babeltrace2-source.text.dmesg - Linux

Overview

The babeltrace2-source.text.dmesg command converts kernel ring buffer traces to a text format suitable for further analysis. It extracts data from the dynamic message (dmesg) buffer, which stores messages from the Linux kernel during boot and runtime. This tool facilitates the analysis of system events, errors, and other kernel-related information.

Syntax

babeltrace2-source.text.dmesg [OPTIONS] <output-file>

Options/Flags

• -l, –late-events: Capture events that occur after the trace end time.
• -e, –exclude-events: Exclude specific event types from the trace. Supports glob patterns.
• -o, –only-events: Include only specific event types in the trace. Supports glob patterns.
• -f, –filter: Apply a filter expression to the trace. Supports complex expressions.
• -M, –max-events: Limit the number of events to extract.
• -v, –verbose: Enable verbose output.

Examples

Example 1: Convert dmesg buffer to text format:

babeltrace2-source.text.dmesg my_dmesg.txt

Example 2: Filter and convert events with specific message:

babeltrace2-source.text.dmesg my_dmesg.txt -filter "msg=*error*"

Common Issues

• The command may fail if the Linux kernel does not support ring buffer tracing.
• If the output file already exists, it will be overwritten without warning.

Integration

babeltrace2-source.text.dmesg can be integrated with other tools to analyze kernel events:

• Log analyzers: Process the text output to identify errors, warnings, or other relevant information.
• Visualization tools: Generate graphs, charts, or other visual representations of the events.
• Statistical analysis: Quantify the frequency and distribution of events for profiling and system optimization.

Related Commands

• babeltrace2-source.text: General-purpose trace converter for various event sources.
• dmesg: Displays kernel ring buffer messages directly.
• perf: Performance profiling tool that can also record trace events.