Embodiments relate to thread context restoration. One aspect is a multithreading computer system including a configuration with a core configurable between a single thread (ST) mode and a multithreading (MT) mode. The ST mode addresses a primary thread and the MT mode addresses the primary thread and one or more secondary threads on shared resources of the core. A multithreading facility is configured to control utilization of the configuration to perform a method including disabling one or more secondary threads based on switching from MT mode to ST mode. A thread context of secondary threads is made unavailable to programs. Based on a last-set program-specified maximum thread-id indicating MT, the thread context is obtained by a) executing a set MT instruction to resume the MT mode, and b) based on being in the resumed MT mode, accessing the thread context.

Claims

13 · 2 independent · depth 3

13 granted claims

›1.independentA computer system, comprising:na configuration comprising a core configurable between a single thread (ST) mode and a multithreading (MT) mode, the ST…+7

›2.↳ 1The computer system according to claim 1, wherein the set MT instruction is a signal processor instruction comprising a set MT order and a program-spe…d2

›3.↳ 1The computer system according to claim 1, further comprising saving the thread context of the one or more secondary threads based on switching to the …d2

›4.↳ 1The computer system according to claim 1, wherein the switching from the MT mode to the ST mode is based on a non-clearing reset operation, and furthe…d2+1

›6.↳ 1The computer system according to claim 1, wherein a clearing reset is performed prior to loading an operating system that does not support MT in the c…d2

›7.↳ 1The computer system according to claim 1, wherein a program that is MT-aware but does not exploit MT, issues a set-MT order with a corresponding maxim…d2

›8.↳ 1The computer system according to claim 1, wherein the last program-specified maximum thread-id is retained until a clear reset or a deactivation of th…d2

›9.independentA computer program product for thread context restoration in a configuration comprising a core configurable between a single thread (ST) mode and a mu…+4

Classifications

3 codes

IPC · International Patent Classification

Section G — Physics

G06F9/30
G06F9/38
G06F9/46

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2.3 y

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Corey S Faherty

art unit 2183 · TC 2100

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1 priority documents

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Type	Document	Date
related publication	US 20150277920 A1	1 Oct 2015

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