Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Reexamination Certificate
2004-04-30
2008-12-30
Tsai, Sheng-Jen (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
C711S148000, C711S153000, C711S170000, C711S171000
Reexamination Certificate
active
07472233
ABSTRACT:
Methods for dynamically allocating memory in a multiprocessor computer system such as a non-uniform memory access (NUMA) machine having distributed shared memory. The methods include allocating memory by specified node, memory class, or memory pool in response to requests by the system (kernel memory allocation) or a user (application memory allocation). Through these methods memory is allocated more efficiently in a NUMA machine. For example, allocating memory on a specified node in a NUMA machine, such as the same node on which a process requiring the memory is running, reduces memory access time. Allocating memory from a specified memory class allows device drivers with restricted DMA ranges to operate with dynamically allocated memory. Other benefits of these methods include minimizing expensive remote-memory accesses using a distributed reference count mechanism and lock-free cache access.
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Friedberg Stuart A.
Kingsbury Brent A.
Krueger Phillip E.
McKenney Paul E.
Bennett Steven Lieske
International Business Machines - Corporation
Tsai Sheng-Jen
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