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S390_RUNTIME_INSTR(2)         System Calls Manual        S390_RUNTIME_INSTR(2)

NAME
       s390_runtime_instr - enable/disable s390 CPU run-time instrumentation
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)
COLOPHON
       This page is part of release 3.53 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux Programmer's Manual         2012-12-17             S390_RUNTIME_INSTR(2)