call stack support for LTTng events in .NET Core. Fortunately, being open source, this is somewhat correctable — so I set out to produce a quick-and-dirty patch...
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