Pagefault Tracing - Pagefault Tracing - 57368

Pagefault tracing helps identify the total pagefaults caused by a thread and process.

Prerequisites

• Linux kernel 4.15 or later is required.
• From the AMDuProf installed directory, run the script AMDuProfSetup.sh with root access.

  sudo ./AMDuProfSetup.sh

If you install AMD uProf using DEB installer, the script is run by the installer and the info about eBPF (Extended Berkeley Packet Filter) support on the host and OS tracing support is provided.

Data Collection using CLI

AMDuProfCLI collect --trace osrt --osrt-event pagefault -o <output-dir> <application>

amd@uprof-ethanolx5 bin]$ ./AMDuProfCLI t --trace osrt  --osrt-event pagefault -o /tmp/ /tmp/ScimarkStable 
Profiling started 
……… 
Profiling (data collection) completed 
Generated data files path: /tmp/AMDuProf-ScimarkStable-CpuTrace_Sep-06-2024_03-38-23

Here, the generated session directory is /tmp/AMDuProf-ScimarkStable-CpuTrace_Sep-06-2024_03-38-23.

Analyze the Data Using CLI

[amd@uprof-ethanolx5 bin]$ ./AMDuProfCLI report -i /tmp/ AMDuProf-ScimarkStable-CpuTrace_Sep-06-2024_03-38-23 Translation started
…
Report generation started
…
Report generation completed...
Generated report file: /tmp/ AMDuProf-ScimarkStable-CpuTrace_Sep-06-2024_03-38-23/report.csv

An example of the pagefault report section in the .csv report file is as follows.

Figure 1. Pagefault Tracing - Pagefault Report

Limitations

• System wide data collection is not supported by pagefault tracing.
• Analyzing the 32-bit applications is not supported.
• Pagefault tracing is supported only in CLI.