The logging mechanism uses per-processor buffers that are written to disk by an asynchronous writer thread. Additionally, ETW provides the ability to dynamically enable and disable logging, which makes it easy to perform detailed tracing in production environments without requiring reboots or application restarts. It uses a buffering and logging mechanism that is implemented in the kernel to provide a tracing mechanism for events that are raised by both user-mode applications and kernel-mode device drivers. To interpret the event traces, you must also understand the Windows USB host-side drivers in Windows, the official USB Specifications, and the USB Device Class Specifications.Įvent Tracing for Windows (ETW) is a general-purpose, high-speed tracing facility that is provided by the operating system. The topic assumes that you have a comprehensive understanding of the USB ecosystem and hardware that is required to successfully use the USB tracing and logging features. It includes information on how to install the tools, create trace files, and analyze the events in a USB trace file. This information is provided for the benefit of those who develop and debug USB devices. This topic provides information for client driver developers about the tracing and logging features for Universal Serial Bus (USB).
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