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    • 32. 发明授权
    • Task switch immunized performance monitoring
    • 任务开关免疫性能监测
    • US08868886B2
    • 2014-10-21
    • US13079189
    • 2011-04-04
    • Giles R. FrazierDavid S. LevitanBrian R. Mestan
    • Giles R. FrazierDavid S. LevitanBrian R. Mestan
    • G06F11/34
    • G06F11/348G06F2201/865
    • A performance monitoring technique provides task-switch immune operation without requiring storage and retrieval of the performance monitor state when a task switch occurs. When a hypervisor signals that a task is being resumed, it provides an indication, which starts a delay timer. The delay timer is resettable in case a predetermined time period has not elapsed when the next task switch occurs. After the delay timer expires, analysis of the performance monitor measurements is resumed, which prevents an initial state or a state remaining from a previous task from corrupting the performance monitoring results. The performance monitor may be or include an execution trace unit that collects taken branches in a current trace and may use branch prediction success to determine whether to collect a predicted and taken branch instruction in a current trace or to start a new segment when the branch resolves in a non-predicted direction.
    • 性能监控技术提供任务切换免疫操作,而不需要在发生任务切换时存储和检索性能监视器状态。 当管理程序发出任务正在恢复的信号时,它提供指示,启动一个延迟定时器。 在发生下一任务切换的情况下,在没有经过预定时间段的情况下,可以将延迟定时器复位。 在延迟定时器到期后,恢复对性能监视器测量的分析,这阻止了先前任务的初始状态或状态损坏性能监视结果。 性能监视器可以是或包括执行跟踪单元,其在当前跟踪中收集所采取的分支,并且可以使用分支预测成功来确定是否在当前跟踪中收集预测和采取的分支指令,或者当分支解析时启动新分段 处于非预测方向。