US 8,510,511 B2 · Reducing interprocessor communications pursuant to updating of a storage key

Abstract

Processing within a multiprocessor computer system is facilitated by: deciding by a processor, pursuant to processing of a request to update a previous storage key to a new storage key, whether to purge the previous storage key from, or update the previous storage key in, local processor cache of the multiprocessor computer system. The deciding includes comparing a bit value(s) of one or more required components of the previous storage key to respective predefined allowed stale value(s) for the required component(s), and leaving the previous storage key in local processor cache if the bit value(s) of the required component(s) in the previous storage key equals the respective predefined allowed stale value(s) for the required component(s). By selectively leaving the previous storage key in local processor cache, interprocessor communication pursuant to processing of the request to update the previous storage key to the new storage key is minimized.

Claims18

Dependent claims

A computer system for facilitating processing of a multiprocessor computer system, the computer system comprising:

a memory;
and
a processor in communications with the memory, wherein the computer system is capable of performing a method, the method comprising:
deciding by a processor, pursuant to processing of a request to update a previous storage key to a new storage key, whether to purge the previous storage key from, or update the previous storage key in, local processor cache of the multiprocessor computer system, the deciding comprising;
comparing a bit value(s) of at least one required component of the previous storage key to a predefined allowed stale value(s) for the at least one required component;
and
leaving the previous storage key in local processor cache of the multiprocessor computer system if the bit value(s) of the at least one required component in the previous storage key equals the predefined allowed stale value(s) for the at least one required component, wherein the leaving minimizes interprocessor communication pursuant to processing of the request to update the previous storage key to the new storage key.

4 more elements

A non-transitory computer program product for facilitating processing of a multiprocessor computer system, the computer program product comprising:

a storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
deciding by a processor, pursuant to processing of a request to update a previous storage key to a new storage key, whether to purge the previous storage key from, or update the previous storage key in, local processor cache of the multiprocessor computer system, the deciding comprising:
comparing a bit value(s) of at least one required component of the previous storage key to a predefined allowed stale value(s) for the at least one required component;
and
leaving the previous storage key in local processor cache of the multiprocessor computer system if the bit value(s) of the at least one required component in the previous storage key equals the predefined allowed stale value(s) for the at least one required component, wherein the leaving minimizes interprocessor communication pursuant to processing of the request to update the previous storage key to the new storage key.

2 more elements

Dependencies are inferred from the claim text.

Reducing interprocessor communications pursuant to updating of a storage key

Life of this patent

Reducing interprocessor communications pursuant to updating of a storage key

Life of this patent

Abstract

Claims18