Method and apparatus for filtering memory write snoop...

Details Method and apparatus for filtering memory write snoop... Method and apparatus for filtering memory write snoop...

2010-02-18

2010-10-12

Patel, Hetul (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S003000, C711S133000, C711S146000, C711S148000

Reexamination Certificate

active

07814286

ABSTRACT:
A method and apparatus for filtering memory probe activity for writes in a distributed shared memory computer. In one embodiment, the method may include initiating a first store operation to a cache data block stored in a first cache from a first processing node and initiating a first load operation to said cache data block from a second processing node subsequent to initiating said first store operation; and assigning a pairwise-shared directory state to a coherence directory entry corresponding to said cache data block in response to initiating said first load operation. The method may further include initiating a second store operation to said cache data block from said second processing node subsequent to initiating said first load operation; and assigning a migratory directory state to said coherence directory entry in response to initiating said second store operation, where the migratory directory state is distinct from a modified directory state.

REFERENCES:
patent: 2009/0019230 (2009-01-01), Colglazier et al.
patent: 2009/0083498 (2009-03-01), Hansen et al.
patent: 2009/0100227 (2009-04-01), Hansen et al.

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