os::current_thread_cpu_time(bool user_sys_cpu_time)
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//Linux版(jdk7/hotspot/src/os/linux/vm/os_linux.cpp) jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); } else { return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); } }