os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr)

openjdk7-hotspot os.hpp

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//Linux版(jdk7/hotspot/src/os/linux/vm/os_linux.cpp)
void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
  info_ptr->max_value = ALL_64_BITS;       // will not wrap in less than 64 bits
  info_ptr->may_skip_backward = false;     // elapsed time not wall time
  info_ptr->may_skip_forward = false;      // elapsed time not wall time
  info_ptr->kind = JVMTI_TIMER_TOTAL_CPU;  // user+system time is returned
}