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    Command:

    s390_runtime_instr

    
    
    

    SYNOPSIS

           #include <asm/runtime_instr.h>
    
           int s390_runtime_instr(int command, int signum);
    
    
    

    DESCRIPTION

           The  s390_runtime_instr()  system  call  starts  or  stops CPU run-time
           instrumentation for the calling thread.
    
           The command  argument  controls  whether  run-time  instrumentation  is
           started    (S390_RUNTIME_INSTR_START,    1)   or   stopped   (S390_RUN-
           TIME_INSTR_STOP, 2) for the calling thread.
    
           The signum argument specifies the number of a  real-time  signal.   The
           real-time  signal is sent to the thread if the run-time instrumentation
           buffer is full  or  if  the  run-time-instrumentation-halted  interrupt
           occurred.
    
    
    

    RETURN VALUE

           On  success,  s390_runtime_instr() returns 0 and enables the thread for
           run-time instrumentation by assigning the  thread  a  default  run-time
           instrumentation control block.  The caller can then read and modify the
           control block and start the run-time instrumentation.  On error, -1  is
           returned and errno is set to one of the error codes listed below.
    
    
    

    ERRORS

           EINVAL The  value  specified  in  command is not a valid command or the
                  value specified in signum is not a real-time signal number.
    
           ENOMEM Allocating memory for the run-time instrumentation control block
                  failed.
    
           EOPNOTSUPP
                  The run-time instrumentation facility is not available.
    
    
    

    VERSIONS

           This system call is available since Linux 3.7.
    
    
    

    CONFORMING TO

           This Linux-specific system call is available only on the s390 architec-
           ture.  The run-time instrumentation  facility  is  available  beginning
           with System z EC12.
    
    
    

    NOTES

           Glibc  does  not provide a wrapper for this system call, use syscall(2)
           to call it.
    
    
    

    SEE ALSO

           syscall(2), signal(7)
    
    
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