Analyzer kernel-on-cpu

# Name

kernel-on-cpu - Kernel-Land on-CPU Flame Graph

This analyzer profiles CPU usage in kernel-land code execution across the entire system. It captures stack traces from kernel functions during active CPU execution, providing visibility into kernel-level operations such as system calls, interrupt handlers, and kernel threads. The analyzer generates flame graphs that visualize CPU time distribution across kernel-level function calls, helping identify performance bottlenecks in kernel code execution and system-level operations.

# Resource Category

CPU.

# Application Type & Technical Stack

• All

# Command Line Syntax

The analyzer can be invoked directly on the command-line via the orxray utility from the openresty-xray-cli software package.

Alternatively, the analyzer can also be invoked manually or automatically on the web console UI of OpenResty XRay (like on the Advanced web page).

# PID is the target process PID.
orxray analyzer run kernel-on-cpu -p PID

# trace a shell command directly
orxray analyzer run kernel-on-cpu -c SHELL_CMD

# PGID is the process group ID or any process's PID within the target process
# group.
orxray analyzer run kernel-on-cpu -p -PGID

# trace any processes started from the specified executable path.
orxray analyzer run kernel-on-cpu --exe /path/to/exe/file

# Tracing Multiple Processes

Supported.

# Output Formats

• Flame Graphs

# Author

The OpenResty Inc. Team.

# Copyright

Copyright (C) by OpenResty Inc. All rights reserved.