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S390_RUNTIME_INSTR(2)         System Calls ManualS390_RUNTIME_INSTR(2)NAME       s390_runtime_instr - enable/disable s390 CPU run-time instrumentationSYNOPSIS       #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 in-       strumentation for the calling thread.       The command  argument  controls  whether  run-time  instrumentation  is       started  (S390_RUNTIME_INSTR_START,  1)  or  stopped  (S390_RUNTIME_IN-       STR_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  oc-       curred.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 in-       strumentation  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, usesyscall(2)       to call it.       The asm/runtime_instr.h header file is available since Linux 4.16.SEE ALSOsyscall(2),signal(7)COLOPHON       This page is part of release 5.05 of the Linux  man-pages  project.   A       description  of  the project, information about reporting bugs, and the       latest    version    of    this    page,    can     be     found     at       https://www.kernel.org/doc/man-pages/.Linux Programmer's Manual         2019-03-06S390_RUNTIME_INSTR(2)