Tracing off-CPU time (us) of PID 20080 by user + kernel stack for 4 secs.

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a3b0 pthread_cond_wait
    00007f362f146cc0 CHeapObj<(MemoryType)1>::operator new(unsigned long, NativeCallStack const&)
    725000796c626d65 [unknown]
    -                java (20094)
        5

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa108d805 schedule_timeout
    ffffffffa0f57662 sk_wait_data
    ffffffffa0fc1f55 tcp_recvmsg
    ffffffffa0ff179e inet_recvmsg
    ffffffffa0f5266d sock_recvmsg
    ffffffffa0f528aa SYSC_recvfrom
    ffffffffa0f53bee sys_recvfrom
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045d8cf __recv
    00007f362f5825ee Monitor::notify()
    00007f362f5c02d9 os::PlatformEvent::unpark()
    00007f362f5bca2b os::start_thread(Thread*)
    00007f36191085bc Lsun/net/spi/DefaultProxySelector$3;::run
    00007f36190004e7 call_stub
    00007f362f366435 JavaCalls::call_helper(JavaValue*, methodHandle*, JavaCallArguments*, Thread*)
    00007f360befc8c0 [unknown]
    00007f36280df800 [unknown]
    00007f3612b0a1d8 [unknown]
    00007f362f1d9f70 Metadata::is_klass() const volatile
    9090909090c3c9e5 [unknown]
    -                java (20105)
        2001472

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f362f769580 VMThread::loop()
    00007f362f769ad0 VMThread::run()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20090)
        3000259

    ffffffffa08ac461 finish_task_switch
    ffffffffa108a0a6 schedule
    ffffffffa0908fd4 futex_wait_queue_me
    ffffffffa0909c36 futex_wait
    ffffffffa090bb27 do_futex
    ffffffffa090c4b1 sys_futex
    ffffffffa108ee7b entry_SYSCALL_64_fastpath
    00007f363045a759 pthread_cond_timedwait@@GLIBC_2.3.2
    00007f362f58395e Monitor::IWait(Thread*, long)
    00007f362f583f26 Monitor::wait(bool, long, bool)
    00007f362f70a791 WatcherThread::sleep() const
    00007f362f70ac2e WatcherThread::run()
    00007f362f5c7128 java_start(Thread*)
    00007f363045470a start_thread
    -                java (20099)
        3906272