Expediting RCU grace periods under user mode control

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United States of America Patent

PATENT NO 9348765
APP PUB NO 20140281295A1
SERIAL NO

13829788

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A technique for supporting user mode specification of Read-Copy Update (RCU) grace period latency to an operating system kernel-level RCU implementation. Non-expedited and expedited RCU grace period mechanisms are provided for invocation by RCU updaters performing RCU update operations to respectively initiate non-expedited and expedited grace periods. An expedited grace period indicator in a kernel memory space is provided for indicating whether a non-expedited RCU grace period or an expedited RCU grace period should be invoked. The non-expedited RCU grace period mechanism is adapted to check the expedited grace period indicator, and if an expedited RCU grace period is indicated, to invoke the expedited grace period mechanism. A communication mechanism is provided for use by a user mode application executing in a user memory space to manipulate the expedited grace period indicator in the kernel memory space, and thereby control whether an expedited or non-expedited RCU grace period should be used.

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Patent Owner(s)

  • INTERNATIONAL BUSINESS MACHINES CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
McKenney, Paul E Beaverton, US 146 4612

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