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      1 AUTHOR = "David Sharp <dhsharp (a] google.com>"
      2 NAME = "Tracing microbenchmark"
      3 TIME = "SHORT"
      4 TEST_CATEGORY = "Benchmark"
      5 TEST_CLASS = "Kernel"
      6 TEST_TYPE = "client"
      7 
      8 DOC = """
      9 A simple benchmark of kernel tracers such as ftrace. Enables tracepoints in
     10 sys_getuid and makes 100,000 calls to getuid with tracing on and off to measure
     11 the overhead of enabling tracing. The intent for this benchmark is to not
     12 overflow the ring buffer, so the buffer is generously sized.
     13 
     14 
     15 tracer:  tracepoint enabled
     16 ------
     17 off:     n/a
     18 ftrace:  syscalls:sys_enter_getuid
     19 
     20 Args:
     21   tracer: see table above.
     22   buffer_size_kb: Set the tracing ring buffer to this size (per-cpu).
     23   calls: Set the number of calls to make to getuid.
     24 """
     25 
     26 
     27 job.run_test('tracing_microbenchmark', tracer='off', tag='off', iterations=10)
     28 job.run_test('tracing_microbenchmark', tracer='ftrace', tag='ftrace', iterations=10)
     29