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The reason for using the itimer mode is based on the requirement of perf_events support in some scenarios within the container, which makes it compatible with such scenarios through the itimer. As described in the async-profiler troubleshooting section:

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If changing the configuration is not possible, you may fall back to -e itimer profiling mode.

It is similar to CPU mode but does not require perf_events support. As a drawback, there will be no kernel stack traces.