Pratyush Anand

117 points

New Delhi

Pratyush is working with Red Hat as a Linux Kernel Generalist. Primarily, he takes care of several kexec/kdump issues being faced by Red Hat product and upstream. He also handles other kernel debugging/tracing/performance issues around Red Hat supported ARM64 platforms. Apart from Linux Kernel, he has also contributed in upstream kexec-tools and makedumpfile project. He is an open source enthusiast and delivers volunteer lectures in educational institutes for the promotion of FOSS.

Open Minded Author

Authored Content

An intro to using eBPF to filter packets in the Linux kernel

Learn about using Extended BPF, an enhancement to the original Berkeley Packet Filter, to filter packets in the Linux kernel.

Colorful deployments: An introduction to blue-green, canary, and rolling deployments

Dynamic tracing in Linux user and kernel space

Did you forget to insert probe points in your code? No problem. Learn how to insert them dynamically with uprobe and kprobe.

Using Kdump for examining Linux Kernel crashes

Let's examine the basics of kdump usage and look at the internals of kdump/kexec kernel implementation.

Authored Comments

pratyush.anand

31 Jul 2017

Dynamic tracing in Linux user and kernel space

System tap test cases uses kprobe and uprobe. This article has talked about instrumenting kprobe and uprobe either using sysfs or using perf interface. But, these interface has a fixed callback function, and so you will see only fixed way of trace output. However, you can always write your own kernel module to have your own callback function, which will be called when traced instruction is hit. Systemtap does this. It creates a kernel module based on the user script. In future, ebpf tracing might replace systemtap.

pratyush.anand

12 Jul 2017

Dynamic tracing in Linux user and kernel space

Thanks for suggestion, will try to use some figures in next article.