Intelligent SMT thread hang detect taking into account shared resource contention/blocking
US7725685B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2008 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Apr 18, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/0757
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Monitoring is performed to detect a hang condition. A timer is set to detect a hang based on a core hang limit. If a thread hangs for the duration of the core hang limit, then a core hang is detected. If the thread is performing an external memory transaction, then the timer is increased to a longer memory hang limit. If the thread is waiting for a shared resource, then the timer may be increased to the longer memory hang limit if another thread or, more particularly, the thread blocking the resource has a pending memory transaction. Responsive to detecting a hang condition, instructions dispatched to the plurality of execution units may be flushed, or the processor may be reset and restored to a previously known good, checkpointed architected state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.