Efficient lock hand-off in a symmetric multiprocessor system
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United States of America Patent
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Jan 13, 2015
Grant Date -
Apr 10, 2014
app pub date -
Dec 13, 2013
filing date -
Mar 21, 2012
priority date (Note) -
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Abstract
Provided are techniques for providing a first lock, corresponding to a resource, in a memory that is global to a plurality of processor; spinning, by a first thread running on a first processor of the processors, at a low hardware-thread priority on the first lock such that the first processor does not yield processor cycles to a hypervisor; spinning, by a second thread running on a second processor, on a second lock in a memory local to the second processor such that the second processor is configured to yield processor cycles to the hypervisor; acquiring the lock and the corresponding resource by the first thread; and, in response to the acquiring of the lock by the first thread, spinning, by the second thread, at the low hardware-thread priority on the first lock rather than the second lock such that the second processor does not yield processor cycles to the hypervisor.
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