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S390_RUNTIME_INSTR(2)							    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_RUN-
       TIME_INSTR_START, 1) or stopped (S390_RUNTIME_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 instrumen-
       tation 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 architecture.  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)
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