插件简介：

perf是Linux下的一款性能分析工具，能够进行函数级与指令级的热点查找。它由一个叫‘Performance counters的内核子系统实现，基于事件采样原理，以性能事件为基础，支持针对处理器相关性能指标与操作系统相关性能指标的性能剖析，可用于性能瓶颈的查找与热点代码的定位。

使用说明：

  Command-Name                   Command-Description
  config                         Get and set variables in a configuration file.
  context-switches               process context-switches detail
  page-faults                    process page-faults detail
  lock                           Analyze lock events
  ftrace                         simple wrapper for kernel's ftrace functionality
  report                         Read perf.data (created by perf record) and display the profile
  analyze                        analyze process cpu usage
  record                         Run a command and record its profile into perf.data
  sched                          Tool to trace/measure scheduler properties (latencies)
  probe                          Define new dynamic tracepoints
  script                         Read perf.data (created by perf record) and display trace output
  version                        display the version of perf binary
  list                           List all symbolic event types
  annotate                       Read perf.data (created by perf record) and display annotated code
  create-java-perf-map           generate /tmp/perf-<pid>.map files for just-in-time(JIT)-compiled methods for perf
  stat                           Run a command and gather performance counter statistics
  proc-stat                      process performance stats

支持系统：

linux