2013/12/4 Greg Kroah-Hartman <gre...@linuxfoundation.org>: > How much overhead does the existing tracing code have on ARM? Is ETM > still even needed? Why not just use ETM for the core tracing code > instead?
Coresight ETM is not just faster than /sys/kernel/debug/tracing, it provides more detailed and customisable info. For instance, you can trace every load, store, instruction fetch, along with the number of cycles taken, with almost zero-overhead. > What's wrong with the in-kernel tracing logic that you can't use that > instead of the ETM stuff? ETM has a different purpose. Integrating it in /sys/kernel/debug/tracing would not take advantage of all its features. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
