Microsoft Technology Licensing, LLC

Danyu Zhu

Robin Andrew Alexander

Xiaozhong Xing

Liang Yang

Vishal Jose Mannanal

HoYuen Chau

Bradley Michael Waters

Hoyuen Chau

An I/O processing system includes reception of a request to perform an I/O operation from a user-mode application, providing of the request to a storage device, scheduling of an operating system deferred procedure call to determine whether the storage device has completed the I/O operation, execution of the scheduled deferred procedure call to determine that the storage device has completed the I/O operation, and transmission of a return corresponding to the completed I/O operation to the user-mode application.

I/O completion polling for low latency storage device

An I/O processing system includes reception of a request to perform an I/O operation at a storage driver, and, in response to receiving the request, providing of the request to a storage device, and scheduling a timer associated with a callback routine to determine whether the storage device has completed the I/O operation, and, in response to expiration of the scheduled timer, determination of whether the storage device has completed the I/O operation.

Timer-based I/O completion polling for low latency storage device

Various embodiments provide an ability to schedule latency-sensitive tasks based, at least in part, upon one or more processor cores usage metrics. Some embodiments gather information associated with whether one or more processor cores are in a heavily loaded state. Alternately or additionally, some embodiments gather information identifying latency-sensitive tasks. Task(s) can be (re)assigned to different processor core(s) for execution when it has been determined that an originally assigned processor core has exceeded a usage threshold.

Latency sensitive software interrupt and thread scheduling

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Danyu Zhu