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    • 7. 发明申请
    • VIRTUALIZING PRECISE EVENT BASED SAMPLING
    • 基于虚拟化精确事件的抽样
    • WO2018004894A1
    • 2018-01-04
    • PCT/US2017/034331
    • 2017-05-24
    • INTEL CORPORATION
    • MERTEN, Matthew C.STRONG, Beeman C.CHYNOWETH, Michael W.ZHOU, Grant G.KLEEN, AndreasWEIER, Kimberly C.SCHMID, Angela D.BRATANOV, StanislavABRAHAM, SethBRANDT, Jason W.YASIN, Ahmad
    • G06F9/455
    • A core includes a memory buffer and executes an instruction within a virtual machine. A processor tracer captures trace data and formats the trace data as trace data packets. An event-based sampler generates field data for a sampling record in response to occurrence of an event of a certain type as a result of execution of the instruction. The processor tracer, upon receipt of the field data: formats the field data into elements of the sampling record as a group of record packets; inserts the group of record packets between the trace data packets as a combined packet stream; and stores the combined packet stream in the memory buffer as a series of output pages. The core, when in guest profiling mode, executes a virtual machine monitor to map output pages of the memory buffer to host physical pages of main memory using multilevel page tables.
    • 一个内核包含一个内存缓冲区并执行一个虚拟机内的指令。 处理器跟踪器捕获跟踪数据并将跟踪数据格式化为跟踪数据包。 作为执行指令的结果,基于事件的采样器响应于发生特定类型的事件而生成采样记录的字段数据。 处理器跟踪器在接收到现场数据时:将现场数据格式化为采样记录的元素作为一组记录包; 在跟踪数据分组之间插入一组记录分组作为组合分组流; 并将组合的分组流作为一系列输出页面存储在存储缓冲器中。 处于guest虚拟机分析模式时,核心执行虚拟机监视器,以使用多级页面表将内存缓冲区的输出页映射到主内存的物理页面。